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Retractable Azimuth Thruster

high 309 models total

A full azimuthing propulsion pod that retracts up into the hull when not needed, giving 360-degree thrust for dynamic positioning without the drag penalty a fixed unit carries at transit speed.

Read more — Retractable Azimuth Thruster explained ▾

What makes this type

A retractable azimuth thruster is a steerable propulsion pod, mounted on a vertical strut, that can be lowered through the hull for use and winched back up into a recess when not needed. Unlike a fixed tunnel thruster, which only pushes the ship sideways, the pod rotates through 360 degrees and delivers thrust in any direction, making it suitable for dynamic positioning (DP) as well as station-keeping and low-speed manoeuvring. Retracting the unit at transit speed removes it from the flow beneath the hull, cutting the drag and cavitation noise a permanently deployed pod would generate.

Retractable azimuth thruster, cross-section
Side cross-section of a retractable azimuth thruster showing the hull well, extending column, slewing bearing, drive motor pod, shaft and propeller.

Main components

Retraction mechanism

A hydraulic or electric ram system that raises and lowers the strut within a hull well, with mechanical locks holding the unit in the retracted position during transit.

Azimuthing gearbox and strut

A right-angle drive at the top of the strut transmits power down to a lower gearbox turning the propeller shaft, while a separate slew mechanism rotates the whole pod for steering.

Propeller and nozzle

Usually a fixed-pitch propeller in a Kort nozzle, chosen for thrust efficiency at low ship speed rather than for open-water propulsion performance.

Seals and hull well

A watertight seal arrangement between the strut and the hull well is critical, since this is the joint that keeps the sea out whether the unit is deployed or stowed.

Selection / Sizing

  • Required thrust in kN, set by the vessel's DP capability plot and the environmental conditions it must hold position in.
  • Drive power, matched to whether the unit is diesel-electric or hydraulically driven from a shared power pack.
  • Retraction time and hull well depth, which affect both the general arrangement and how quickly the unit can be brought into service.
  • Redundancy requirement, since DP class notations dictate how many independent thrusters the vessel must carry.

Regulations / Class

Vessels relying on retractable azimuth thrusters for dynamic positioning are assigned a DP class notation by the classification society, which sets redundancy and failure-mode requirements for the thruster system as a whole. Class also surveys the retraction mechanism and seals on the same interval as other steering and propulsion machinery, since a seized retraction system can leave a unit stuck in the deployed position.

Typical faults

  • Seal wear at the hull well — slow ingress of water into the strut compartment, often found late because the leak rate is small.
  • Hydraulic ram failure on the retraction system — unit stuck deployed, adding drag and vibration at transit speed.
  • Slew ring or bearing wear — increased play in the azimuthing motion, degrading DP thrust accuracy.
  • Debris ingestion into the nozzle while deployed near the seabed — propeller damage or imbalance.

What to look for in a supplier

  • Documented redundancy and failure mode analysis matching the vessel's intended DP class notation.
  • Access arrangements for seal replacement without full drydocking, since this is the most frequent maintenance item.
  • Track record of the specific retraction mechanism in the sea states the vessel will actually operate in.

Cycle the retraction mechanism on a fixed schedule even when the thruster itself is not needed; a ram that has not moved in months is the one that will not move when DP operations start.

4000h
Service Interval
5 yr
Class Survey
25 yr
Typical Lifetime

Typical Manufacturers

Wartsila Schottel Brunvoll
Inspector Mode Show All 309 total

9 manufacturers · 309 models

Kongsberg

88
US-100 bow
· 100.0 kW · Retractable azimuth thruster
Power (kW)
100
Thrust (kN)
12.0
Diameter (mm)
580
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Compact size (580 mm) fits into narrow bow tunnels on medium‑size vessels
  • Retractable design eliminates drag and protects the propeller when sailing
  • High thrust‑to‑power ratio for a 100 kW unit (≈12 kN)
  • Proven Kongsberg hydraulic control system with integrated diagnostics
  • Suitable for DP0/DP1 applications where moderate maneuvering force is required
Weaknesses
  • Limited maximum thrust (12 kN) may be insufficient for large tankers or high‑power tugs
  • Retractable mechanism adds mechanical complexity and requires regular seal inspection
  • Not rated for heavy ice conditions – Arctic‑class variants are separate product lines
  • Hydraulic system maintenance can be intensive compared with electric azimuth units
Typical Vessels: Offshore supply vesselCoastal container shipFerryCruise ship (mid‑size)DP0/DP1 platform support vessel
Decision Guide: Choose if the vessel needs a compact bow thruster with retractable capability to minimise drag and operates in moderate thrust environments such as offshore supply, ferries or small cruise ships. Avoid if high thrust is required (e.g., large tankers, tugs), ice‑class operation is needed, or a fully electric azimuth system is preferred for lower maintenance.
Use Cases: The US‑100 is typically installed in the bow tunnel of medium‑size vessels to provide precise low‑speed manoeuvring during docking, undocking and dynamic positioning while at sea. Its retractable feature is valuable for ships that spend long periods underway where hull resistance must be minimised.
Manufacturer Datasheet
Datasheet
US-100 stern
· 100.0 kW · Retractable azimuth thruster
Power (kW)
100
Thrust (kN)
12.0
Diameter (mm)
580
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Compact diameter (580 mm) fits vessels with limited hull space
  • Retractable design reduces drag and protects the propeller during transit
  • Integrated 360° swivel provides excellent low‑speed maneuverability and DP support
  • Proven Kongsberg/Rolls‑Royce reliability and global service network
  • Relatively low power consumption (100 kW) suitable for vessels with limited electrical generation capacity
Weaknesses
  • Maximum thrust of 12 kN may be insufficient for large tankers or high‑power DP applications
  • Retractable mechanism adds moving parts that require regular inspection and maintenance
  • Hydraulic seal and bearing wear are critical failure points in the US series
  • Limited to moderate vessel sizes; not intended for ice‑class or heavy‑ice operations
Typical Vessels: Platform supply vessels (PSV)Offshore support / crew transfer vesselsSmall to medium bulk carriers and tankersCoastal container shipsFerries and research vessels requiring DP assistance
Certifications: DNVGL ClassificationABS Approval
Decision Guide: Choose if you need a compact, retractable azimuth thruster that provides good maneuverability for vessels up to ~30 kt service speed with modest thrust requirements and want reduced hull resistance when the unit is stowed. Avoid if your vessel requires high thrust (>15 kN), continuous full‑time operation, or ice‑class capability where a fixed tunnel or Arctic‑type thruster would be more appropriate.
Use Cases: The US‑100 is typically installed on offshore supply ships and other DP‑enabled vessels operating in temperate waters to aid station‑keeping during offshore operations, assist with tight port turns, and provide thrust when docking. Its retractable feature is valuable for vessels that spend long transits at sea where drag reduction improves fuel efficiency.
Manufacturer Datasheet
Datasheet
US-150 bow
· 150.0 kW · Retractable azimuth thruster
Power (kW)
150
Thrust (kN)
18.0
Diameter (mm)
620
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Compact design that can be fully retracted, minimizing hull resistance during cruising
  • Full 360° rotation gives excellent low‑speed maneuverability and dynamic positioning capability
  • Integrated hydraulic control system compatible with Kongsberg/ Rolls‑Royce ship automation suites
  • Relatively high thrust‑to‑power ratio for a 150 kW unit (≈18 kN)
  • Proven reliability from Kongsberg’s extensive fleet experience
Weaknesses
  • Limited maximum thrust compared with larger fixed tunnel thrusters, unsuitable for very large vessels or heavy‑load DP operations
  • Higher mechanical complexity and maintenance requirements due to retractable mechanism and hydraulic drive
  • Installation requires a dedicated hull opening and reinforcement, increasing initial fit‑out cost
  • Hydraulic system sensitivity to fluid contamination; strict maintenance regime needed
  • Performance can be affected by fouling when the unit is deployed for extended periods
Typical Vessels: Offshore supply vessels (OSV)Medium‑size product tankers (up to ~30,000 DWT)Ro‑Ro ferries and passenger vesselsContainer feeder shipsWorkboats requiring DP‑grade maneuverability
Decision Guide: Choose if you need a compact bow thruster that can be retracted to reduce cruising resistance while still providing precise low‑speed control for vessels up to ~30 kt and moderate displacement. Avoid if the vessel requires high thrust (>25 kN) for heavy DP, or if you prefer a simpler fixed tunnel thruster with lower maintenance overhead.
Use Cases: The US-150 is typically installed on offshore support ships, medium‑size tankers and ferries that operate in congested ports or need dynamic positioning for offshore operations. Its retractable feature is valuable for vessels that spend long periods underway at speed, as it eliminates the drag penalty of a permanently exposed thruster.
Manufacturer Datasheet
Datasheet
Kongsberg/Rolls-Royce US-150 stern
US-150 stern
· 150.0 kW · Retractable azimuth thruster
Power (kW)
150
Thrust (kN)
18.0
Diameter (mm)
620
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Compact size with 620 mm propeller allows installation on vessels with limited draft or tunnel space.
  • Retractable design protects the unit from fouling and impact when sailing, reducing drag and maintenance.
  • Full 360° swivel provides excellent maneuverability for dynamic positioning and tight‑berth operations.
  • Integrated hydraulic drive offers high torque at low speeds, matching the 150 kW power rating efficiently.
  • Kongsberg’s proven control system integrates easily with standard DP consoles.
Weaknesses
  • Maximum thrust (18 kN) may be insufficient for large tankers or vessels requiring high bollard‑pull.
  • Hydraulic components add complexity and require regular fluid monitoring and leak checks.
  • Retractable mechanism introduces additional moving parts that can wear, increasing inspection intervals.
  • Limited to moderate power range; not suitable for ice‑class or extreme‑environment applications without a dedicated Arctic variant.
Typical Vessels: Offshore supply vesselPlatform support vesselFerrySmall container ship (≤30 000 dwt)Cruise ship maneuvering thruster
Certifications: IMO Type ApprovalDNV GL Class approval
Decision Guide: Choose the US‑150 when a vessel needs moderate thrust, high manoeuvrability and the ability to retract the unit for reduced drag or protection in shallow waters. It is ideal for DP‑enabled offshore workboats and medium‑size ferries. Avoid it on very large carriers, ice‑class ships, or any application demanding higher thrust than 18 kN.
Use Cases: The US‑150 is commonly installed on offshore supply vessels for station‑keeping during subsea operations, on ferries for rapid docking and undocking, and on small cruise ships to assist with tight port manoeuvres. Its retractable feature also makes it popular on vessels that spend long periods underway where drag reduction is valuable.
Manufacturer Datasheet
Datasheet
US-200 bow
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
24.0
Diameter (mm)
660
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Retractable design eliminates drag during transit, improving fuel efficiency.
  • Full 360° rotation gives excellent low‑speed maneuverability and DP1 capability.
  • Compact size (660 mm) fits vessels with limited hull space in the bow area.
  • Kongsberg’s double‑gear hydraulic drive provides reliable power transmission and easy integration with existing ship systems.
  • Proven Kongsberg/ Rolls‑Royce heritage with extensive field service support.
Weaknesses
  • Maximum thrust (24 kN) may be insufficient for high‑power tug or ice‑class applications.
  • Retractable mechanism adds mechanical complexity and requires regular inspection of seals and hydraulic actuators.
  • Hydraulic power unit must be sized to meet the 200 kW demand, increasing system weight and space requirements.
  • Not rated for extreme Arctic conditions; a dedicated ARC version would be required for ice operations.
Typical Vessels: Offshore Supply Vessel (OSV)Platform Supply Vessel (PSV)Multipurpose / DP‑1 vesselCruise ferryContainer feeder
Certifications: DNV GL class approvalIMO Type ApprovalUSCG Type Approval
Decision Guide: Choose if the ship needs a compact bow thruster that can be retracted to save fuel, requires moderate thrust (≈24 kN) and precise maneuvering for DP‑1 or harbor operations. Avoid if the vessel demands higher thrust levels, operates in ice or extreme Arctic environments, or prefers an all‑electric drive without hydraulic infrastructure.
Use Cases: Commonly installed on offshore support vessels for dynamic positioning, wind‑farm installation ships for station‑keeping, cruise ferries for rapid docking, and container feeders that need tight maneuverability in congested ports while maintaining low transit resistance.
Manufacturer Datasheet
Datasheet
US-200 stern
· 200.0 kW · Retractable azimuth thruster
Power (kW)
200
Thrust (kN)
24.0
Diameter (mm)
660
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Full 360° thrust vectoring provides excellent low‑speed manoeuvrability and dynamic positioning capability.
  • Retractable design reduces hull resistance when the unit is stowed, improving fuel efficiency during cruise.
  • Compact size (660 mm diameter) fits vessels with limited stern space or shallow draft.
  • Hydraulic drive system offers proven reliability and easy integration with existing ship control systems.
  • Kongsberg’s global support network ensures spare‑parts availability and technical assistance.
Weaknesses
  • Maximum thrust (24 kN) is lower than larger fixed tunnel thrusters, limiting use on very large vessels requiring high bollard pull.
  • Retractable mechanism adds mechanical complexity, leading to higher inspection and maintenance workload.
  • Seal and bearing wear are critical failure points; regular monitoring of propeller‑shaft seals and bearing play is required.
  • Hydraulic system can be sensitive to fluid contamination, necessitating strict filtration regimes.
Typical Vessels: Offshore supply vesselDynamic positioning (DP) support shipCruise ferryMedium‑size container feederLNG carrier with limited stern space
Certifications: IMO Type Approval (D‑2)DNV Class Notation
Decision Guide: Choose if you need high manoeuvrability and the ability to retract the thruster for cruising efficiency on vessels with restricted stern volume. Avoid if your vessel requires very high thrust levels, minimal maintenance complexity, or operates in extreme ice conditions where a dedicated Arctic thruster is required.
Use Cases: The US‑200 is commonly installed on offshore support ships that perform frequent close‑quarter manoeuvres and dynamic positioning tasks, as well as on cruise ferries where reduced drag during transit is valuable. It is also used on medium‑size container feeders to aid in port entry/exit while keeping hull resistance low when the thruster is retracted.
Manufacturer Datasheet
Datasheet
US-250 bow
· 250.0 kW · Retractable azimuth thruster
Power (kW)
250
Thrust (kN)
30.0
Diameter (mm)
700
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Retractable design frees hull volume and reduces draft, useful for vessels with limited under‑keel clearance.
  • Full 360° thrust vectoring provides excellent low‑speed manoeuvring and dynamic positioning capability.
  • Compact 700 mm diameter suits medium‑size ships while still delivering a high thrust‑to‑power ratio (≈30 kN at 250 kW).
  • Kongsberg’s proven control electronics integrate easily with most DP systems.
Weaknesses
  • Mechanical retract/extend mechanism adds complexity and requires regular inspection of seals and hydraulic actuation.
  • Maximum thrust is limited compared with larger fixed‑pitch tunnel thrusters, making it unsuitable for very large vessels or high‑wind conditions.
  • Maintenance access can be more demanding when the unit is retracted inside the hull.
  • Potential for water ingress if shaft seals deteriorate; requires vigilant seal monitoring.
Typical Vessels: Offshore supply vesselMedium‑size container feederCruise ship (bow thruster)FerryLNG carrier (mid‑size)
Decision Guide: Choose if: you need a high‑maneuverability bow thruster on a vessel with limited hull space, require DP capability, and operate in ports where draft is critical. Avoid if: the ship demands thrust well above 30 kN, operates in heavy ice conditions without an Arctic‑thruster variant, or you prefer a lower‑maintenance fixed tunnel thruster.
Use Cases: The US‑250 is typically installed on offshore support ships for precise station‑keeping during ROV operations, on cruise liners to aid docking in congested harbours, and on medium‑size container feeders to reduce berthing time in tight terminals. Its retractable feature also makes it attractive for retrofits where hull penetration must be minimized.
Manufacturer Datasheet
Datasheet
Kongsberg/Rolls-Royce US-250 stern
US-250 stern
· 250.0 kW · hydraulic retractable azimuth thruster
Power (kW)
250
Thrust (kN)
30.0
Diameter (mm)
700
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Full 360° rotation provides excellent low‑speed manoeuvrability and DP capability.
  • Retractable design reduces hull resistance and protects the unit when not in use.
  • Compact 700 mm propeller diameter fits vessels with limited beam or draft.
  • Integrated hydraulic drive simplifies installation on existing shaft lines.
  • Kongsberg’s proven reliability and global support network.
Weaknesses
  • Maximum thrust (≈30 kN) may be insufficient for very large DP‑required ships.
  • Hydraulic system adds maintenance workload and risk of fluid leaks.
  • Retractable mechanism introduces additional moving parts that can fail.
  • Higher noise and vibration compared with newer permanent‑magnet electric units.
  • Weight of the unit can affect payload margins on smaller vessels.
Typical Vessels: Offshore supply vesselPlatform support vesselCruise ship (mid‑size)Container feederLNG carrier (up to 30 kt)
Certifications: DNV
Decision Guide: Choose if you need high manoeuvrability, DP capability and want drag reduction when the thruster is not in use. Avoid on vessels that require higher thrust levels or where a fully electric, low‑noise solution is preferred.
Use Cases: Commonly installed on offshore support ships for dynamic positioning during drilling operations, cruise liners for precise docking, and container feeders to aid berthing in tight ports. The retractable feature is valuable for vessels that spend long periods cruising without thruster use.
Manufacturer Datasheet
Datasheet
US-300 bow
· 300.0 kW · Retractable azimuth thruster
Power (kW)
300
Thrust (kN)
36.0
Diameter (mm)
740
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (36 kN at 300 kW) for precise low‑speed manoeuvring
  • Retractable design eliminates hull resistance and protects the unit during transit
  • Compact 740 mm diameter suitable for vessels with limited hull space
  • Full 360° azimuth capability enables dynamic positioning and tight docking
  • Kongsberg’s proven hydraulic control system offers reliable response
Weaknesses
  • Maximum power of 300 kW may be insufficient for large DP‑required ships
  • Retractable mechanism adds mechanical complexity and maintenance workload
  • Seal and O‑ring wear in the retractable housing can lead to leaks if not inspected regularly
  • Higher upfront cost compared with fixed tunnel thrusters of similar thrust
  • Limited thrust envelope (36 kN) for vessels requiring very high bollard pull
Typical Vessels: Offshore Supply VesselContainer FeederCruise Ship (mid‑size)FerrySmall LNG Carrier
Decision Guide: Choose the US‑300 when a vessel needs high manoeuvrability with a compact bow thruster that can be retracted to reduce drag and improve fuel efficiency, especially on ships with limited hull space or DP‑2 requirements up to ~300 kW. Avoid it for very large vessels or applications demanding thrust well above 40 kN, where a fixed tunnel thruster or higher‑power azimuth unit would be more cost‑effective.
Use Cases: The US‑300 is typically installed on the bow of medium‑size offshore support ships, cruise liners and ferries to provide precise low‑speed control during port entry/exit, dynamic positioning for offshore operations, and tight docking maneuvers. Its retractable feature is valuable on vessels that spend long periods underway where drag reduction is critical.
Manufacturer Datasheet
Datasheet
US-300 stern
· 300.0 kW · Retractable Azimuth Thruster
Power (kW)
300
Thrust (kN)
36.0
Diameter (mm)
740
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (36 kN @ 300 kW) for precise maneuvering
  • Retractable design reduces hull resistance when the thruster is not in use, improving fuel efficiency
  • Compact diameter (740 mm) fits vessels with limited hull space or narrow tunnel sections
  • Proven Kongsberg/Rolls‑Royce hydraulic control system with integrated diagnostics
  • Suitable for dynamic positioning (DP) on medium‑size offshore support vessels
Weaknesses
  • Maximum power of 300 kW may be insufficient for large DP‑class ships or high‑thrust requirements
  • Retractable mechanism adds mechanical complexity and requires regular inspection of seals and hydraulic actuators
  • Higher upfront cost compared with fixed tunnel thrusters of similar rating
  • Not certified for heavy ice conditions; Arctic‑thruster variants are required for polar operations
  • Maintenance intervals can be shorter due to wear on propeller blades and shaft seals in high‑load cycles
Typical Vessels: Offshore Supply Vessel (OSV)Platform Support VesselSmall Container FeederCruise Ship (mid‑size)LNG Carrier (DP‑assisted) Research / Survey Vessel
Certifications: DNVABS
Decision Guide: Choose if you need a high‑performance, retractable stern thruster for vessels up to ~300 kW DP requirement, where reduced drag and compact installation are priorities. Avoid if the vessel operates in heavy ice, requires thrust well above 36 kN, or if budget constraints favour a simpler fixed tunnel thruster.
Use Cases: The US‑300 is typically installed on offshore support ships for dynamic positioning during drilling or wind‑farm operations, as well as on cruise and container feeders for tight harbor maneuvers. Its retractable feature allows the vessel to cruise efficiently when maneuvering assistance is not needed.
Manufacturer Datasheet
Datasheet
US-400 bow
· 400.0 kW · Retractable azimuth thruster
Power (kW)
400
Thrust (kN)
48.0
Diameter (mm)
820
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (48 kN at 400 kW) gives excellent low‑speed maneuverability for vessels up to ~30,000 dwt.
  • Retractable design preserves hull integrity and eliminates drag when the unit is stowed.
  • Compact propeller diameter (820 mm) fits narrow bow tunnels on medium‑size ships.
  • Kongsberg hydraulic control system with double‑gear pump offers precise 360° positioning and quick response.
  • Proven integration with Rolls‑Royce propulsion suites and existing ship automation platforms.
Weaknesses
  • Power limited to 400 kW; may be insufficient for very large vessels or extreme wind/current conditions.
  • Retractable mechanism adds moving parts, increasing inspection frequency and maintenance workload.
  • Seal and bearing wear can accelerate in abrasive or icy waters, requiring diligent monitoring.
  • Higher initial capital cost compared with comparable fixed tunnel thrusters.
  • Requires dedicated hydraulic supply and control cabinet space within the vessel.
Typical Vessels: Handymax bulk carrierProduct tanker (up to ~30,000 dwt)Offshore supply vesselMid‑size cruise shipContainer feeder
Decision Guide: Choose the US-400 when a compact bow thruster with high thrust is needed, hull space is limited and retractability to reduce drag is valuable, and the vessel’s maneuvering power requirement does not exceed ~400 kW. Avoid it on ships that require higher thrust levels, operate in heavy ice where an Arctic‑class thruster is mandatory, or when budget constraints favor a simpler fixed tunnel thruster.
Use Cases: Commonly installed on newbuilds for dynamic positioning and port entry/exit, especially where hull form limits the size of a fixed tunnel. Also used in retrofits to add maneuverability without sacrificing cruising efficiency, and on vessels that benefit from retractable units to lower resistance during open‑water travel.
Manufacturer Datasheet
Datasheet
US-400 stern
· 400.0 kW · Retractable azimuth thruster
Power (kW)
400
Thrust (kN)
48.0
Diameter (mm)
820
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Retractable design reduces hull resistance when not in use, improving fuel efficiency during cruising.
  • Compact tunnel size (820 mm) fits vessels with limited stern space.
  • Full 360° rotation provides excellent maneuverability and station‑keeping for DP operations.
  • High thrust‑to‑power ratio (48 kN at 400 kW) suitable for medium‑size ships.
  • Proven Kongsberg hydraulic control system with integrated monitoring.
Weaknesses
  • Hydraulic drive adds maintenance complexity and requires regular fluid inspection.
  • Retractable mechanism introduces additional moving parts that can fail if not inspected.
  • Maximum thrust may be insufficient for very large vessels or high‑speed dynamic positioning.
  • Installation demands structural modifications to accommodate the retractable tunnel.
  • Efficiency drops at higher vessel speeds compared with conventional fixed propellers.
Typical Vessels: Offshore supply vesselCruise shipFerryContainer feederLNG carrier (mid‑size)DP2/DP3 dynamic positioning vessel
Certifications: IMO Type Approval (D‑2)ABS ClassificationDNV GL Classification
Decision Guide: Choose if the ship needs high maneuverability, frequent thruster retraction to save fuel, and has limited stern space. Avoid if the vessel requires very high thrust levels, prefers an all‑electric drive, or cannot accommodate hydraulic systems and retractable tunnel structures.
Use Cases: The US-400 is typically deployed for precise station‑keeping during offshore support operations, tight harbor manoeuvring of cruise ships and ferries, dynamic positioning on drilling support vessels, and as a stern thruster to aid in berthing and unberthing where drag reduction while underway is desired.
Manufacturer Datasheet
Datasheet
US-500 bow
· 500.0 kW · Retractable azimuth thruster
Power (kW)
500
Thrust (kN)
60.0
Diameter (mm)
900
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Retractable design reduces drag and protects the unit during high‑speed transit or ice operation.
  • High thrust‑to‑power ratio (≈60 kN at 500 kW) gives excellent low‑speed maneuverability.
  • Full 360° azimuth rotation enables precise station‑keeping for DP operations and tight docking.
  • Compact 900 mm diameter fits into a wide range of vessel hull forms without excessive tunnel space.
  • Kongsberg’s proven hydraulic control system offers reliable response and integration with ship automation.
Weaknesses
  • Retractable mechanism adds mechanical complexity, increasing inspection and maintenance workload.
  • Hydraulic power unit and control electronics raise initial procurement cost versus a fixed tunnel thruster.
  • Seal and bearing wear are critical failure points; regular monitoring is required to avoid unexpected downtime.
  • Maximum 500 kW may be insufficient for larger vessels or high‑power DP requirements.
  • Installation requires precise hull integration and alignment, extending shipyard fit‑out time.
Typical Vessels: Offshore supply vesselRo‑Ro ferryMedium‑size container feederCruise ship (mid‑size)Small LNG carrier
Decision Guide: Choose the US‑500 when you need a high‑performance bow thruster that can be retracted to minimise resistance or protect against ice, and when your vessel’s power budget matches a 500 kW unit. Avoid it if capital cost, maintenance resources, or required thrust exceed what a 500 kW system can provide.
Use Cases: The US‑500 is typically installed on vessels that operate in congested ports, require dynamic positioning for offshore work, or need to transit ice‑prone waters where the thruster must be withdrawn. It is also favoured on ships where hull form optimisation benefits from a retractable unit rather than a permanent tunnel.
Manufacturer Datasheet
Datasheet
US-500 stern
· 500.0 kW · retractable azimuth thruster
Power (kW)
500
Thrust (kN)
60.0
Diameter (mm)
900
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • 500 kW motor delivering up to 60 kN thrust – strong maneuvering power for vessels up to ~30 000 gt
  • Fully retractable unit (900 mm propeller diameter) reduces hull resistance when stowed
  • 360° azimuth rotation enables precise vectoring for dynamic positioning and tight berthing
  • Kongsberg hydraulic control system with built‑in diagnostics simplifies integration and maintenance
  • Compact design fits into limited stern tunnel spaces common on cruise ships and offshore supply vessels
Weaknesses
  • Retractable mechanism adds mechanical complexity and requires more frequent seal and bearing inspections
  • Higher upfront cost compared with fixed tunnel thrusters of similar power
  • Thrust rating (60 kN) may be insufficient for large DP‑class tankers or ice‑strengthened operations
  • Requires a dedicated hydraulic power unit; integration can be space‑intensive on older vessels
  • Not certified for Arctic/ice class applications (unlike Kongsberg ARC line)
Typical Vessels: Cruise shipOffshore supply vesselLNG carrier (mid‑size)Container feederDynamic positioning support vessel
Decision Guide: Choose if you need high maneuverability, DP capability or tight berthing on a vessel with limited stern space and can accommodate the hydraulic system; avoid if the ship operates in ice conditions, requires very high thrust, or budget constraints preclude the higher cost of a retractable unit.
Use Cases: The US‑500 is commonly installed as a stern thruster on cruise ships for docking assistance, on offshore supply vessels to provide DP hold‑positioning while conducting subsea operations, and on mid‑size LNG carriers to aid in berth approach where hull space is at a premium.
Manufacturer Datasheet
Datasheet
US-600 bow
· 600.0 kW · Retractable azimuth thruster
Power (kW)
600
Thrust (kN)
72.0
Diameter (mm)
980
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (72 kN @ 600 kW) for strong maneuvering capability
  • Retractable design reduces hydrodynamic resistance and fuel consumption when the thruster is not needed
  • Compact 980 mm propeller diameter fits vessels with limited hull space
  • Proven Kongsberg/Rolls‑Royce hydraulic control system with extensive field support
  • Standardised inspection points simplify scheduled maintenance
Weaknesses
  • Hydraulic power unit adds complexity and requires regular oil quality monitoring
  • Retractable mechanism introduces moving parts that need periodic over‑haul (typically every 5 years)
  • Maximum thrust is lower than larger fixed tunnel thrusters of the same class, limiting use on very large vessels
  • Installation cost is higher due to retraction housing and sealing requirements
  • Dependence on hydraulic fluid means potential for leaks if seals deteriorate
Typical Vessels: Container shipCruise linerRo‑Ro ferryOffshore support vessel (OSV)LNG carrier
Certifications: DNV GL class approvalABS classification
Decision Guide: Choose the US‑600 when a vessel needs strong bow maneuverability, benefits from reduced drag during cruise, and has sufficient hull volume for a retractable unit. It is especially suitable for dynamic positioning or tight port operations on medium‑to‑large ships. Avoid if budget constraints favour simpler fixed tunnel thrusters, if the vessel’s power plant cannot support a 600 kW hydraulic system, or when ultra‑low maintenance electric thrusters are preferred.
Use Cases: The US‑600 is commonly installed on offshore supply vessels and large passenger ferries to provide precise low‑speed positioning during offshore operations or port docking. It is also used on container and LNG carriers for bow‑side thrust assistance in confined waterways, where the ability to retract the unit improves overall fuel efficiency.
Manufacturer Datasheet
Datasheet
US-600 stern
· 600.0 kW · Retractable azimuth thruster
Power (kW)
600
Thrust (kN)
72.0
Diameter (mm)
980
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (72 kN at 600 kW) for precise ship handling
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency
  • 360° swivel provides excellent manoeuvrability for dynamic positioning and tight berthing
  • Compact footprint fits vessels with limited hull space aft
  • Kongsberg’s proven hydraulic drive system offers reliable performance in harsh marine environments
Weaknesses
  • Maximum power of 600 kW may be insufficient for very large or heavily loaded vessels requiring higher bollard‑pull
  • Retractable mechanism adds mechanical complexity and requires regular inspection of seals, hydraulics and guide rails
  • Higher upfront cost compared with fixed tunnel thrusters of similar rating
  • Maintenance intervals can be shorter due to wear on retractable bearings and O‑rings
  • Limited availability of spare parts in remote ports relative to more common fixed‑type thrusters
Typical Vessels: Offshore supply vessels (OSV)Dynamic positioning (DP) workboatsCruise ships and ferries needing tight port manoeuvringLNG carriers with restricted aft spaceContainer or bulk carriers equipped for DP‑assisted operations
Decision Guide: Choose the US‑600 when you need a high‑thrust, 360° azimuth thruster that can be retracted to minimise drag and you have sufficient maintenance capability for its retractable system. Avoid it on vessels requiring power above 600 kW, where simplicity and lower life‑cycle cost of a fixed tunnel thruster are more important.
Use Cases: The US‑600 is typically installed on DP‑class offshore support ships, cruise liners, and ferries that operate in congested ports or need precise station‑keeping. Its retractable feature is valued on vessels where aft hull form must remain streamlined for cruising efficiency while still providing strong low‑speed manoeuvring capability when required.
Manufacturer Datasheet
Datasheet
US-750 bow
· 750.0 kW · Retractable azimuth thruster
Power (kW)
750
Thrust (kN)
90.0
Diameter (mm)
1100
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑size ratio (750 kW for a 1.1 m diameter unit) gives strong maneuvering capability.
  • Retractable design eliminates tunnel resistance during transit, improving fuel efficiency.
  • Full 360° rotation enables precise thrust allocation for dynamic positioning and tight berthing.
  • Proven Kongsberg/ Rolls‑Royce brand with extensive field service network.
  • Hydraulic drive provides robust torque delivery and is compatible with existing ship hydraulic systems.
Weaknesses
  • Large tunnel diameter (≈1.1 m) requires significant hull space and structural reinforcement.
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power.
  • Complex retractable mechanism adds maintenance tasks (seal wear, hydraulic line integrity).
  • Hydraulic system can be less energy‑efficient than newer permanent‑magnet electric variants.
  • Not rated for ice operations; an Arctic Thruster variant would be required for polar service.
Typical Vessels: Offshore supply & DP vesselsCruise shipsLNG carriersContainer ships (large box‑ships)Very large crude carriers (VLCC) with advanced maneuvering needs
Certifications: IMO Type ApprovalDNV GL Class approval
Decision Guide: Choose the US‑750 when you need high bow thrust for DP or tight port manoeuvring and want drag reduction during cruising via retraction. It is ideal for vessels that can accommodate a 1.1 m tunnel and have an existing hydraulic infrastructure. Avoid if hull space is limited, budget constraints preclude the higher purchase price, or the vessel operates regularly in ice where an Arctic‑class thruster is required.
Use Cases: The US‑750 is typically installed on offshore support vessels to maintain position during subsea operations, on cruise ships for precise docking in congested ports, and on large cargo carriers that require strong bow thrust for berthing while benefiting from reduced resistance when the unit is retracted during open‑water sailing.
Manufacturer Datasheet
Datasheet
US-750 stern
· 750.0 kW · Hydraulic retractable azimuth thruster
Power (kW)
750
Thrust (kN)
90.0
Diameter (mm)
1100
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (90 kN at 750 kW) for precise low‑speed manoeuvring
  • Retractable design reduces drag and protects the propeller when not in use
  • Compact 1.1 m diameter fits vessels with limited hull space
  • Proven Kongsberg reliability and extensive global support network
  • Standardised hydraulic control system simplifies integration on DP‑enabled ships
Weaknesses
  • Requires a dedicated high‑pressure hydraulic system, adding weight and maintenance effort
  • Retractable mechanism introduces additional moving parts that can wear over time
  • Maximum thrust may be insufficient for very large vessels or extreme ice conditions
  • Installation demands structural reinforcement in the stern tube area
  • Higher capital cost compared with fixed tunnel thrusters of similar power
Typical Vessels: Offshore supply and platform support vesselsDynamic positioning (DP2/DP3) shipsCruise ships and ferriesMid‑size LNG carriersContainer feeders and Ro‑Ro vessels requiring tight manoeuvring
Certifications: DNV GL Type ApprovalIMO Type Approval (Resolution MSC.267(84))
Decision Guide: Choose if you need a high‑thrust, space‑efficient stern thruster with the ability to retract for reduced drag and DP operation. Avoid if your vessel does not require retractability, prefers an all‑electric solution, or demands thrust levels beyond 90 kN.
Use Cases: The US‑750 is commonly installed on offshore support vessels that perform frequent close‑quarter manoeuvres near rigs, on cruise ships for port docking and tight berthing, and on DP‑enabled carriers where rapid directional control and drag reduction are critical during transit and while at anchor.
Manufacturer Datasheet
Datasheet
US-800 bow
· 800.0 kW · Retractable azimuth thruster
Power (kW)
800
Thrust (kN)
96.0
Diameter (mm)
1140
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (96 kN at 800 kW) suitable for medium‑size vessels
  • Retractable design eliminates hydrodynamic resistance during transit, improving fuel efficiency
  • Full 360° rotation provides excellent low‑speed manoeuvring and DP capability
  • Compact 1.14 m propeller diameter fits into tighter hull spaces compared with larger tunnel thrusters
  • Proven Kongsberg/Rolls‑Royce reliability and extensive global support network
Weaknesses
  • Hydraulic drive system adds complexity, requiring regular fluid monitoring and filter changes
  • Maintenance intensive – wear points include propeller blades, shaft seals, bearings and hydraulic lines
  • Hull penetration and structural reinforcement are required for the retractable mechanism
  • Not optimised for extreme ice conditions; Arctic‑class thrusters are a separate product line
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power
Typical Vessels: Offshore supply vessels (OSV)Dynamic positioning vessels (DP2/DP3)Cruise ships and ferries requiring precise dockingContainer ships and bulk carriers in restricted portsLNG/LPG carriers with bow‑thruster assisted manoeuvring
Certifications: DNV Class approvalIMO Type Approval
Decision Guide: Choose the US‑800 when you need a high‑thrust, retractable bow thruster for vessels that operate frequently in confined waters or require DP capability and want to minimise drag during open‑water sailing. Avoid it on ice‑class ships, ultra‑large vessels where a fixed tunnel thruster is more cost‑effective, or when you prefer an all‑electric permanent‑magnet solution for maximum energy efficiency.
Use Cases: The US‑800 is typically installed on offshore support and DP vessels to provide precise station‑keeping during drilling or subsea operations, on cruise ships for tight port turns, and on container or bulk carriers that need strong bow thrust for berthing in congested terminals while still benefiting from reduced resistance when cruising.
Manufacturer Datasheet
Datasheet
US-800 stern
· 800.0 kW · Retractable azimuth thruster
Power (kW)
800
Thrust (kN)
96.0
Diameter (mm)
1140
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (96 kN at 800 kW)
  • Retractable design reduces hull resistance during transit
  • Full 360° swivel provides excellent maneuverability and DP capability
  • Compact diameter (1.14 m) fits in medium‑size vessels
  • Proven Kongsberg/Rolls‑Royce reliability and support network
Weaknesses
  • Retractable mechanism adds mechanical complexity and maintenance requirements
  • Higher upfront cost compared with fixed tunnel thrusters of similar power
  • Requires dedicated hydraulic power unit and control integration
  • Limited to stern installations where hull geometry permits retraction
  • Seal and bearing wear must be closely monitored in harsh marine environments
Typical Vessels: Offshore Support Vessel (OSV)Anchor Handling Tug Supply (AHTS) shipDynamic Positioning vessel (DP2/DP3)Cruise ship with tight port manoeuvring needsLNG carrier or large tanker requiring bow‑to‑stern thrust balance
Certifications: DNVABS
Decision Guide: Choose if the vessel needs high bollard pull, DP capability and wants drag reduction when thruster is not in use. Avoid if budget constraints favour a simpler fixed tunnel thruster or if hull design cannot accommodate the retractable unit.
Use Cases: The US‑800 is typically installed on offshore vessels for station‑keeping during drilling or wind‑farm installation, on cruise ships for precise docking in confined ports, and on tankers where reduced transit resistance improves fuel efficiency while still providing strong low‑speed manoeuvring.
Manufacturer Datasheet
Datasheet
US-1000 bow
· 1000.0 kW · Retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
120.0
Diameter (mm)
1300
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈120 kN at 1 MW) for excellent low‑speed manoeuvring
  • Retractable design reduces hydrodynamic resistance during cruise, improving fuel efficiency
  • Full 360° rotation provides precise vectoring for dynamic positioning and tight port turns
  • Compact 1300 mm propeller diameter fits in limited bow tunnel spaces
  • Kongsberg/ Rolls‑Royce heritage ensures proven reliability and global support
Weaknesses
  • Hydraulic drive system adds complexity, requiring regular oil quality checks and seal maintenance
  • Retract/extend mechanism introduces additional wear points (seal, bearing) that must be inspected frequently
  • Maximum thrust lower than larger fixed‑pitch tunnel thrusters of comparable power
  • Higher upfront capital cost versus simpler conventional bow thrusters
  • Space required for retraction housing may limit internal layout in smaller vessels
Typical Vessels: Offshore support vessel (OSV)Dynamic positioning vessel (DP2/DP3)Cruise shipContainer ship with high maneuverability needsLarge tanker or bulk carrier requiring bow assistance
Decision Guide: Choose if you need a powerful, 360° steerable thruster that can be stowed to reduce cruise resistance – ideal for vessels with dynamic positioning, tight port constraints, or high‑value manoeuvring requirements. Avoid if budget is limited, the vessel lacks space for the retraction housing, or an all‑electric low‑maintenance solution is preferred.
Use Cases: The US‑1000 is typically installed on the bow of offshore supply ships and DP vessels to provide precise lateral thrust during station‑keeping, berthing, and unberthing. Its retractable feature is exploited on long voyages where drag reduction improves fuel consumption, while still offering full thrust for emergency manoeuvres or ice‑class assistance when deployed.
Manufacturer Datasheet
Datasheet
US-1000 stern
· 1000.0 kW · Retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
120.0
Diameter (mm)
1300
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈120 kN at 1 000 kW) for strong low‑speed manoeuvring
  • Retractable design reduces drag and protects the unit when cruising, improving fuel efficiency
  • Full 360° rotation provides excellent bow‑/stern‑side control for DP or close‑quarter operations
  • Compact propeller diameter (1.3 m) fits vessels with limited hull space
  • Kongsberg’s proven hydraulic control system and extensive service network
Weaknesses
  • Complex retractable mechanism adds installation cost and requires regular inspection of seals and hydraulics
  • Hydraulic system maintenance is intensive (oil quality, line integrity, seal wear)
  • Limited thrust compared with larger fixed‑pitch azimuth units for very high‑power vessels
  • Hull penetration for the retraction shaft can be a source of leakage if not properly maintained
  • Spare parts and overhaul intervals are relatively costly
Typical Vessels: Offshore supply vesselDP2/DP3 platform support shipCruise ship (stern maneuvering)Container feederLNG carrier with dynamic positioning
Decision Guide: Choose if the vessel needs high‑power, 360° thrust in a confined stern space and benefits from being able to retract the unit for cruising efficiency (e.g., DP‑enabled offshore vessels). Avoid if budget constraints limit maintenance capability or if the ship requires higher absolute thrust than 120 kN at 1 MW.
Use Cases: The US‑1000 is typically installed on offshore support ships that perform dynamic positioning, tug assistance, and tight‑harbour manoeuvring. Its retractable feature is valuable for vessels that spend long periods underway at speed but still need strong low‑speed thrust for station‑keeping or port entry.
Manufacturer Datasheet
Datasheet
US-1200 bow
· 1200.0 kW · Retractable azimuth thruster
Power (kW)
1200
Thrust (kN)
144.0
Diameter (mm)
1460
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • 1200 kW motor provides high thrust (144 kN) for fast maneuvering and DP support.
  • Retractable design reduces hull resistance when the thruster is stowed, improving fuel efficiency during transit.
  • Full 360° azimuth rotation enables precise bow‑side control in tight ports and offshore operations.
  • Kongsberg’s double‑gear hydraulic drive offers proven reliability and easy integration with ship automation systems.
  • Global Kongsberg service network simplifies spare‑part logistics and technical support.
Weaknesses
  • Large propeller diameter (1.46 m) can limit installation on vessels with restricted hull space or shallow tunnels.
  • High power rating leads to increased fuel consumption if the thruster is run continuously.
  • Hydraulic drive adds system complexity and requires regular fluid quality monitoring.
  • Seal and bearing wear rates are relatively high in heavy‑load service, shortening maintenance intervals.
  • Not an Arctic‑class variant; unsuitable for ice‑infested waters without a dedicated ARC model.
Typical Vessels: Very Large Crude Carrier (VLCC)Container shipCruise shipOffshore support vesselLNG carrier
Certifications: DNVABS
Decision Guide: Choose if you need a high‑power bow thruster with retractable capability for large vessels that require strong maneuvering forces and DP assistance. Avoid on small or space‑constrained ships, in ice‑class operations, or where hydraulic system complexity is undesirable.
Use Cases: Commonly installed on ultra‑large tankers, container vessels, cruise liners and offshore support ships to provide rapid bow‑side thrust for port entry/exit, dynamic positioning, emergency stopping and tight‑water maneuvering. The retractable feature allows the thruster to be stowed during open‑sea cruising to minimise drag.
Manufacturer Datasheet
Datasheet
Kongsberg/Rolls-Royce US-1200 stern
US-1200 stern
· 1200.0 kW · Retractable azimuth thruster
Power (kW)
1200
Thrust (kN)
144.0
Diameter (mm)
1460
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power (1 200 kW) and thrust (144 kN) suitable for dynamic positioning and heavy maneuvering.
  • Retractable design reduces hull resistance, improving fuel efficiency during transit.
  • Full 360° azimuth steering gives excellent maneuverability and station‑keeping capability.
  • Integrated with Kongsberg DP control systems for seamless vessel‑wide automation.
  • Proven performance data from MegaFleet inspections (2026).
Weaknesses
  • Large tunnel diameter (1 460 mm) requires significant hull space, limiting installation on smaller vessels.
  • Retractable mechanism adds mechanical complexity and higher maintenance workload.
  • Higher capital cost compared with fixed‑pitch thrusters of similar power.
  • Complex hydraulic/electrical integration may need dedicated control room and specialist installers.
  • Spare‑parts inventory is more specialized than for standard tunnel thrusters.
Typical Vessels: Offshore Supply VesselPlatform Supply VesselAnchor Handling Tug Supply (AHTS)DrillshipFPSOLNG Carrier (DP class)Wind Farm Installation Vessel
Decision Guide: Choose if the vessel requires high thrust for DP or heavy maneuvering and can accommodate a large retractable tunnel; the ability to retract the unit for reduced drag is valuable on long transits. Avoid if hull space is limited, budget constraints preclude higher upfront cost, or the operational profile does not need 360° thrust vectoring.
Use Cases: The US‑1200 stern is typically installed on large offshore support ships and DP‑class vessels that perform station‑keeping during drilling, wind‑farm installation, or LNG loading/unloading. It is also used on FPSOs and drillships where precise positioning and the ability to retract the thruster for fuel‑efficient cruising are essential.
Manufacturer Datasheet
Datasheet
US-1500 bow
· 1500.0 kW · Retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
180.0
Diameter (mm)
1700
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (180 kN at 1 500 kW)
  • Retractable design reduces hydrodynamic resistance during cruise
  • Full 360° swivel gives excellent maneuverability for DP and close‑quarter docking
  • Compact 1.7 m diameter fits in limited bow space on many vessel types
  • Kongsberg’s proven hydraulic control system with built‑in diagnostics
Weaknesses
  • Complex hydraulic and seal arrangement increases maintenance workload
  • Retract/extend cycles accelerate wear of shaft seals and O‑rings
  • Initial capital cost higher than fixed tunnel thrusters of similar power
  • Requires dedicated retraction tunnel, consuming hull volume
  • Maximum thrust lower than larger fixed azimuth units for very large vessels
Typical Vessels: Offshore support vessel (OSV)Cruise shipContainer ship (mid‑size)LNG carrier (DP2/DP3)Multi‑purpose supply vessel
Certifications: IMO Type Approval
Decision Guide: Choose if the vessel needs high maneuverability, dynamic positioning or frequent docking in confined ports and benefits from reduced cruise resistance via retraction. Avoid if budget constraints dominate, hull space for a retraction tunnel is unavailable, or thrust requirements exceed what a 180 kN unit can provide.
Use Cases: The US‑1500 is typically installed on vessels that require precise station‑keeping – e.g., offshore wind support ships performing DP operations, cruise liners docking in tight berths, and LNG carriers needing bow thrust for safe maneuvering. Its retractable feature is especially valued on ships where fuel efficiency at sea is a priority.
Manufacturer Datasheet
Datasheet
US-1500 stern
· 1500.0 kW · Retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
180.0
Diameter (mm)
1700
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • 360° thrust vectoring for superior maneuverability and DP capability
  • Retractable design reduces hydrodynamic resistance during transit
  • High thrust‑to‑power ratio (180 kN @ 1.5 MW) in a relatively small tunnel diameter
  • Proven Kongsberg/Rolls‑Royce hydraulic control system with integrated diagnostics
  • Modular installation – can be fitted as bow or stern unit
Weaknesses
  • Complex hydraulic system increases maintenance workload and spare‑part inventory
  • Higher capital cost compared with conventional fixed tunnel thrusters of similar power
  • Retract/extend mechanism introduces additional wear points (seal, O‑rings, drive shafts)
  • Requires dedicated hull reinforcement and a retractable tunnel space
  • Maximum thrust lower than larger fixed azimuth units for the same power rating
Typical Vessels: Offshore supply & platform support vesselsDynamic positioning (DP2/DP3) shipsCruise liners and large ferriesContainer ships requiring enhanced port maneuverabilityLNG carriers with limited hull space for thrusters
Certifications: IMO Type Approval (D‑2)DNV GL Classification approvalABS classification approval
Decision Guide: Choose if the vessel needs full 360° thrust, wants drag reduction during cruising, operates in confined ports or requires DP capability. Avoid if budget is tight, maintenance resources are limited, or the design calls for maximum absolute thrust rather than compactness.
Use Cases: The US‑1500 is typically installed on offshore support vessels to provide precise station‑keeping while drilling or loading, on cruise ships for rapid docking and undocking, and on container or ferry hulls where a retractable unit saves fuel by eliminating unnecessary resistance when the thruster is not in use.
Manufacturer Datasheet
Datasheet
US-1800 bow
· 1800.0 kW · Retractable azimuth thruster
Power (kW)
1800
Thrust (kN)
216.0
Diameter (mm)
1940
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (216 kN at 1 800 kW) for rapid maneuvering and DP operations
  • Retractable design eliminates drag and protects the unit during transit, improving fuel efficiency
  • Full 360° azimuth capability provides excellent bow‑side control in tight ports
  • Compact tunnel footprint suitable for vessels with limited hull space
  • Proven Kongsberg/Rolls‑Royce hydraulic drive system with built‑in redundancy
Weaknesses
  • Complex hydraulic and retraction mechanisms increase maintenance workload and spare‑part inventory
  • Higher upfront capital cost compared with fixed tunnel thrusters of similar power
  • Seal and bearing wear are critical; failure can lead to costly dry‑dock repairs
  • Limited to bow installations on vessels that can accommodate the 1.94 m tunnel diameter
  • Retract/extend cycle time adds operational steps during port entry/exit
Typical Vessels: Very Large Crude Carriers (VLCC)Ultra‑Large Container VesselsCruise shipsLNG carriersOffshore supply & DP2 vessels
Certifications: IMO D-2
Decision Guide: Choose if the vessel requires high bow thrust for dynamic positioning, tight‑harbor maneuvering, or wants to minimise transit drag with a retractable unit. Avoid if budget constraints limit capital outlay, maintenance resources are scarce, or the ship’s hull cannot accommodate the required tunnel size.
Use Cases: The US‑1800 is typically installed on large ocean‑going ships that need strong bow assistance for DP operations, such as LNG carriers docking in confined terminals, cruise liners navigating congested ports, and offshore supply vessels performing precise station‑keeping. Its retractable feature is valued on vessels that spend long periods at sea where drag reduction translates into fuel savings.
Manufacturer Datasheet
Datasheet
US-1800 stern
· 1800.0 kW · Retractable azimuth thruster
Power (kW)
1800
Thrust (kN)
216.0
Diameter (mm)
1940
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (216 kN at 1800 kW)
  • Retractable design reduces hydrodynamic drag when not in use
  • 360° swivel provides excellent maneuverability for DP and tight berthing
  • Proven Kongsberg/Rolls‑Royce hydraulic control system with built‑in diagnostics
  • Compact diameter (1.94 m) fits a wide range of hull forms
Weaknesses
  • Complex hydraulic and retractable mechanisms increase maintenance workload
  • Higher initial capital cost compared with fixed tunnel thrusters
  • Requires internal hull space for retraction housing, limiting retro‑fit options
  • Limited to 1800 kW; may be undersized for the largest ultra‑large vessels
  • Potential for seal wear in the retractable shaft bearing, demanding regular inspection
Typical Vessels: LNG carrierCruise shipOffshore supply vesselContainer ship (mid‑size)Product tanker with DP requirements
Decision Guide: Choose if you need high thrust for stern maneuvering or dynamic positioning and want the drag‑reduction benefit of a retractable unit. Avoid if budget or maintenance resources are limited, or if vessel size exceeds the 1800 kW power envelope.
Use Cases: Commonly installed on vessels that require precise low‑speed control such as LNG carriers during berthing, cruise ships for tight port manoeuvring, offshore supply vessels with DP, and tankers needing stern thrust for safe docking while minimizing resistance during transit.
Manufacturer Datasheet
Datasheet
US-2000 bow
· 2000.0 kW · Retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
240.0
Diameter (mm)
2100
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑thrust ratio (2 MW / 240 kN) suitable for large vessels
  • Retractable design reduces hydrodynamic drag and protects the propeller during transit
  • Full 360° rotation gives excellent low‑speed maneuverability and DP support
  • Proven Kongsberg hydraulic drive with modular maintenance access
  • Standardised hull interface (2100 mm diameter) fits most new‑build bow tunnel designs
Weaknesses
  • Significant upfront cost and complex installation requiring a dedicated bow tunnel
  • Hydraulic system demands regular inspection of seals, oil quality and high‑pressure lines
  • Large physical envelope limits use on vessels with restricted hull space or low freeboard
  • Weight and retractable mechanism add to overall ship weight and centre‑of‑gravity considerations
  • Potential for seal wear in high‑cycle operation; replacement intervals can be costly
Typical Vessels: Very Large Crude Carriers (VLCC)LNG carriersCruise shipsOffshore supply vesselsContainer ships >10 000 TEU
Decision Guide: Choose if the vessel requires high thrust bow maneuvering, benefits from reduced drag during cruising, and can accommodate a dedicated bow tunnel. Avoid on small or cost‑sensitive projects where a fixed tunnel thruster would suffice.
Use Cases: The US‑2000 is commonly installed on deep‑draft tankers and cruise ships to aid port entry/exit, support dynamic positioning during offshore operations, and provide emergency thrust when docking in confined waterways. Its retractable feature also makes it attractive for vessels that spend long periods at sea where drag reduction improves fuel efficiency.
Manufacturer Datasheet
Datasheet
US-2000 stern
· 2000.0 kW · Retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
240.0
Diameter (mm)
2100
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (240 kN at 2 MW) suitable for DP‑class vessels
  • Retractable design reduces hydrodynamic resistance during transit
  • Full 360° swivel provides excellent manoeuvrability in tight ports and offshore stations
  • Integrated hydraulic control system enables rapid thrust vectoring
  • Proven Kongsberg/Rolls‑Royce reliability with extensive field service support
Weaknesses
  • Complex hydraulic and sealing arrangements increase inspection and maintenance workload
  • Higher capital cost compared with fixed tunnel thrusters of similar power
  • Requires sufficient hull space and structural reinforcement for the retraction mechanism
  • Seal wear can be accelerated in high‑temperature or abrasive environments, demanding regular monitoring
  • Weight and volume may affect vessel stability calculations on smaller platforms
Typical Vessels: Offshore supply vessels (OSV)Anchor handling tug supply (AHTS) shipsFPSOs and floating production unitsDrillships with dynamic positioningLarge LNG carriers equipped for DP operations
Certifications: DNV GL
Decision Guide: Choose if the vessel needs high‑precision manoeuvring or DP capability and can accommodate a retractable unit to gain drag reduction during cruising. Avoid if budget constraints, limited hull space, or a preference for simpler, lower‑maintenance fixed thrusters outweigh the maneuverability benefits.
Use Cases: The US‑2000 is typically installed on offshore support vessels that must hold position while loading/offloading cargo, conduct subsea interventions, or perform dynamic positioning during drilling. It is also used on FPSOs and drillships for station‑keeping in harsh sea states, and on large LNG carriers where reduced drag during long transits improves fuel efficiency.
Manufacturer Datasheet
Datasheet
US-2200 bow
· 2200.0 kW · Retractable azimuth thruster
Power (kW)
2200
Thrust (kN)
264.0
Diameter (mm)
2260
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈264 kN at 2.2 MW) enables strong bow‑side manoeuvre and DP performance.
  • Retractable design eliminates hull drag when the unit is stowed, improving fuel efficiency on long transits.
  • Full 360° rotation provides excellent lateral control for docking, undocking and close‑quarter operations.
  • Compact tunnel diameter (2 260 mm) fits within moderate‑size hull openings while still delivering high bollard pull.
  • Kongsberg’s proven hydraulic drive system offers reliable power transmission and easy integration with ship automation.
Weaknesses
  • Complex hydraulic and retraction mechanisms increase initial cost and require specialised maintenance expertise.
  • Frequent deployment/retraction cycles accelerate wear on shaft seals, O‑rings and bearing clearances.
  • Requires sufficient hull space for the retractable tunnel and associated hydraulic/electrical rooms.
  • Inspection and overhaul intervals are relatively short (typically 5 years) compared with fixed tunnel thrusters.
  • Weight and structural reinforcement needs can be significant for smaller vessels.
Typical Vessels: Offshore Supply VesselAnchor Handling Tug Supply (AHTS)Cruise ShipLarge Container ShipLNG CarrierDP‑class Tanker
Decision Guide: Choose the US‑2200 when a vessel needs high bow thrust for DP2/DP3 operations, tight port manoeuvring, or wants to minimise transit resistance with a retractable unit. Avoid if budget constraints limit capital outlay, hull space cannot accommodate the retraction tunnel, or the operator lacks the technical support for regular hydraulic and seal maintenance.
Use Cases: The US‑2200 is commonly installed on offshore support vessels that perform dynamic positioning near rigs, cruise liners docking in congested harbours, and large cargo ships requiring strong bow assistance during low‑speed manoeuvres. Its retractable feature is especially valued on vessels that spend long periods at sea where drag reduction translates into measurable fuel savings.
Manufacturer Datasheet
Datasheet
US-2200 stern
· 2200.0 kW · Retractable azimuth thruster
Power (kW)
2200
Thrust (kN)
264.0
Diameter (mm)
2260
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑thrust ratio (2200 kW / 264 kN) suitable for DP2/DP3 vessels
  • Retractable design reduces hull resistance when the thruster is not in use
  • Full 360° azimuth gives excellent manoeuvrability and station‑keeping capability
  • Proven Kongsberg/Rolls‑Royce hydraulic control system with double‑gear redundancy
  • Standardised dimensions (2 260 mm propeller diameter) fit many existing hull designs
Weaknesses
  • Complex hydraulic and retractable mechanisms increase maintenance workload
  • High power demand raises fuel consumption compared with smaller tunnel thrusters
  • Installation requires a dedicated retraction tunnel, adding to construction cost
  • Limited to stern locations due to size; not suitable for bow installations on narrow hulls
  • Not an Arctic‑rated version – ice‑class vessels may need the separate ARC line
Typical Vessels: Offshore Supply Vessel (OSV)Dynamic Positioning vessel (DP2/DP3)Drillship / FPSOAnchor Handling Tug Supply (AHTS) with DPLarge cruise ships requiring stern manoeuvring
Certifications: DNV GL class approval for DP applicationsABS classification for azimuth thrusters
Decision Guide: Choose if the vessel needs high thrust, 360° steering and wants drag reduction when the thruster is idle (e.g., DP offshore vessels). Avoid if the ship operates in ice without an Arctic‑rated version, has limited budget for hydraulic systems, or only requires modest manoeuvring where a fixed tunnel thruster would suffice.
Use Cases: The US‑2200 is typically installed on DP‑equipped offshore support ships to maintain position during drilling, ROV operations, and cargo transfers. It is also used on large cruise or tanker sterns for tight docking maneuvers and emergency stop capability, where retractability helps preserve fuel efficiency during normal cruising.
Manufacturer Datasheet
Datasheet
US-2500 bow
· 2500.0 kW · Retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
300.0
Diameter (mm)
2500
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust-to-power ratio (≈300 kN at 2 500 kW) suitable for large DP‑class ships
  • Retractable design reduces drag when not in use, improving fuel efficiency
  • 360° swivel provides excellent low‑speed maneuverability and station‑keeping
  • Proven Kongsberg/Rolls‑Royce reliability and global support network
  • Standardized hydraulic control system compatible with most ship automation suites
Weaknesses
  • Complex retractable mechanism adds installation cost and requires regular maintenance
  • Large tunnel space (≈2.5 m diameter) limits applicability on vessels with constrained hull form
  • Higher initial capital expense compared with fixed tunnel thrusters of similar power
  • Requires dedicated hydraulic power unit; integration can be challenging on older ships
Typical Vessels: VLCC / Suezmax tankersLNG carriersCruise shipsOffshore supply vessels (OSV)Container ships with DP requirements
Certifications: DNVIMO Type Approval
Decision Guide: Choose if the vessel needs high bow thrust for dynamic positioning, tight port manoeuvring, or ice‑class operations where retractability saves fuel at cruise speed. Avoid if hull space is limited, budget constraints preclude the higher upfront cost, or a lower‑power fixed thruster would meet the maneuvering requirements.
Use Cases: The US‑2500 is commonly installed on large tankers and LNG carriers that operate under DP2/DP3 regimes, cruise ships navigating congested harbours, and offshore supply vessels requiring rapid lateral thrust for station‑keeping during offshore operations. Its retractable feature is especially valued on vessels that spend most of their time at sea cruising, where drag reduction translates into measurable fuel savings.
Manufacturer Datasheet
Datasheet
US-2500 stern
· 2500.0 kW · Retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
300.0
Diameter (mm)
2500
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑thrust ratio (2.5 MW / 300 kN) suitable for large vessels requiring strong bow‑/stern‑side thrust.
  • Retractable design reduces hull resistance and protects the unit when not in use.
  • Full 360° rotation provides excellent maneuverability and DP capability.
  • Robust double‑gear hydraulic drive with built‑in redundancy improves reliability.
  • Standardised dimensions (2 500 mm propeller diameter) fit many existing hull designs.
Weaknesses
  • Large tunnel footprint may limit installation on smaller or space‑constrained hulls.
  • Higher initial capital cost and more complex hydraulic system compared with fixed tunnel thrusters.
  • Maintenance intensive – requires regular inspection of propeller blades, shaft seals and hydraulic lines.
  • Retractable mechanism adds weight and moving parts that can be prone to wear.
  • Power consumption is significant; may increase overall fuel use if operated continuously.
Typical Vessels: Very Large Crude Carrier (VLCC)Container ship (>8 000 TEU)Cruise linerLNG carrier with DP‑2 requirementsOffshore supply vessel / platform support
Decision Guide: Choose if you need high thrust for a large vessel, require DP capability, and want the drag‑reduction benefit of a retractable unit. Avoid if hull space is limited, budget constraints preclude the higher purchase/maintenance cost, or the vessel operates in low‑speed maneuvering only where a fixed tunnel thruster would suffice.
Use Cases: The US‑2500 is typically installed on deep‑draft tankers and container ships to provide stern thrust during berthing, unberthing and DP operations. It is also used on cruise ships for tight port manoeuvring and on LNG carriers to maintain position during loading while minimizing resistance when retracted.
Manufacturer Datasheet
Datasheet
US-3000 bow
· 3000.0 kW · Retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
360.0
Diameter (mm)
2900
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (360 kN at 3 MW) suitable for DP2/DP3 operations
  • Retractable design reduces hydrodynamic resistance when not in use, improving fuel efficiency
  • Full 360° rotation gives excellent manoeuvrability and station‑keeping capability
  • Integrated with Kongsberg DP control systems for seamless dynamic positioning
  • Robust hydraulic drive and proven class‑approved reliability
Weaknesses
  • Complex installation requiring a large hull tunnel and precise alignment
  • Higher capital cost compared with fixed tunnel thrusters of similar power
  • Retractable mechanism adds maintenance tasks (seal wear, actuator checks)
  • Heavier overall weight can affect vessel stability margins
  • Potential for hydraulic‑oil leakage if shaft seals are not regularly inspected
Typical Vessels: VLCC / ULCC tankerLNG carrierFPSO / offshore production unitOffshore supply & anchor handling tug supply vessel (AHTS)Large cruise ship with dynamic positioning
Certifications: DNVGL class approval
Decision Guide: Choose if the vessel requires high thrust for dynamic positioning, tight‑port manoeuvring or station‑keeping and can accommodate a retractable tunnel to gain drag reduction when cruising. Avoid if budget constraints limit upfront cost, hull space is insufficient for a large retractable unit, or the operational profile does not demand DP2/DP3 capability.
Use Cases: The US‑3000 is commonly installed on ultra‑large tankers and LNG carriers that need precise manoeuvring in confined terminals, as well as offshore support vessels that must hold position beside rigs or FPSOs. Its retractable feature is valued on ships that cruise long distances where drag reduction translates into measurable fuel savings.
Manufacturer Datasheet
Datasheet
US-3000 stern
· 3000.0 kW · Retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
360.0
Diameter (mm)
2900
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (360 kN at 3 MW) suitable for DP and tight‑berth manoeuvring
  • Retractable design eliminates hull resistance during transit, improving fuel efficiency
  • Full 360° rotation gives excellent maneuverability and station‑keeping capability
  • Proven Kongsberg/Rolls‑Royce hydraulic drive with built‑in redundancy
  • Large 2.9 m propeller diameter provides efficient cavitation‑free operation at high thrust
Weaknesses
  • Complex retractable mechanism increases installation length and hull penetration requirements
  • Higher maintenance workload compared with fixed tunnel thrusters (hydraulic seals, retraction gear)
  • Significant weight and space demand may limit suitability for smaller vessels
  • Hydraulic power unit adds to overall fuel consumption versus electric PM‑thruster alternatives
  • Potential for increased vibration if bearing play exceeds manufacturer tolerances
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS)Dynamic Positioning platform vesselsLarge tankers and bulk carriers requiring high‑power stern thrustersIce‑class support ships where retraction protects the unit
Decision Guide: Choose if you need a high‑power, retractable stern thruster for DP or tight‑berth operations and can accommodate the installation space and maintenance regime. Avoid if vessel size is limited, you prefer an all‑electric solution, or operating profiles do not justify the extra complexity of a retractable unit.
Use Cases: The US‑3000 is typically deployed on offshore support vessels that require strong thrust for dynamic positioning while transiting long distances at speed; the ability to retract the thruster reduces drag and protects it in ice or during high‑speed passages. It is also used on large tankers and bulk carriers for precise port manoeuvring where a powerful, steerable thrust source is essential.
Manufacturer Datasheet
Datasheet
US-3500 bow
· 3500.0 kW · Retractable azimuth thruster
Power (kW)
3500
Thrust (kN)
420.0
Diameter (mm)
3300
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Very high thrust (≈420 kN) suitable for dynamic positioning of large ships
  • Retractable design reduces hydrodynamic resistance when not in use
  • Proven Kongsberg/Rolls‑Royce hydraulic drive with robust sealing system
  • Full 360° rotation provides excellent maneuverability and bollard pull
  • Integrated control package compatible with most ship automation systems
Weaknesses
  • Large hull opening (≈3.3 m) requires substantial structural reinforcement
  • High power demand increases vessel fuel consumption and electrical load
  • Complex hydraulic system can raise maintenance costs and spare‑part inventory
  • Installation and commissioning are time‑intensive on existing ships
  • Not optimised for extreme ice conditions – Arctic Thruster line is required for that
Typical Vessels: VLCC / ULCC tankersLNG carriersCruise shipsLarge container vesselsOffshore supply & anchor handling tug supply (AHTS) vessels
Decision Guide: Choose if the vessel requires >400 kN of bow thrust for DP or tight‑port manoeuvring and can accommodate a retractable unit to save cruise drag. Avoid on smaller ships, budget‑constrained projects, or when ice‑class capability is mandatory – in those cases a fixed tunnel thruster or an Arctic Thruster would be more appropriate.
Use Cases: The US‑3500 is typically installed on deep‑draft tankers and LNG carriers for dynamic positioning during offshore loading/unloading, on cruise ships to aid berthing in confined ports, and on large offshore support vessels that need high bow thrust while maintaining fuel efficiency when the thruster is retracted.
Manufacturer Datasheet
Datasheet
US-3500 stern
· 3500.0 kW · Retractable azimuth thruster
Power (kW)
3500
Thrust (kN)
420.0
Diameter (mm)
3300
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈420 kN at 3.5 MW)
  • Full 360° swivel provides excellent manoeuvrability and DP performance
  • Retractable design reduces hydrodynamic resistance during transit
  • Compact footprint fits in existing stern tunnels of large vessels
  • Proven Kongsberg/Rolls‑Royce hydraulic drive with integrated control system
Weaknesses
  • Complex hydraulic and sealing systems increase maintenance workload
  • Higher capital cost compared with fixed tunnel thrusters
  • Requires reinforced hull structure at the retraction point
  • Potential for seal wear due to frequent extension/retraction cycles
  • Spare parts inventory larger than for conventional non‑retractable units
Typical Vessels: LNG carrierCruise shipOffshore supply vessel (OSV)FPSOLarge container shipProduct tanker
Decision Guide: Choose if the vessel needs high‑power DP or tight port manoeuvring and can accommodate a retractable unit to keep cruising resistance low. Avoid if budget is limited, the operating profile does not demand extreme thrust, or hull reinforcement for retraction is impractical.
Use Cases: Installed on LNG carriers for precise berthing alongside jetty arms; used on cruise ships to enable rapid docking in confined harbours while being retracted during open‑sea cruising; fitted on offshore support vessels that must hold position beside rigs in harsh weather using DP; employed on large tankers where a retractable thruster offers both manoeuvring aid and drag reduction.
Manufacturer Datasheet
Datasheet
US-4000 bow
· 4000.0 kW · Retractable azimuth thruster
Power (kW)
4000
Thrust (kN)
480.0
Diameter (mm)
3700
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈480 kN at 4 MW) suitable for large vessels requiring strong bow control.
  • Retractable design eliminates drag and protects the propeller during transit, improving fuel efficiency.
  • 360° rotation provides excellent maneuverability for DP operations and tight port entries.
  • Kongsberg’s proven hydraulic control system offers reliable response and easy integration with ship automation.
  • Standardized 3.7 m propeller diameter fits a wide range of hull forms without excessive tunnel enlargement.
Weaknesses
  • Complex retractable mechanism adds installation cost and requires regular inspection of seals, hydraulics and bearings.
  • Limited to vessels that can accommodate the required tunnel space in the bow; not suitable for very narrow hulls.
  • Maintenance intervals are shorter than fixed tunnel thrusters due to moving parts and seal wear.
  • Weight and structural reinforcement needs may be significant for older ships undergoing retrofit.
  • Performance can degrade in heavy ice unless an Arctic‑specific variant (ARC) is selected.
Typical Vessels: Very Large Crude Carriers (VLCC)LNG carriersOffshore supply vesselsCruise shipsContainer ships > 8,000 TEU
Decision Guide: Choose if the vessel needs high bow thrust for DP or tight port manoeuvring and can accommodate a retractable tunnel; the drag‑reduction when retracted also benefits fuel efficiency on long voyages. Avoid if hull space is constrained, maintenance resources are limited, or the ship operates primarily in heavy ice without an Arctic‑rated version.
Use Cases: The US‑4000 is typically installed on large tankers and offshore vessels that require strong bow control for dynamic positioning during loading/offloading, as well as cruise ships needing precise docking capability. Its retractable feature is valued on routes where cruising efficiency matters but occasional high thrust is required for maneuvering.
Manufacturer Datasheet
Datasheet
US-4000 stern
· 4000.0 kW · Retractable azimuth thruster
Power (kW)
4000
Thrust (kN)
480.0
Diameter (mm)
3700
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (480 kN at 4 MW) for excellent maneuverability and DP capability
  • Fully retractable design reduces hydrodynamic drag during transit, improving fuel efficiency
  • 360° rotation gives precise vectoring of thrust for tight port handling and emergency stopping
  • Robust double‑gear hydraulic drive with built‑in redundancy, suited to high‑power applications
  • Standard class approvals (DNV) simplify certification for new builds
Weaknesses
  • Large tunnel diameter (3.7 m) limits installation options on vessels with restricted hull space
  • Complex hydraulic system requires skilled maintenance and regular seal inspections
  • Higher capital cost compared with fixed‑pitch tunnel thrusters of similar power
  • Weight and structural reinforcement needed for the retractable mechanism increase overall ship weight
  • Long lead‑time for spare parts due to specialized Kongsberg components
Typical Vessels: Very Large Crude Carriers (VLCC)Ultra‑Large Container ShipsCruise ships (>150 000 GT)LNG carriersOffshore support vessels with DP2/DP3 requirements
Certifications: DNV GL Class Approval
Decision Guide: Choose if the vessel needs high bollard‑pull thrust, precise 360° thrust vectoring and wants drag reduction during cruising – typical for large tankers, cruise ships or DP‑enabled offshore vessels. Avoid if hull space is limited, budget constraints preclude a retractable system, or the required thrust can be met with a conventional fixed tunnel thruster.
Use Cases: The US‑4000 is commonly installed on deep‑draft tankers and cruise liners to provide dynamic positioning during offshore operations, tight berth handling in congested ports, and rapid emergency stopping. Its retractable feature is exploited on long voyages to minimise resistance, while the high thrust supports ice‑class variants for polar routes when equipped with Arctic Thruster (ARC) seals.
Manufacturer Datasheet
Datasheet
US-4500 bow
· 4500.0 kW · Retractable azimuth thruster
Power (kW)
4500
Thrust (kN)
540.0
Diameter (mm)
4100
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (540 kN at 4.5 MW) enables strong bow‑side manoeuvring even on large vessels
  • Retractable design reduces hull resistance when the unit is stowed, improving fuel efficiency
  • Full 360° azimuth rotation provides excellent maneuverability for DP and tight‑berth operations
  • Proven Kongsberg/Rolls‑Royce hydraulic control system with built‑in diagnostics
  • Large 4.1 m propeller diameter optimised for bollard‑pull performance
Weaknesses
  • Physical size (≈4.1 m diameter) limits installation to vessels with sufficient hull volume and structural reinforcement
  • Complex hydraulic system increases maintenance workload and requires specialised spare parts
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power
  • Retractable mechanism adds moving parts that are subject to wear and potential failure in harsh environments
  • Installation downtime can be longer due to integration of the retraction hydraulics into existing ship systems
Typical Vessels: Large crude oil tanker (≥150 k DWT)LNG carrierCruise shipOffshore supply vesselContainer ship with dynamic positioning requirements
Decision Guide: Choose the US‑4500 when a vessel needs high bow thrust for DP, ice‑class or tight‑berth manoeuvring and can accommodate its size and hydraulic complexity. Avoid it on smaller ships, where lower‑cost fixed tunnel thrusters suffice, or when budget constraints limit capital expenditure.
Use Cases: The US‑4500 is commonly installed on ultra‑large tankers, LNG carriers and cruise liners to provide precise station‑keeping during offshore loading/offloading, ice navigation, and port entry/exit. It is also favoured on DP‑equipped offshore supply vessels that require rapid bow‑side response.
Manufacturer Datasheet
Datasheet
US-4500 stern
· 4500.0 kW · Retractable Azimuth Thruster
Power (kW)
4500
Thrust (kN)
540.0
Diameter (mm)
4100
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Very high power and thrust (4.5 MW / 540 kN) suitable for large vessels and DP operations
  • Retractable design reduces hull resistance when the thruster is not in use
  • Full 360° azimuth steering provides excellent maneuverability and station‑keeping
  • Proven Kongsberg/ Rolls‑Royce hydraulic control system with built‑in diagnostics
  • Standardised dimensions (4100 mm propeller diameter) fit existing hull openings for many new builds
Weaknesses
  • Large physical size may require significant hull reinforcement and space allocation
  • Hydraulic drive system adds complexity, maintenance workload and potential leak points
  • Higher initial capital cost compared with conventional tunnel thrusters of similar power
  • Spare‑part logistics can be longer for the specific US‑4500 model
  • Weight (not publicly disclosed) is considerable, affecting ballast calculations
Typical Vessels: Very Large Crude Carriers (VLCC)LNG carriersCruise shipsOffshore supply vesselsDynamic positioning platform supply vessels
Decision Guide: Choose if you need maximum thrust for a large vessel, require retractable thrusters to preserve hull form and plan DP or tight‑berth manoeuvring. Avoid if the ship’s design cannot accommodate the diameter/retracting mechanism, or if lower power, simpler tunnel thrusters meet the operational profile.
Use Cases: The US‑4500 is typically installed on deep‑draft tankers, LNG carriers and offshore support ships that demand high bollard pull for berthing, emergency manoeuvring, or dynamic positioning while still benefiting from reduced drag when cruising. It is also used on cruise vessels where precise docking is required.
Manufacturer Datasheet
Datasheet
US-5000 bow
· 5000.0 kW · Retractable azimuth thruster
Power (kW)
5000
Thrust (kN)
600.0
Diameter (mm)
4500
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power (5 MW) and thrust (600 kN) suitable for large vessels and DP operations
  • Retractable design reduces hull resistance and fuel consumption during transit
  • Full 360° azimuth steering provides excellent maneuverability in tight ports
  • Integrated hydraulic control compatible with Kongsberg’s dynamic positioning systems
  • Backed by Kongsberg/Rolls‑Royce global support and proven reliability
Weaknesses
  • Large tunnel diameter (4.5 m) requires extensive hull penetration and structural reinforcement
  • High installation cost and demanding electrical/hydraulic infrastructure
  • Maintenance intensive – propeller blade wear, shaft seals and hydraulic system need regular inspection
  • Not ice‑class rated; separate Arctic Thruster line required for polar service
  • Weight and space requirements limit applicability on smaller ships
Typical Vessels: Very Large Crude Carrier (VLCC)Ultra Large Crude Carrier (ULCC)Large Container Ship (>15,000 TEU)Offshore Supply VesselFPSOLNG Carrier
Certifications: DNV
Decision Guide: Choose the US‑5000 when a large vessel needs high bow thrust for dynamic positioning or tight‑port maneuvering and can accommodate the structural size of a retractable tunnel. Avoid it on smaller ships, in ice‑class operations, or where budget constraints limit the cost of installation and ongoing maintenance.
Use Cases: The US‑5000 is typically installed on ultra‑large tankers, mega container vessels, offshore supply ships and FPSOs to provide precise station‑keeping during offshore loading/unloading, safe harbor entry/exit under DP control, and emergency maneuvering while allowing the thruster to be retracted for efficient cruising.
Manufacturer Datasheet
Datasheet
US-5000 stern
· 5000.0 kW · Retractable azimuth thruster
Power (kW)
5000
Thrust (kN)
600.0
Diameter (mm)
4500
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑thrust ratio (5 MW / 600 kN) suitable for large vessels
  • Retractable design reduces hydrodynamic resistance and protects the propeller during transit
  • Full 360° thrust vectoring provides excellent maneuverability and DP capability
  • Compact tunnel diameter (4.5 m) fits within typical stern hull spaces for mega‑vessels
  • Hydraulic drive offers proven reliability and easy integration with existing ship systems
Weaknesses
  • Complex hydraulic and sealing system increases maintenance workload
  • Higher capital cost compared with fixed tunnel thrusters of similar power
  • Requires dedicated hull recess and structural reinforcement for retraction mechanism
  • Potential for seal wear and propeller‑blade fouling in harsh environments
  • Longer installation lead‑time due to custom integration
Typical Vessels: Very Large Crude Carriers (VLCC)LNG carriersCruise shipsOffshore supply vessels (OSV)DP2/DP3 platform support vessels
Decision Guide: Choose if the vessel needs high thrust for manoeuvring or dynamic positioning and benefits from a retractable unit to lower cruising resistance. Avoid if hull space is limited, budget constraints preclude the higher purchase price, or operational profile does not require frequent use of high‑power thrusters.
Use Cases: The US‑5000 is typically installed on large tankers and offshore vessels that require strong bow‑/stern‑side thrust for port entry, tight‑water manoeuvring, and DP operations, while the retractable feature allows the unit to be stowed during open‑sea transit to improve fuel efficiency.
Manufacturer Datasheet
Datasheet
FU-100 bow
· 100.0 kW · Retractable azimuth thruster
Power (kW)
100
Thrust (kN)
12.0
Diameter (mm)
580
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Retractable design eliminates hull resistance and protects the propeller when not in use
  • Compact 580 mm tunnel diameter fits smaller hull forms and shallow‑draft vessels
  • High thrust‑to‑power ratio (12 kN @ 100 kW) for precise low‑speed maneuvering
  • Hydraulic drive provides smooth 360° thrust vectoring with proven Kongsberg control logic
  • Low installation weight compared with fixed tunnel thrusters of similar power
Weaknesses
  • Maximum thrust (12 kN) limits use on large vessels or high‑power DP applications
  • Retractable mechanism adds mechanical complexity and requires regular inspection
  • Not rated for ice or extreme abrasive environments; unsuitable for Arctic service
  • Single unit provides no redundancy – loss of the bow thruster reduces maneuverability
  • Hydraulic system maintenance (fluid quality, seals) is critical to reliability
Typical Vessels: Offshore supply vesselFerry / Ro‑RoContainer feederCoastal tankerCruise ship (mid‑size)LNG/LPG carrier (up to ~30 kt)
Decision Guide: Choose if you need a compact, low‑power bow thruster with the ability to retract for drag reduction and protection in shallow or congested waters. Avoid on vessels requiring high thrust (>15 kN), ice‑class operations, or where redundancy of multiple bow thrusters is mandatory.
Use Cases: The FU‑100 is typically installed on medium‑size commercial ships that perform frequent port turns, dynamic positioning for offshore support, and vessels operating in shallow harbours where a retractable unit minimizes hull fouling and resistance when cruising.
Manufacturer Datasheet
Datasheet
FU-100 stern
· 100.0 kW · Retractable azimuth thruster
Power (kW)
100
Thrust (kN)
12.0
Diameter (mm)
580
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Retractable design reduces hull resistance when the thruster is not in use
  • 360° swivel provides excellent maneuverability for low‑speed operations and DP assistance
  • Compact size (580 mm diameter) fits vessels with limited hull space
  • High thrust‑to‑power ratio for a 100 kW unit (≈12 kN)
  • Kongsberg’s proven reliability and global support network
Weaknesses
  • Limited absolute thrust makes it unsuitable for large tugs or high‑draft vessels
  • Mechanical retract mechanism adds complexity and maintenance requirements
  • Hydraulic drive system requires additional pumps, filters and periodic fluid checks
  • Seal and bearing wear are critical points that need regular inspection
  • Higher upfront cost compared with simple fixed tunnel thrusters of similar power
Typical Vessels: Offshore Supply Vessel (OSV)Platform Supply Vessel (PSV)Coastal tankerFerry / Ro‑Ro vesselSmall cruise or passenger ferry
Certifications: IMO Type ApprovalDNV Class
Decision Guide: Choose if you need a compact, retractable thruster that offers full 360° thrust for precise maneuvering while minimizing drag during cruising. Avoid on vessels requiring very high bollard‑pull or where simplicity and low maintenance are higher priorities than space savings.
Use Cases: Commonly installed on offshore support ships and coastal ferries to provide bow‑/stern‑side thrust for docking, undocking and dynamic positioning in confined ports; the unit is retracted during open‑water transit to improve fuel efficiency.
Manufacturer Datasheet
Datasheet
FU-150 bow
· 150.0 kW · Retractable azimuth thruster
Power (kW)
150
Thrust (kN)
18.0
Diameter (mm)
620
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Compact size and retractable design minimise hull resistance when not in use.
  • High thrust‑to‑power ratio (≈18 kN at 150 kW) for a vessel of its class.
  • Full 360° swivel provides excellent maneuverability in confined ports.
  • Kongsberg brand offers proven reliability and extensive global support network.
  • Integrated hydraulic control system compatible with most DP packages.
Weaknesses
  • Limited absolute thrust compared with larger fixed‑pitch bow thrusters; may be undersized for very large vessels or high‑wind DP operations.
  • Retractable mechanism adds moving parts, increasing inspection and maintenance workload.
  • Hydraulic system requires regular fluid quality checks to avoid seal wear.
  • Spare‑part availability can be slower in remote regions without a Kongsberg service hub.
Typical Vessels: Offshore supply vessel (OSV)Platform supply vessel (PSV)Multipurpose support shipFerry / Ro‑RoSmall to medium container feeder
Certifications: DNV
Decision Guide: Choose if: you need a compact, retractable bow thruster for vessels up to ~5 000 gt that require good low‑speed maneuverability and want to keep hull resistance low when the unit is stowed. Avoid if: the vessel demands higher thrust levels for heavy DP work, operates in extreme ice conditions, or you prefer a fixed‑pitch system with fewer moving parts.
Use Cases: The FU‑150 is typically installed on offshore support vessels that shuttle between rigs and ports, on ferries navigating tight harbor approaches, and on medium‑size cargo ships where space for a permanent bow thruster is limited but precise station‑keeping is required during loading/unloading operations.
Manufacturer Datasheet
Datasheet
FU-150 stern
· 150.0 kW · Retractable azimuth thruster
Power (kW)
150
Thrust (kN)
18.0
Diameter (mm)
620
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio for its size (18 kN at 150 kW)
  • Retractable design minimizes hydrodynamic resistance when not in use
  • Full 360° azimuth steering enhances maneuverability and DP performance
  • Compact footprint suitable for vessels with limited hull space
  • Proven Kongsberg/Rolls‑Royce reliability and global support network
Weaknesses
  • Limited maximum thrust compared with larger fixed‑pitch tunnel thrusters
  • Retractable mechanism adds mechanical complexity and requires regular inspection
  • Requires dedicated hydraulic power unit, increasing system weight and space needs
  • Potential for increased vibration if alignment or bearing wear is not monitored
  • Higher upfront cost than basic non‑retractable tunnel thrusters
Typical Vessels: Offshore supply vessel (OSV)Platform support vesselDP‑2 ferry or cruise ship tenderSmall container feederBulk carrier up to ~30 kt
Certifications: DNVABSLR
Decision Guide: Choose if you need a compact, high‑maneuverability thruster that can be retracted to reduce cruising drag on vessels requiring dynamic positioning or frequent port maneuvers. Avoid if the vessel demands higher thrust (>20 kN) for heavy bollard pull, operates in ice conditions, or seeks the lowest possible acquisition cost.
Use Cases: Commonly installed on offshore support ships for precise station‑keeping during drilling operations, on ferries for rapid docking and undocking, and on small container feeders to improve port turn‑around while allowing the thruster to be stowed during open‑water voyages.
Manufacturer Datasheet
Datasheet
FU-200 bow
· 200.0 kW · Retractable azimuth thruster
Power (kW)
200
Thrust (kN)
24.0
Diameter (mm)
660
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Retractable design reduces hull drag and protects the unit during transit
  • Compact 660 mm diameter fits vessels with limited bow space
  • High thrust‑to‑power ratio (24 kN at 200 kW) improves low‑speed maneuverability
  • Full 360° azimuth provides excellent station‑keeping for DP operations
  • Integrated hydraulic drive simplifies installation on existing hulls
Weaknesses
  • Maximum power of 200 kW limits applicability to medium‑size vessels only
  • Retractable mechanism adds mechanical complexity and maintenance workload (seals, hydraulics)
  • Thrust may be insufficient for severe wind/current conditions on larger DP tasks
  • Requires regular inspection of propeller blades, shaft seals and hydraulic system per extensive checklist
  • Efficiency lower than newer permanent‑magnet thrusters
Typical Vessels: Offshore supply vesselDP2 tugMid‑size cruise shipContainer feederRo‑Ro ferry
Certifications: IMO Type ApprovalDNV
Decision Guide: Choose the FU‑200 when a vessel needs a compact, retractable bow thruster for moderate thrust (≈24 kN) and wants reduced drag during cruising. Avoid it on large tankers, ice‑class ships or any application requiring more than ~300 kW of thruster power.
Use Cases: Commonly installed on offshore support vessels for dynamic positioning, medium‑size cruise ships for harbor docking, and container feeders where bow space is limited but precise maneuverability is required. The retractable feature allows the unit to be stowed during open‑sea passages, improving fuel efficiency.
Manufacturer Datasheet
Datasheet
FU-200 stern
· 200.0 kW · Retractable azimuth thruster
Power (kW)
200
Thrust (kN)
24.0
Diameter (mm)
660
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (24 kN at only 200 kW)
  • Retractable design reduces drag and protects the unit in ice or during transit
  • Compact 660 mm diameter fits vessels with limited hull space
  • Full 360° azimuth swing provides excellent maneuverability for DP or close‑quarter operations
  • Kongsberg/Rolls‑Royce heritage ensures proven reliability and global support
Weaknesses
  • Limited power output may be insufficient for large tankers or high‑speed vessels
  • Retractable mechanism adds mechanical complexity and maintenance workload
  • Seal and O‑ring wear can become critical in harsh, abrasive environments
  • Higher initial procurement and installation cost compared with fixed tunnel thrusters
  • Spare‑part availability may be longer for the specific retractable variant
Typical Vessels: Offshore supply vesselMedium‑size tanker (e.g., product carrier)Container feederCruise ship auxiliary maneuveringDynamic positioning platform
Decision Guide: Choose if you need a compact, high‑maneuverability thruster that can be retracted to reduce drag or protect against ice and debris, and the vessel’s power budget aligns with ~200 kW. Avoid if the ship requires higher thrust levels, prefers a simpler fixed tunnel thruster, or has strict cost constraints on installation and maintenance.
Use Cases: The FU-200 is commonly installed on the stern of offshore support vessels for precise station‑keeping, on medium product carriers to aid berthing in confined ports, and on cruise ships where reduced drag during cruising is valuable while still providing strong low‑speed maneuvering capability when needed.
Manufacturer Datasheet
Datasheet
FU-250 bow
· 250.0 kW · Retractable azimuth thruster
Power (kW)
250
Thrust (kN)
30.0
Diameter (mm)
700
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Full 360° thrust vectoring provides excellent low‑speed maneuverability and DP support.
  • Retractable design lowers hydrodynamic drag, improving fuel efficiency during transit.
  • Compact 700 mm propeller diameter fits vessels with limited hull space.
  • Kongsberg hydraulic control system offers precise positioning and proven reliability.
  • Standardised mounting (UL/ULE series) simplifies integration on new builds.
Weaknesses
  • Maximum thrust of 30 kN may be insufficient for large tankers or high‑draft vessels.
  • Retractable mechanism adds mechanical complexity and requires regular seal inspection.
  • Higher upfront cost compared with fixed tunnel thrusters of similar power.
  • Maintenance access can be limited when the unit is fully retracted.
  • Power rating (250 kW) limits use on vessels requiring higher DP‑class thrust.
Typical Vessels: Offshore supply vesselPlatform support vesselCoastal container shipCruise‑ship tenderMid‑size bulk carrier
Certifications: DNV
Decision Guide: Choose if you need a compact bow thruster with retractable capability for vessels up to ~2,000 GT where maneuverability and reduced transit drag are priorities. Avoid on high‑power DP‑required ships, ice‑class vessels, or when budget constraints favour a fixed tunnel thruster.
Use Cases: Commonly installed on offshore supply and platform support vessels for dynamic positioning, tight‑port docking, and tug‑assist operations; also used on coastal container and cruise‑tender ships to improve berth handling while allowing the unit to be stowed during open‑water cruising.
Manufacturer Datasheet
Datasheet
FU-250 stern
· 250.0 kW · Retractable azimuth thruster
Power (kW)
250
Thrust (kN)
30.0
Diameter (mm)
700
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (30 kN at 250 kW)
  • Retractable design reduces hull drag when not in use
  • Full 360° swing gives excellent maneuverability and station‑keeping
  • Compact 700 mm diameter fits vessels with limited hull space
  • Hydraulic control integrates with existing Kongsberg/Rolls‑Royce propulsion systems
Weaknesses
  • Maximum thrust lower than larger tunnel or fixed‑pitch thrusters for very large ships
  • Hydraulic system adds maintenance complexity and potential leak points
  • Retractable mechanism introduces additional moving parts that require regular inspection
  • Less redundancy compared with twin bow‑thruster arrangements
  • Not designed for ice or extreme Arctic conditions
Typical Vessels: Platform Supply Vessel (PSV)Offshore Support VesselSmall to medium TankerContainer FeederCruise Ship (maneuvering aid)LNG Carrier (mid‑size)
Decision Guide: Choose if the vessel needs high maneuverability in confined ports, limited hull space, and benefits from reduced drag when the thruster is retracted. Avoid if the ship requires thrust well above 30 kN, operates regularly in ice or Arctic environments, or prefers a simpler fixed‑pitch tunnel thruster with fewer moving parts.
Use Cases: Commonly installed on offshore support vessels for dynamic positioning, small tankers and container feeders for precise port entry, cruise ships for docking assistance, and any vessel where a retractable stern thruster can improve fuel efficiency by eliminating drag when not in use.
Manufacturer Datasheet
Datasheet
FU-300 bow
· 300.0 kW · Retractable azimuth bow thruster
Power (kW)
300
Thrust (kN)
36.0
Diameter (mm)
740
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Full 360° thrust vectoring gives excellent low‑speed maneuverability and station‑keeping.
  • Retractable design reduces hydrodynamic resistance and protects the propeller during transit.
  • Compact 740 mm diameter fits vessels with limited hull space or shallow draft.
  • High power‑to‑thrust ratio (36 kN at 300 kW) for a bow thruster of this size.
  • Integrated hydraulic control system conforms to Kongsberg’s standard maintenance procedures.
Weaknesses
  • Higher capital cost than conventional fixed tunnel thrusters.
  • More complex mechanical arrangement (retractable housing, seals) increases maintenance workload.
  • Not certified for heavy ice conditions; limited suitability in Arctic operations.
  • Requires dedicated hydraulic power unit and space for the retraction housing.
  • Potential for vibration or alignment issues if installation tolerances are not met.
Typical Vessels: Offshore supply vesselCruise shipContainer ship (up to ~8,000 TEU)LNG carrierRo‑Ro ferry
Certifications: DNV
Decision Guide: Choose if you need high maneuverability and want to minimise drag when the thruster is not in use, especially on vessels with limited hull space or where a retractable solution adds operational flexibility. Avoid if the vessel operates regularly in heavy ice, has very tight budget constraints, or cannot accommodate the additional hydraulic system and retraction housing.
Use Cases: The FU‑300 is typically installed as a bow thruster on offshore support ships, cruise liners and medium‑size container or LNG carriers to aid docking, dynamic positioning and low‑speed manoeuvring. Its retractable feature is valued on vessels that spend long periods underway at speed, where drag reduction improves fuel efficiency.
Manufacturer Datasheet
Datasheet
FU-300 stern
· 300.0 kW · Retractable azimuth thruster
Power (kW)
300
Thrust (kN)
36.0
Diameter (mm)
740
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (36 kN from 300 kW) improves maneuverability
  • Retractable design reduces hull drag when the unit is not in use
  • Compact 740 mm propeller diameter fits vessels with limited stern space
  • Full 360° rotation enables dynamic positioning and tight‑berth handling
  • Kongsberg heritage provides proven reliability and extensive support network
Weaknesses
  • Maximum thrust lower than larger fixed azimuth units, limiting use on very large ships
  • Hydraulic drive system adds complexity and requires regular oil monitoring
  • Retract/extend mechanism introduces additional maintenance points (seals, actuators)
  • Not optimised for heavy ice conditions; Arctic‑thruster line is required for polar work
  • Potential vibration issues if bearing play exceeds tight tolerances
Typical Vessels: Offshore support vesselDynamic positioning vessel (DP2/DP3)Cruise shipContainer feederLNG carrier (mid‑size)
Decision Guide: Choose if you need a compact, high‑maneuverability stern thruster for DP or tight‑berth operations and want drag reduction when the unit is stowed. Avoid if the vessel requires very high bollard pull, operates in heavy ice, or prefers an all‑electric drive with lower maintenance overhead.
Use Cases: Commonly installed on offshore supply ships for dynamic positioning while servicing rigs, on cruise liners for precise docking, and on mid‑size container or LNG carriers to aid harbor maneuvers and reduce reliance on tug assistance.
Manufacturer Datasheet
Datasheet
FU-400 bow
· 400.0 kW · retractable azimuth thruster
Power (kW)
400
Thrust (kN)
48.0
Diameter (mm)
820
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency.
  • Full 360° thrust vectoring provides excellent low‑speed maneuverability and dynamic positioning capability.
  • Compact installation footprint suitable for vessels with limited hull space or shallow draft requirements.
  • Kongsberg’s proven hydraulic control system offers precise thrust response.
Weaknesses
  • Mechanical retract mechanism adds complexity and requires regular inspection of seals, hydraulics and bearings.
  • Maximum thrust (48 kN) is lower than larger fixed tunnel thrusters of comparable power, limiting use on very large vessels.
  • Higher initial capital cost compared with conventional fixed bow thrusters.
  • Maintenance downtime can be longer if retract system components fail.
Typical Vessels: Offshore support vesselDynamic positioning vesselCruise shipFerryContainer feeder
Certifications: DNV
Decision Guide: Choose if you need a bow thruster that can be retracted to reduce drag, require precise 360° thrust for DP or tight‑port manoeuvring, and have the space for a retractable unit. Avoid if budget is limited, you prefer maximum thrust per kW, or operating on vessels where a fixed tunnel thruster’s simplicity outweighs the benefits of retraction.
Use Cases: The FU-400 is typically installed on offshore supply ships and DP‑class vessels that spend long periods underway at speed but also need high manoeuvrability when approaching platforms or ports. It is also used on cruise liners and ferries where reduced hull resistance during cruising is a fuel‑saving priority.
Manufacturer Datasheet
Datasheet
FU-400 stern
· 400.0 kW · Retractable azimuth thruster
Power (kW)
400
Thrust (kN)
48.0
Diameter (mm)
820
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (48 kN at 400 kW) for precise maneuvering
  • 360° rotation provides full vector control for DP and close‑quarter docking
  • Retractable design reduces drag when the thruster is not needed, improving fuel efficiency
  • Compact 820 mm propeller diameter fits in medium‑size hull tunnels
  • Kongsberg hydraulic control system offers proven reliability and integrated diagnostics
Weaknesses
  • Mechanical retraction mechanism adds complexity and requires regular inspection
  • Seal and O‑ring wear are critical in harsh marine environments, increasing maintenance intervals
  • Maximum thrust is lower than larger fixed tunnel thrusters of comparable power
  • Initial procurement cost is higher than conventional non‑retractable thrusters
  • Installation demands a dedicated retractable tunnel layout, limiting retrofit flexibility
Typical Vessels: Offshore supply vesselPlatform support / DP vesselCruise ship (mid‑size)Product tankerMultipurpose cargo vessel
Certifications: DNV GL Type Approval
Decision Guide: Choose if the vessel requires high maneuverability, dynamic positioning or tight‑port handling and benefits from reduced drag when the thruster is stowed. Avoid if hull space cannot accommodate a retractable tunnel, maintenance resources are limited, or higher thrust levels are needed for large vessels.
Use Cases: The FU‑400 is commonly installed on offshore supply ships that need DP capability while transiting to rigs, allowing the thruster to be retracted during open‑water travel. It is also used on cruise and product tanker sterns for precise docking in congested ports, where rapid vectoring and drag reduction improve turnaround time.
Manufacturer Datasheet
Datasheet
FU-500 bow
· 500.0 kW · Retractable azimuth thruster
Power (kW)
500
Thrust (kN)
60.0
Diameter (mm)
900
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈60 kN at 500 kW)
  • Full 360° rotation for precise low‑speed maneuvering and DP assistance
  • Retractable design reduces hydrodynamic drag during normal cruising
  • Compact installation suitable for vessels with limited hull penetration
  • Integrated hydraulic drive compatible with Kongsberg control and monitoring systems
Weaknesses
  • More complex mechanical seals and retractable mechanism increase maintenance workload
  • Higher capital cost than comparable fixed tunnel thrusters
  • Maximum thrust lower than larger non‑retractable azimuth units of the same power class
  • Requires dedicated hydraulic power unit and space for retraction housing
  • Seal and bearing wear can be accelerated in harsh marine or ice conditions
Typical Vessels: Offshore supply vessel (OSV)Cruise shipContainer feederLNG carrier with tight port constraintsRo‑Ro ferryMulti‑purpose bulk carrier
Certifications: DNV GL Class ApprovalABS ClassificationLloyd's Register Approval
Decision Guide: Choose if the vessel needs high maneuverability, low transit drag and a bow thruster that can be stowed when not required (e.g., DP‑assisted ships, vessels operating in confined ports). Avoid if budget is limited, space for the retraction housing is unavailable, or the operational profile does not justify the added complexity over a conventional fixed tunnel thruster.
Use Cases: The FU‑500 is typically installed on ships that require precise low‑speed positioning such as offshore support vessels during DP operations, cruise liners docking in crowded harbours, container feeders needing quick berthing turns, and LNG carriers where hull form efficiency is critical. Its retractable feature allows the thruster to be hidden during open‑sea voyages to minimise resistance.
Manufacturer Datasheet
Datasheet
FU-500 stern
· 500.0 kW · Retractable azimuth thruster
Power (kW)
500
Thrust (kN)
60.0
Diameter (mm)
900
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈60 kN @ 500 kW) for excellent low‑speed maneuverability
  • Retractable design reduces hull resistance when the thruster is not in use
  • Full 360° rotation provides precise vectoring for dynamic positioning and tight port turns
  • Compact diameter fits vessels with limited hull space or narrow tunnel arrangements
  • Kongsberg’s proven hydraulic control system offers reliable response
Weaknesses
  • Maximum power (500 kW) may be insufficient for large DP‑required vessels
  • Retractable mechanism adds mechanical complexity and maintenance requirements
  • Not certified for ice‑class or extreme Arctic conditions
  • Higher upfront cost compared with fixed tunnel thrusters of similar rating
  • Requires dedicated hydraulic power unit and regular seal inspections
Typical Vessels: Offshore supply vesselPlatform support vesselCruise ship (mid‑size)Container feederRo‑Ro ferrySmall tankers
Decision Guide: Choose if you need high thrust in a limited hull space and want the drag‑reduction benefit of a retractable unit for cruising or low‑speed operation. Avoid on vessels that require ice‑class capability, very high DP power (>500 kW), or where maintenance resources for hydraulic/retractable systems are constrained.
Use Cases: The FU‑500 is typically installed on mid‑size offshore and commercial ships to provide precise bow‑or stern‑side thrust for dynamic positioning, tight berth handling, and rapid maneuvering in confined ports. Its retractable feature allows the thruster to be stowed during open‑water transit to improve fuel efficiency.
Manufacturer Datasheet
Datasheet
FU-600 bow
· 600.0 kW · Retractable azimuth thruster
Power (kW)
600
Thrust (kN)
72.0
Diameter (mm)
980
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Retractable design reduces hydrodynamic drag during transit, improving fuel efficiency.
  • High thrust‑to‑power ratio (72 kN @ 600 kW) gives excellent low‑speed maneuverability and DP support.
  • Full 360° azimuth swing enables precise station‑keeping and tight turning circles.
  • Compact 980 mm propeller diameter fits vessels with limited hull space for bow thrusters.
  • Kongsberg’s proven hydraulic drive system offers reliable power transmission and easy integration with existing ship control systems.
Weaknesses
  • Retractable mechanism adds mechanical complexity and requires regular inspection of seals, hydraulics and the retraction gear.
  • Higher upfront cost and longer installation time compared with fixed tunnel thrusters.
  • Maintenance intervals are more demanding (seal wear, bearing play, hydraulic fluid condition) especially in harsh environments.
  • Limited suitability for heavy ice‑class operations; not an Arctic Thruster variant.
  • Potential for reduced thrust when the unit is partially retracted or if debris interferes with the deployment path.
Typical Vessels: Offshore supply vesselPlatform supply vessel (PSV)Anchor handling tug supply (AHTS)Dynamic positioning vessels (DP2/DP3)Cruise ships and large passenger ferriesContainer ships requiring enhanced port maneuverability
Certifications: DNV
Decision Guide: Choose the FU‑600 when a vessel needs high manoeuvring performance, DP capability and wants to minimise cruising resistance by stowing the thruster. It is ideal for offshore support ships with limited bow space. Avoid if budget constraints favour simpler fixed tunnel thrusters, if ice‑class operation is required, or where maintenance resources are limited.
Use Cases: The FU‑600 is commonly installed on offshore supply and DP vessels to provide precise station‑keeping during drilling or subsea operations, and on large passenger ships for tight port turns and rapid berthing. Its retractable feature is exploited on long voyages to lower drag, then deployed when entering congested ports or performing dynamic positioning tasks.
Manufacturer Datasheet
Datasheet
FU-600 stern
· 600.0 kW · Retractable Azimuth Thruster
Power (kW)
600
Thrust (kN)
72.0
Diameter (mm)
980
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust-to-power ratio (72 kN at 600 kW)
  • Retractable design reduces hull resistance when not in use
  • 360° rotation provides excellent maneuvering and dynamic positioning capability
  • Integrated double‑gearbox hydraulic control system offers high reliability
  • Backed by Kongsberg/Rolls‑Royce global support network
Weaknesses
  • Maximum power limited to 600 kW, unsuitable for very large vessels requiring >1 MW thrusters
  • Retractable mechanism adds mechanical complexity and maintenance workload
  • Requires a dedicated hydraulic power unit, increasing system weight and space allocation
  • Propeller diameter (980 mm) may be less efficient at low speeds compared with larger tunnel thrusters
  • Not certified for extreme ice conditions like the Arctic Thruster series
Typical Vessels: Offshore Supply VesselDP2 Platform Support VesselCruise ShipContainer FeederProduct Tanker
Certifications: IMO Type ApprovalDNV
Decision Guide: Choose if you need a compact high‑thrust stern thruster with 360° swing for dynamic positioning or tight‑berthing situations and you value the ability to retract the unit to reduce drag. Avoid if vessel power requirements exceed ~600 kW, ice class operation is required, or you prefer a fixed tunnel thruster with lower maintenance complexity.
Use Cases: Commonly installed on offshore support vessels for DP‑2 operations, cruise ships for precise stern maneuvering in ports, and medium‑size product tankers where hull space is limited. The retractable feature allows the thruster to be stowed during open‑water transit to improve fuel efficiency.
Manufacturer Datasheet
Datasheet
FU-750 bow
· 750.0 kW · retractable azimuth thruster
Power (kW)
750
Thrust (kN)
90.0
Diameter (mm)
1100
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (90 kN at 750 kW) for precise low‑speed manoeuvring
  • Retractable design eliminates hull resistance when not in use, improving fuel efficiency
  • Compact 1.1 m tunnel diameter fits vessels with limited bow space
  • Kongsberg’s proven hydraulic drive offers smooth 360° thrust vectoring and low vibration
  • Standardised maintenance intervals and extensive OEM support
Weaknesses
  • Maximum power of 750 kW may be insufficient for very large tankers or cruise ships requiring >100 kN bow thrust
  • Retractable mechanism adds mechanical complexity and higher installation cost compared with fixed tunnel thrusters
  • Requires dedicated hydraulic system and regular seal inspections to prevent leaks
  • Not certified for heavy ice conditions; unsuitable for Arctic‑class operations
  • Spare parts inventory larger due to retractable gear and specialised bearings
Typical Vessels: Container ships (up to ~8,000 TEU)Cruise vesselsOffshore supply & support vesselsFerriesLNG carriers (mid‑size)
Certifications: IMO Type ApprovalDNVGL Classification
Decision Guide: Choose the FU-750 when a vessel needs strong bow thrust in a confined hull space and benefits from reduced drag during transit, such as mid‑size container ships, cruise liners, or offshore support vessels. Avoid it for ice‑class ships, ultra‑large tankers requiring >100 kN bow thrust, or projects where simplicity and lowest upfront cost are paramount.
Use Cases: The FU-750 is commonly installed on modern merchant vessels to provide dynamic positioning assistance, tight port entry/exit handling, and enhanced maneuverability during offshore operations. Its retractable feature is especially valued on ships that spend long periods cruising at speed, as the thruster can be stowed to minimise resistance.
Manufacturer Datasheet
Datasheet
FU-750 stern
· 750.0 kW · Retractable azimuth thruster
Power (kW)
750
Thrust (kN)
90.0
Diameter (mm)
1100
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈90 kN at 750 kW) for strong maneuvering and DP capability
  • Full 360° rotation provides precise vector control for station‑keeping
  • Retractable design reduces hull resistance during transit, improving fuel efficiency
  • Compact installation suitable for vessels with limited aft space
  • Proven Kongsberg/Rolls‑Royce hydraulic control system with built‑in diagnostics
Weaknesses
  • Complex hydraulic and seal systems require regular inspection and specialist maintenance
  • Higher capital cost compared with fixed tunnel thrusters of similar power
  • Retractable mechanism adds weight and occupies internal volume in the hull
  • Potential for propeller‑blade fouling or damage when operating in debris‑rich waters
  • Limited to vessels that can accommodate the required tunnel geometry
Typical Vessels: Offshore supply vessel (OSV)Dynamic positioning (DP) platform support shipCruise liner with stern maneuvering requirementsLNG carrier or chemical tanker needing precise dockingResearch vessel operating in confined ports
Certifications: DNVABS
Decision Guide: Choose if the vessel needs high‑power, 360° thrust for DP or tight‑berth maneuvers and can benefit from reduced drag when the thruster is retracted. Avoid if budget constraints favour a simpler fixed tunnel thruster, or if hull space cannot accommodate the retractable tunnel geometry.
Use Cases: The FU-750 is typically installed on offshore support ships and DP‑class vessels where precise station‑keeping is critical, such as during offshore platform supply, subsea installation, or when docking large cruise ships in restricted ports. Its retractability also makes it attractive for high‑speed vessels that want to minimise resistance during cruising.
Manufacturer Datasheet
Datasheet
FU-800 bow
· 800.0 kW · Retractable azimuth hydraulic thruster
Power (kW)
800
Thrust (kN)
96.0
Diameter (mm)
1140
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High bow‑thruster power (800 kW) suitable for large DP‑class vessels
  • Retractable design reduces hydrodynamic drag during transit
  • Full 360° azimuth gives superior maneuverability in confined ports
  • Proven Kongsberg/Rolls‑Royce hydraulic drive with built‑in redundancy
  • Standardised mounting and control interface compatible with most ship automation systems
Weaknesses
  • Large tunnel diameter (1.14 m) requires significant hull space and structural reinforcement
  • Complex hydraulic system increases maintenance workload compared with electric thrusters
  • Higher acquisition and life‑cycle cost than fixed tunnel thrusters of similar power
  • Seal and bearing wear are critical; regular inspection is mandatory
  • Retractable mechanism adds weight high in the bow, affecting stability calculations
Typical Vessels: Container ships (>80 000 dwt)Cruise liners (≥100 000 GT)LNG carriersOffshore supply & anchor handling tug supply vessels (AHTS)DP2/DP3 tankers and platform support vessels
Certifications: IMO Type Approval (D‑2)DNV Class – approved for DP applications
Decision Guide: Choose if the vessel requires high bow thrust for dynamic positioning, tight port manoeuvring, or wants drag reduction during cruising. Avoid on small ships with limited hull volume, where lower‑cost fixed tunnel thrusters meet the maneuverability needs, or when budget constraints preclude the higher capital and maintenance costs.
Use Cases: The FU‑800 is commonly installed on large LNG carriers to assist in precise berthing under DP, on cruise ships for rapid port entry while minimizing fuel consumption during open‑water sailing, and on offshore supply vessels that need both high thrust and a streamlined hull profile when transiting to offshore rigs.
Manufacturer Datasheet
Datasheet
FU-800 stern
· 800.0 kW · Retractable azimuth thruster
Power (kW)
800
Thrust (kN)
96.0
Diameter (mm)
1140
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (96 kN at 800 kW) for strong low‑speed maneuvering
  • Retractable design reduces hull resistance and fuel consumption during transit
  • Full 360° rotation provides excellent maneuverability and DP capability
  • Compact propeller diameter (1.14 m) fits medium‑size vessels with limited stern space
  • Proven Kongsberg/Rolls‑Royce reliability and global support network
Weaknesses
  • Hydraulic drive system adds complexity, requiring regular oil monitoring and seal maintenance
  • Retract/extend mechanism occupies additional hull volume and adds weight
  • Maximum power (800 kW) may be insufficient for very large DP‑required vessels
  • Higher upfront cost compared with fixed tunnel thrusters of similar rating
  • Potential for hydraulic leaks if seals are not inspected per the detailed maintenance checklist
Typical Vessels: Offshore Supply Vessel (OSV)Platform Supply Vessel (PSV)Anchor Handling Tug Supply (AHTS) – medium sizeCruise ship or passenger ferry with DP requirementsContainer feeder / small container ship
Decision Guide: Choose if you need a high‑thrust, 360° maneuvering solution on a vessel where hull drag must be minimised during cruise and dynamic positioning is required. Avoid if the vessel requires >1 MW of thruster power, prefers an all‑electric drive, or has limited stern space for the retraction mechanism.
Use Cases: The FU‑800 is typically installed on offshore support vessels that perform dynamic positioning while loading/offloading rigs, on cruise ships needing precise docking in tight ports, and on medium‑size cargo vessels where a retractable thruster reduces resistance during open‑water travel yet provides strong low‑speed thrust for maneuvering.
Manufacturer Datasheet
Datasheet
FU-1000 bow
· 1000.0 kW · Retractable Azimuth Thruster
Power (kW)
1000
Thrust (kN)
120.0
Diameter (mm)
1300
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑size ratio (1 MW in a 1.3 m diameter unit)
  • Retractable design reduces hydrodynamic drag during transit
  • Full 360° thrust vectoring improves maneuverability and DP performance
  • Proven Kongsberg/Rolls‑Royce hydraulic drive with built‑in redundancy
  • Standard class approvals (DNV, ABS) for offshore DP vessels
Weaknesses
  • Complex hydraulic system increases maintenance workload
  • Retractable mechanism adds weight and occupies internal hull space
  • Higher acquisition cost compared to fixed tunnel thrusters of similar thrust
  • Requires regular inspection of propeller blades, shaft seals and bearings
  • Limited availability of spare parts in remote ports
Typical Vessels: Offshore Supply Vessel (OSV)Dynamic Positioning vessel (DP2/DP3)Cruise shipLarge container or bulk carrier requiring bow assistanceLNG/LPG carrier with tight port constraints
Certifications: DNV GL class approvalABS class approval
Decision Guide: Choose if the vessel needs high thrust for DP or tight‑berth maneuvering and benefits from reduced drag during cruising. Avoid if budget is constrained, maintenance resources are limited, or a fixed tunnel thruster can meet the required thrust.
Use Cases: The FU-1000 is typically installed on offshore support ships that perform dynamic positioning near rigs, on cruise liners docking in congested harbours, and on large cargo vessels where bow‑side space is at a premium but high maneuverability is essential.
Manufacturer Datasheet
Datasheet
FU-1000 stern
· 1000.0 kW · Retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
120.0
Diameter (mm)
1300
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (120 kN @ 1 MW) suitable for DP2/DP3 vessels
  • Retractable design reduces drag when the thruster is not in use, improving fuel efficiency
  • Full 360° swivel gives excellent maneuverability and station‑keeping capability
  • Hydraulic drive offers robust torque transmission and proven reliability
  • Standard Kongsberg control integration simplifies DP system installation
Weaknesses
  • Complex hydraulic and retractable mechanisms increase maintenance workload
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power
  • Space required for retraction housing can limit hull design options on smaller ships
  • Potential for seal wear and propeller blade fouling in harsh environments, requiring regular inspections
  • Weight and structural loads at the stern must be accommodated in ship design
Typical Vessels: Offshore supply vessel (OSV)Anchor handling tug supply (AHTS)Dynamic positioning platform support vesselMultipurpose offshore vesselLarge ferry or cruise ship requiring stern maneuvering assistance
Decision Guide: Choose the FU‑1000 when a vessel needs high thrust for dynamic positioning, wants drag reduction during transit, and can accommodate the hydraulic/retractable system. Avoid it on budget‑constrained projects, small hulls with limited stern space, or where simpler fixed thrusters meet performance requirements.
Use Cases: The FU‑1000 is typically installed on DP‑enabled offshore support ships to hold position beside drilling rigs, assist in tight port entries, and provide rapid reverse thrust for emergency maneuvers. Its retractable feature is valuable on vessels that spend long periods cruising at speed, allowing the thruster to be stowed to minimise resistance.
Manufacturer Datasheet
Datasheet
FU-1200 bow
· 1200.0 kW · Retractable azimuth thruster
Power (kW)
1200
Thrust (kN)
144.0
Diameter (mm)
1460
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑size ratio – 1200 kW delivered through a 1.46 m propeller diameter.
  • Retractable design reduces hydrodynamic resistance and protects the unit in heavy seas.
  • Full 360° rotation gives excellent low‑speed manoeuvring and DP capability.
  • Kongsberg’s proven hydraulic control system with standardised inspection points simplifies maintenance.
Weaknesses
  • Higher capital cost compared with fixed tunnel thrusters of similar thrust.
  • Complex retractable mechanism adds moving parts that require regular inspection and can be a failure source.
  • Hydraulic system demands strict oil cleanliness and periodic seal replacement, increasing O&M effort.
  • Maximum thrust (144 kN) may be insufficient for very large vessels requiring >200 kN bow thrust.
Typical Vessels: Container shipTankerBulk carrierCruise shipOffshore supply vessel
Decision Guide: Choose if you need a high‑thrust bow thruster on vessels where hull drag must be minimised when the unit is not in use, such as DP‑equipped tankers or offshore support ships. Avoid if budget constraints dominate, if the vessel operates only in calm waters where a fixed tunnel thruster would suffice, or if thrust requirements exceed 150 kN.
Use Cases: The FU‑1200 is typically installed on medium‑to‑large commercial vessels that require precise low‑speed handling and dynamic positioning – e.g., tankers entering congested ports, container ships needing tight berth alignment, cruise liners docking in restricted harbours, and offshore supply vessels operating near rigs where rapid manoeuvreability is critical.
Manufacturer Datasheet
Datasheet
FU-1200 stern
· 1200.0 kW · Retractable azimuth thruster
Power (kW)
1200
Thrust (kN)
144.0
Diameter (mm)
1460
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (144 kN from 1 200 kW) suitable for large vessels
  • Retractable design reduces hull resistance and fuel consumption during cruise
  • Full 360° swivel gives excellent station‑keeping and low‑speed maneuvering
  • Hydraulic drive provides proven reliability and easy integration with existing DP systems
  • Kongsberg’s extensive service network and documented maintenance procedures
Weaknesses
  • Complex hydraulic system increases installation cost and requires specialised maintenance
  • Retractable mechanism adds moving parts that are prone to seal wear and require regular inspection
  • Requires a dedicated tunnel space in the hull, limiting applicability on smaller ships
  • Higher upfront capital expense compared with fixed tunnel thrusters of similar power
Typical Vessels: Aframax / VLCC tankersLarge container vesselsCruise shipsOffshore supply and anchor handling tug supply (AHTS) vesselsLNG carriers with DP requirements
Certifications: DNV GL Type ApprovalABS Classification
Decision Guide: Choose the FU‑1200 when a vessel needs high‑power DP maneuverability and can accommodate a retractable tunnel to gain cruise‑mode drag reduction. Avoid it on ships with limited hull space, tight budget constraints, or where a simpler fixed thruster meets the operational profile.
Use Cases: Commonly installed on deep‑water tankers and offshore support vessels that perform dynamic positioning, tight port turns, and ice‑adjacent operations; the retractable feature is exploited during long transits to lower fuel burn while still providing full thrust when docking or station‑keeping.
Manufacturer Datasheet
Datasheet
FU-1500 bow
· 1500.0 kW · Retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
180.0
Diameter (mm)
1700
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • 360° swivel gives precise low‑speed maneuvering and DP capability
  • Thrust of 180 kN at 1 500 kW offers a high thrust‑to‑power ratio for its size
  • Retractable design eliminates hull resistance and protects the propeller in shallow or ice‑prone waters
  • Double‑gear hydraulic drive provides reliable power transmission and redundancy
  • Integrated control system compatible with most ship bridge consoles
Weaknesses
  • Higher initial purchase and installation cost compared with fixed tunnel thrusters
  • Complex hydraulic and retraction mechanisms increase maintenance workload
  • Requires dedicated hull space for the retractable housing, limiting applicability on smaller vessels
  • Weight of the unit adds to vessel displacement and may affect stability calculations
  • Performance can be reduced if the retraction mechanism is not fully extended or suffers wear
Typical Vessels: Offshore supply vesselDP‑class tankerCruise shipContainer ship (large, >150 m LOA)LNG carrier with dynamic positioning
Certifications: IMO D‑2 Type ApprovalDNV Class notation
Decision Guide: Choose if the vessel needs high maneuverability and wants to minimise hull resistance when the thruster is not in use – typical for DP vessels, cruise ships and large cargo carriers operating in confined ports or shallow waters. Avoid if budget constraints, limited hull space, or a simpler fixed tunnel thruster would meet the manoeuvring requirements.
Use Cases: The FU‑1500 is commonly installed on offshore support ships that require dynamic positioning while also benefiting from reduced drag during transit. It is also used on large container and cruise vessels to aid in berthing and unberthing in tight harbours, and on ice‑class ships where the ability to retract protects the unit from ice impact.
Manufacturer Datasheet
Datasheet
FU-1500 stern
· 1500.0 kW · Retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
180.0
Diameter (mm)
1700
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑thrust ratio (1500 kW → 180 kN) suitable for DP‑class vessels
  • Retractable design reduces drag during cruising and protects the unit in ice or debris
  • Full 360° swivel gives excellent low‑speed maneuverability and station‑keeping
  • Kongsberg’s dual‑gear hydraulic drive offers redundancy and fine thrust control
  • Standardised mounting (UL/ULE series) simplifies integration on new builds
Weaknesses
  • Complex hydraulic system requires regular oil analysis and filter changes
  • Retractable mechanism adds mechanical wear points that need periodic inspection
  • Higher initial cost compared with fixed tunnel thrusters of similar thrust
  • Maintenance access can be limited when installed in deep stern tunnels
  • Large diameter (1.7 m) may limit installation on vessels with restricted hull space
Typical Vessels: Aframax / VLCC tankersContainer ships >10,000 TEUCruise linersOffshore supply vesselsIce‑class bulk carriers requiring DP capability
Certifications: DNV Class ApprovedABS Approved
Decision Guide: Choose if: you need high thrust for dynamic positioning, frequent low‑speed maneuvers, or want drag reduction when the thruster is not in use. Avoid if: budget constraints limit upfront cost, hull geometry cannot accommodate a retractable unit, or you prefer a simpler fixed tunnel thruster with lower maintenance overhead.
Use Cases: The FU‑1500 is commonly installed on large tankers and container ships that operate under DP‑2 requirements, cruise vessels docking in congested ports, and ice‑strengthened bulk carriers where the retractable feature protects the unit from ice impact while cruising. It also serves offshore supply vessels that need rapid thrust vectoring for station‑keeping near rigs.
Manufacturer Datasheet
Datasheet
FU-1800 bow
· 1800.0 kW · Retractable azimuth thruster
Power (kW)
1800
Thrust (kN)
216.0
Diameter (mm)
1940
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑size ratio (216 kN) suitable for large vessels requiring strong maneuvering forces.
  • Retractable design eliminates tunnel resistance during transit, improving fuel efficiency.
  • Full 360° azimuth steering provides precise low‑speed positioning and DP support.
  • Proven Kongsberg/Rolls‑Royce hydraulic drive system with built‑in redundancy.
  • Standardised mounting interface compatible with most modern hull forms.
Weaknesses
  • Large propeller diameter (1.94 m) limits installation on vessels with restricted bow space.
  • Complex hydraulic and seal assemblies increase maintenance workload compared with fixed tunnel thrusters.
  • Higher initial capital cost and longer lead‑time for spare parts.
  • Power demand (1.8 MW) can be significant for ships with limited auxiliary generation capacity.
  • Retractable mechanism adds mechanical points of failure that require periodic inspection.
Typical Vessels: Ultra‑large container shipCruise linerLNG carrierOffshore supply vessel (DP‑class)Very large crude carrier
Certifications: DNV GL Type ApprovalABS Approved
Decision Guide: Choose the FU-1800 when a vessel needs maximum bow thrust for tight port manoeuvring or dynamic positioning and can accommodate a retractable unit without compromising hull integrity. Avoid it on smaller ships, vessels with limited auxiliary power, or projects where upfront cost and maintenance complexity outweigh the benefits of reduced transit drag.
Use Cases: The FU-1800 is typically installed on deep‑draft, high‑value vessels that perform frequent port calls in confined harbours, require precise station‑keeping for offshore operations, or operate under strict emissions regimes where reducing hull resistance during cruise is advantageous. It is also favoured on ships that need to meet stringent DP performance criteria.
Manufacturer Datasheet
Datasheet
FU-1800 stern
· 1800.0 kW · hydraulic retractable azimuth thruster
Power (kW)
1800
Thrust (kN)
216.0
Diameter (mm)
1940
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑thrust ratio (1800 kW → 216 kN) suitable for large DP vessels
  • Retractable design minimizes drag and fuel consumption when the thruster is stowed
  • Full 360° azimuth rotation provides excellent maneuverability and bollard‑pull capability
  • Robust double‑gear hydraulic drive from Kongsberg ensures reliable torque transmission
  • Standard Kongsberg control interface (K‑Master) simplifies integration with ship automation
Weaknesses
  • Hydraulic system adds complexity, requiring regular oil analysis, filtration and pressure monitoring
  • Retractable mechanism introduces additional wear points and potential seal leakage
  • Large tunnel diameter (≈1.94 m) limits installation to vessels with sufficient hull space
  • Higher capital cost compared with fixed tunnel thrusters of similar power
  • Maintenance downtime can be longer due to access constraints in the stern tunnel
Typical Vessels: Very Large Crude Carrier (VLCC)LNG carrierCruise shipOffshore supply vessel (OSV)DP2/DP3 container or bulk carrier
Certifications: DNVABS
Decision Guide: Choose if the vessel requires high thrust for DP operations, benefits from reduced drag when the thruster is stowed, and has sufficient stern space for a ~2 m tunnel. Avoid if budget constraints favour simpler fixed thrusters, if an electric permanent‑magnet solution is preferred for efficiency, or if hull geometry cannot accommodate the retractable unit.
Use Cases: The FU‑1800 is typically installed on large tankers, LNG carriers and cruise ships to provide lateral thrust for port maneuvering, dynamic positioning during offshore loading/unloading, and emergency bollard‑pull assistance. Its retractable feature is especially valuable on vessels that spend long periods cruising at speed, where drag reduction improves fuel economy.
Manufacturer Datasheet
Datasheet
FU-2000 bow
· 2000.0 kW · Retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
240.0
Diameter (mm)
2100
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑thrust ratio (2000 kW / 240 kN) for excellent low‑speed manoeuvring and DP support
  • Retractable design reduces hull resistance during transit, improving fuel efficiency
  • Full 360° azimuth swing provides precise station‑keeping and tight turning circles
  • Proven Kongsberg/Rolls‑Royce hydraulic control system with built‑in diagnostics
  • Standardised bearing and seal packages simplify spare‑parts logistics
Weaknesses
  • Large 2.1 m propeller diameter requires significant hull penetration space
  • Complex hydraulic and retractable mechanisms increase maintenance workload
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power
  • Requires regular inspection of propeller blades, shaft seals and bearing clearances to avoid premature wear
  • Weight and installation depth may limit suitability for smaller vessels or shallow drafts
Typical Vessels: Large container shipsCrude oil & product tankers (>30 kt)LNG carriersCruise linersOffshore supply vessels (OSVs) and FPSOs with DP requirements
Decision Guide: Choose if the vessel needs high thrust bow manoeuvring, dynamic positioning or frequent port turns and can accommodate a retractable unit to save cruise resistance. Avoid on small‑size ships, shallow‑draft vessels or projects where capital cost and maintenance complexity outweigh the maneuverability benefit.
Use Cases: The FU‑2000 is typically installed on deep‑draught, high‑deadweight vessels that operate in congested ports, require precise station‑keeping for offshore operations, or need to meet stringent DP class requirements. Its retractable feature is especially valuable for ships that spend most of their time underway and only need thruster assistance during docking or maneuvering.
Manufacturer Datasheet
Datasheet
FU-2000 stern
· 2000.0 kW · Retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
240.0
Diameter (mm)
2100
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑thrust ratio (2000 kW → 240 kN) suitable for large vessels
  • Retractable design reduces hull resistance when the thruster is not in use, improving fuel efficiency
  • Full 360° rotation provides excellent manoeuvring and dynamic positioning capability
  • Compact installation footprint compared with fixed tunnel thrusters of similar power
  • Proven Kongsberg/Rolls‑Royce hydraulic drive system with double‑gear arrangement for reliability
Weaknesses
  • Complex hydraulic system increases maintenance workload and requires specialised spare parts
  • Large propeller diameter (2.1 m) may limit installation in vessels with restricted hull space
  • Higher capital cost than conventional fixed tunnel thrusters of comparable power
  • Retract/extend cycles accelerate wear on shaft seals and O‑rings, demanding regular inspection
  • Requires dedicated control and monitoring electronics not always standard on older ships
Typical Vessels: Very Large Crude Carriers (VLCC)LNG carriersCruise shipsOffshore supply vessels (OSV) with DP requirementsLarge container ships needing high manoeuvrability
Decision Guide: Choose the FU‑2000 when a vessel needs maximum thrust for tight port operations or dynamic positioning and can benefit from reduced drag during transit by retracting the thruster. Avoid if budget constraints, limited hull space, or a simpler maintenance regime are higher priorities.
Use Cases: The FU‑2000 is commonly installed on deep‑draft tankers and LNG carriers to provide precise low‑speed control for berthing, unberthing and DP operations in offshore wind or drilling support. Cruise ships use it to enhance docking manoeuvres while keeping the hull streamlined during cruising.
Manufacturer Datasheet
Datasheet
FU-2200 bow
· 2200.0 kW · Retractable azimuth thruster
Power (kW)
2200
Thrust (kN)
264.0
Diameter (mm)
2260
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust output (264 kN) suitable for DP and tight‑maneuvering operations
  • Retractable design reduces hull resistance when the unit is stowed
  • Full 360° rotation provides excellent directional control
  • Compact footprint compared with fixed tunnel thrusters of similar power
  • Proven Kongsberg/ Rolls‑Royce hydraulic drive reliability
Weaknesses
  • Complex hydraulic and sealing system increases maintenance workload
  • Higher capital cost than conventional fixed tunnel thrusters
  • Requires sufficient hull space for retraction mechanism and ducting
  • Potential for seal wear in the retractable bearing assembly
  • Weight and installation complexity may limit retrofit on older vessels
Typical Vessels: Aframax tankerLNG carrierOffshore supply vessel (OSV)Cruise shipLarge container vessel with DP requirements
Decision Guide: Choose if the vessel needs high bow thrust for dynamic positioning, tight‑harbor manoeuvring, or wants to minimise drag when the thruster is not in use. Avoid if budget constraints are dominant, the ship lacks sufficient hull volume for a retractable unit, or the operational profile does not demand DP‑level maneuverability.
Use Cases: The FU‑2200 is typically installed on new builds of large tankers, LNG carriers and offshore support ships that operate in congested ports or require dynamic positioning. It is also used on cruise liners for precise docking and on container vessels where bow thrust improves berth handling while the retractable feature keeps cruising resistance low.
Manufacturer Datasheet
Datasheet
FU-2200 stern
· 2200.0 kW · Retractable Azimuth Thruster
Power (kW)
2200
Thrust (kN)
264.0
Diameter (mm)
2260
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑thrust ratio (2 200 kW / 264 kN) suitable for large vessels
  • Retractable design reduces hydrodynamic resistance when not in use
  • 360° swivel provides excellent maneuverability and DP capability
  • Compact diameter (2.26 m) fits a wide range of hull forms
  • Proven Kongsberg/Rolls‑Royce reliability and global support network
Weaknesses
  • Complex retractable mechanism increases maintenance workload
  • Higher capital cost compared with fixed tunnel thrusters
  • Requires dedicated hydraulic power unit and retraction housing space
  • Potential for seal wear at the propeller shaft due to frequent deployment cycles
  • Limited to stern installations on vessels that can accommodate the retraction well
Typical Vessels: Very Large Crude Carriers (VLCC)Ultra‑Large Container Ships (ULCS)Cruise shipsLNG carriers with DP requirementsOffshore supply and anchor handling tug supply vessels
Certifications: IMO Type Approval
Decision Guide: Choose the FU-2200 when a vessel needs high thrust for DP or tight port manoeuvring and also benefits from reduced drag during transit – typical on large tankers, container ships and cruise liners. Avoid if budget constraints favour simpler fixed thrusters, the ship lacks space for a retraction well, or operational profiles involve low‑speed manoeuvring only.
Use Cases: The unit is commonly installed on DP2/DP3 vessels for dynamic positioning during offshore operations, on large tankers and container ships for precise berthing in confined ports, and on cruise ships to enhance low‑speed handling while allowing the thruster to be retracted for fuel‑efficient cruising.
Manufacturer Datasheet
Datasheet
FU-2500 bow
· 2500.0 kW · Retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
300.0
Diameter (mm)
2500
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈300 kN at 2.5 MW) for rapid lateral manoeuvring
  • Retractable design reduces hydrodynamic resistance and protects the unit in open sea
  • Full 360° vectoring provides excellent station‑keeping and DP performance
  • Compact bow installation compatible with large vessels where hull space is limited
  • Kongsberg’s proven control integration and global support network
Weaknesses
  • Requires substantial hydraulic/electrical infrastructure and dedicated power supply
  • Complex retractable mechanism adds maintenance tasks compared with fixed tunnel thrusters
  • Higher capital cost and longer lead‑time than conventional fixed bow thrusters
  • Spare‑part logistics can be challenging for remote ports or smaller shipyards
  • Shaft seal wear is a known failure point, especially in high‑pressure or contaminated water
Typical Vessels: VLCC / ULCC crude carriersLarge container ships (≥10 000 TEU)Cruise linersLNG carriersOffshore supply & anchor handling tug supply vessels
Certifications: DNV classification approvalIMO Type Approval
Decision Guide: Choose the FU‑2500 when a vessel needs high bow thrust for DP or tight‑berth manoeuvring and benefits from reduced drag during transit. Avoid it on low‑budget projects, vessels operating primarily in ice where an Arctic‑rated thruster is required, or ships with limited space for the associated hydraulic/electrical plant.
Use Cases: The FU‑2500 is typically installed on deep‑draft tankers and container ships to provide precise lateral control during docking, as well as on cruise ships and offshore support vessels that require dynamic positioning in confined waters. Its retractable feature is especially valued on long voyages where drag reduction improves fuel efficiency.
Manufacturer Datasheet
Datasheet
FU-2500 stern
· 2500.0 kW · Retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
300.0
Diameter (mm)
2500
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (300 kN at 2500 kW) suitable for DP‑class vessels
  • Retractable design reduces hull resistance when the thruster is not in use
  • Full 360° rotation gives excellent maneuverability for tight berthing and offshore operations
  • Integrated hydraulic control system allows rapid thrust vector changes
  • Proven Kongsberg/Rolls‑Royce engineering with extensive global support
Weaknesses
  • Complex hydraulic and retraction mechanisms increase installation cost and maintenance workload
  • Requires regular inspection of propeller blades, shaft seals and bearings to prevent wear‑related failures
  • Higher initial capital expense compared with fixed tunnel thrusters of similar power
  • Hull space needed for the retractable housing limits applicability on vessels with constrained stern sections
  • Potential for hydraulic fluid leaks if seal maintenance is neglected
Typical Vessels: Offshore supply vesselDynamic positioning (DP) vesselLarge tanker or bulk carrier requiring stern maneuvering aidCruise shipLNG/LPG carrier with DP capability
Decision Guide: Choose if the vessel needs high thrust for dynamic positioning, frequent tight‑berth maneuvers, or wants to minimise drag when the thruster is idle. Avoid if budget constraints limit upfront cost, maintenance resources are scarce, or hull geometry cannot accommodate the retractable housing.
Use Cases: The FU‑2500 is typically installed on DP‑class offshore support ships and large commercial vessels that require precise stern thrust for station‑keeping, low‑speed maneuvering in confined ports, and reduced resistance during transit when retracted. It is also used on cruise ships to improve docking accuracy.
Manufacturer Datasheet
Datasheet
FU-3000 bow
· 3000.0 kW · Retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
360.0
Diameter (mm)
2900
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑thrust ratio (3000 kW → 360 kN) suitable for large vessels
  • Retractable design reduces hull resistance when the unit is stowed
  • Full 360° rotation gives excellent manoeuvrability and DP support
  • Proven Kongsberg/Rolls‑Royce hydraulic control system with integrated diagnostics
  • Standardised dimensions (2.9 m propeller diameter) fit many new‑build hull forms
Weaknesses
  • Complex hydraulic system increases installation cost and maintenance workload
  • Requires regular inspection of seals, bearings and propeller blades to avoid wear‑related failures
  • Large tunnel diameter may necessitate hull reinforcement in existing ships
  • Higher upfront capital expense compared with fixed tunnel thrusters of similar power
  • Retractable mechanism adds moving parts that can be prone to corrosion in harsh environments
Typical Vessels: Ultra‑large crude carriers (ULCC)Very large ore carriers (VLOC)LNG carriersCruise shipsOffshore support vessels with DP requirements
Decision Guide: Choose if the vessel needs high thrust bow manoeuvring, dynamic positioning capability and wants to minimise cruising drag by stowing the thruster. Avoid on smaller ships where a fixed tunnel thruster provides sufficient power at lower cost, or when budget constraints limit complex hydraulic installations.
Use Cases: The FU‑3000 is typically installed on new‑build large tankers, LNG carriers and cruise liners to provide precise low‑speed control during port entry/exit, alongside dynamic positioning for offshore operations. Its retractable feature allows the unit to be withdrawn into the hull when cruising, preserving fuel efficiency.
Manufacturer Datasheet
Datasheet
FU-3000 stern
· 3000.0 kW · Retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
360.0
Diameter (mm)
2900
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (360 kN at 3 000 kW) suitable for large vessels
  • Retractable design reduces hydrodynamic drag when the thruster is not in use
  • Full 360° rotation provides excellent maneuverability and DP capability
  • Robust hydraulic drive system tolerates harsh offshore and ice‑class environments
  • Standardised Kongsberg control interface integrates easily with existing ship automation
Weaknesses
  • Large physical envelope (≈2.9 m propeller diameter) limits installation on smaller hulls
  • Complex retractable mechanism adds maintenance tasks and potential failure points
  • High power rating requires substantial hydraulic/electrical plant capacity
  • Weight and structural loads must be accommodated in vessel design
  • Initial acquisition cost is higher than fixed tunnel thrusters of comparable power
Typical Vessels: Very Large Crude Carrier (VLCC)LNG carrierOffshore supply vessel (OSV)Cruise shipContainer ship (>8 000 TEU)Bulk carrier with DP requirements
Decision Guide: Choose the FU‑3000 when a large vessel needs high thrust for DP or tight‑port maneuvering and can accommodate a retractable unit to minimise drag during transit. Avoid it on vessels with limited hull space, low power budgets, or where simpler fixed tunnel thrusters meet performance needs.
Use Cases: The thruster is commonly installed on deep‑draft tankers, LNG carriers and offshore support ships that require strong stern thrust for dynamic positioning, ice navigation, or rapid reverse manoeuvres in confined ports. Its retractable feature is valuable for vessels that spend long periods underway at speed, allowing the unit to be stowed to reduce resistance.
Manufacturer Datasheet
Datasheet
FU-3500 bow
· 3500.0 kW · Retractable azimuth thruster
Power (kW)
3500
Thrust (kN)
420.0
Diameter (mm)
3300
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Very high power‑to‑size ratio (3.5 MW in a 3.3 m propeller diameter)
  • Full 360° thrust vectoring for superior maneuverability and DP support
  • Retractable design lowers hull resistance during transit, improving fuel efficiency
  • Robust double‑gear hydraulic drive with adaptive sealing reduces leak risk
  • Proven Kongsberg/Rolls‑Royce heritage with extensive field service experience
Weaknesses
  • Complex mechanical and hydraulic systems increase installation cost and maintenance workload
  • Requires dedicated hull space for the retraction mechanism, limiting retrofits on smaller ships
  • Higher initial capital outlay compared with fixed tunnel thrusters of similar power
  • Maintenance intervals (hydraulic fluid, seals, bearing play) are more demanding than simple CP/Fx thrusters
  • Not specifically designed for heavy ice conditions; separate Arctic‑Thruster line is required for polar service
Typical Vessels: VLCC / ULCC TankersLNG carriersCruise shipsOffshore supply & anchor handling tug supply vessels (AHTS)DP2/DP3 platform support vessels
Certifications: DNV GL class approvalABS classification approvalIMO Type Approval
Decision Guide: Choose the FU‑3500 when a vessel needs very high bow thrust for tight port manoeuvring or dynamic positioning and can benefit from reduced drag during cruising thanks to its retractable feature. Avoid it on smaller ships, low‑budget projects, or vessels operating in heavy ice where an Arctic‑Thruster is required.
Use Cases: The thruster is commonly installed on large oil tankers and LNG carriers to assist with berthing in confined ports, on cruise ships for precise docking, and on offshore support vessels that require DP capability while still wanting fuel savings during transit by retracting the unit when not needed.
Manufacturer Datasheet
Datasheet
FU-3500 stern
· 3500.0 kW · Retractable azimuth thruster
Power (kW)
3500
Thrust (kN)
420.0
Diameter (mm)
3300
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Very high power‑to‑thrust ratio (3.5 MW → 420 kN) suitable for large DP vessels
  • Retractable design reduces hull resistance when the unit is not in use, improving fuel efficiency
  • Full 360° azimuth gives excellent maneuverability for docking and offshore operations
  • Proven Kongsberg/ Rolls‑Royce integration with advanced hydraulic control and diagnostics
Weaknesses
  • Large diameter (3.3 m) limits installation to vessels with sufficient hull volume
  • Complex hydraulic system requires regular oil analysis, filtration and skilled maintenance
  • Higher capital cost compared with fixed tunnel thrusters of similar thrust
  • Retractable mechanism adds mechanical wear points that must be inspected during each dry‑dock
Typical Vessels: Offshore Supply Vessel (OSV)Drillship / Jack‑upLNG carrierCruise shipDynamic Positioning research vessel
Decision Guide: Choose if you need maximum thrust for a large DP‑enabled vessel and want the drag‑reduction benefit of a retractable unit. Avoid if hull space is limited, budget constraints preclude high‑cost thrusters, or the vessel operates only at low speeds where a simpler tunnel thruster would suffice.
Use Cases: The FU‑3500 is typically installed on deep‑water offshore support ships and large tankers that require precise station‑keeping during offshore operations, as well as on cruise liners for tight port manoeuvring. Its retractable feature allows the vessel to run efficiently on open sea while still providing high thrust when needed for DP or docking.
Manufacturer Datasheet
Datasheet
FU-4000 bow
· 4000.0 kW · Retractable azimuth thruster
Power (kW)
4000
Thrust (kN)
480.0
Diameter (mm)
3700
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Very high thrust‑to‑power ratio (480 kN at 4 MW) for excellent low‑speed maneuvering
  • Retractable design reduces hydrodynamic resistance and protects the unit in heavy seas or ice
  • Full 360° azimuth rotation enables precise vectoring of thrust for docking, undocking and DP operations
  • Integrated hydraulic control system allows rapid deployment/retraction from bridge consoles
Weaknesses
  • Complex hydraulic/mechanical arrangement leads to higher maintenance effort and cost
  • Large hull penetration required; installation space and structural reinforcement are significant
  • Higher capital cost compared with conventional fixed tunnel thrusters of similar power
  • Seal and bearing wear can be accelerated in abrasive or icy environments, demanding frequent inspections
Typical Vessels: Ultra‑large container shipsCruise linersLNG carriersOffshore support vessels (DP2/DP3)FPSOs and large tankers
Decision Guide: Choose if the vessel needs maximum maneuverability for tight port operations, dynamic positioning or high‑speed transit where drag reduction is valuable. Avoid on smaller ships, budget‑constrained projects, or when a simpler fixed tunnel thruster meets the maneuvering requirements.
Use Cases: The FU‑4000 is typically deployed on mega‑vessels that require powerful bow thrust for berthing in confined ports, DP assistance during offshore operations, and the ability to retract the unit to minimise resistance during open‑water voyages. It is also favoured where thruster protection from fouling or ice impact is required.
Manufacturer Datasheet
Datasheet
FU-4000 stern
· 4000.0 kW · Retractable azimuth thruster
Power (kW)
4000
Thrust (kN)
480.0
Diameter (mm)
3700
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑thrust ratio (4 MW / 480 kN) suitable for large DP vessels
  • Full 360° swivel gives excellent manoeuvrability and bollard pull control
  • Retractable design eliminates hull resistance when the thruster is stowed
  • Hydraulic drive with double‑gearbox provides reliable torque transmission
  • Proven Kongsberg/Rolls‑Royce heritage with extensive field service data
Weaknesses
  • Large installation envelope; requires a sizable stern tunnel and structural reinforcement
  • Complex hydraulic system increases maintenance workload and spare‑part inventory
  • Retractable mechanism adds moving parts that are prone to seal wear and require periodic inspection
  • Higher capital cost compared with fixed tunnel thrusters of similar power
  • Weight and centre‑of‑gravity impact must be carefully assessed during ship design
Typical Vessels: LNG carrier (DP2/3)Offshore supply vesselCruise shipLarge tanker with DP requirementsFloating production storage and offloading unit (FPSO)
Decision Guide: Choose if the vessel needs high thrust, precise 360° steering and wants to minimise drag when the thruster is not in use – typical for DP‑class offshore or LNG ships. Avoid if hull space is limited, budget constraints preclude a hydraulic retractable system, or a simpler fixed tunnel thruster meets the manoeuvring requirements.
Use Cases: The FU-4000 is commonly installed on vessels that perform dynamic positioning, tight port docking, and ice‑class operations where high bollard pull and low drag are critical. It is used on modern LNG carriers for DP maneuvers, offshore support ships during subsea interventions, and cruise liners for berthing in confined harbours.
Manufacturer Datasheet
Datasheet
FU-4500 bow
· 4500.0 kW · Retractable azimuth thruster
Power (kW)
4500
Thrust (kN)
540.0
Diameter (mm)
4100
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Very high power (4.5 MW) and thrust for excellent low‑speed manoeuvring and DP support
  • 360° swivel provides full directional control
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency
  • Compact footprint compared with fixed tunnel thrusters of similar capacity
  • Proven Kongsberg/Rolls‑Royce reliability and global service network
Weaknesses
  • Complex hydraulic and sealing systems increase maintenance workload
  • Higher initial capital cost than conventional fixed tunnel thrusters
  • Requires sufficient hull space and structural reinforcement for the retractable housing
  • Potential for seal wear or propeller damage if retraction/extension cycles are not carefully managed
  • Longer installation time due to integration of retract mechanism
Typical Vessels: Ultra‑large container shipsCrude oil and product tankers (>80 000 dwt)LNG carriersCruise linersOffshore supply vessels with DP capability
Decision Guide: Choose the FU‑4500 when a vessel needs very high bow thrust for port entry, dynamic positioning or ice‑class manoeuvring and can accommodate a retractable unit to gain cruise‑speed drag reduction. Avoid it on smaller ships, vessels with limited hull space, or projects where lower upfront cost and simpler maintenance are higher priorities.
Use Cases: The thruster is typically installed on large ocean‑going vessels that operate in confined ports, require precise low‑speed handling for offshore operations, or need to meet stringent DP performance criteria. Its retractable feature is especially valuable for ships that spend most of their time underway at speed but still demand strong manoeuvring power when docking or during emergency stops.
Manufacturer Datasheet
Datasheet
FU-4500 stern
· 4500.0 kW · Retractable Azimuth Thruster
Power (kW)
4500
Thrust (kN)
540.0
Diameter (mm)
4100
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Very high power and thrust suitable for large DP‑required vessels
  • Retractable design reduces hydrodynamic drag during transit, improving fuel efficiency
  • Full 360° azimuth capability provides excellent maneuverability in confined ports
  • Proven Kongsberg/Rolls‑Royce hydraulic control system with integrated monitoring
  • Standardized dimensions (4.1 m propeller diameter) fit existing hull openings for many newbuilds
Weaknesses
  • Large physical size requires substantial hull penetration and structural reinforcement
  • Higher initial capital cost compared with conventional tunnel thrusters of similar rating
  • Complex hydraulic system increases maintenance workload and spare‑part inventory
  • Weight and space requirements may limit suitability for smaller vessels or retrofits
  • Retractable mechanism adds moving parts that can be prone to wear if not inspected regularly
Typical Vessels: VLCC / ULCC crude carriersUltra‑large container ships (ULCV)LNG/LPG carriers with dynamic positioningOffshore supply and construction vessels (DP3)Large cruise ships requiring precise berthing
Certifications: IMO Type ApprovalDNV Class approval
Decision Guide: Choose if the vessel needs very high bollard‑pull or DP capability, operates in tight ports where drag reduction is valuable, and can accommodate the structural modifications required for a retractable unit. Avoid if the ship’s size, budget or operational profile does not justify the extra power, complexity, or hull alterations.
Use Cases: The FU‑4500 is typically installed on new‑build ultra‑large tankers, container ships, LNG carriers and offshore DP vessels that require both high thrust for maneuvering and reduced resistance during cruising. It is also used on cruise liners where precise docking and low‑drag operation are critical.
Manufacturer Datasheet
Datasheet
FU-5000 bow
· 5000.0 kW · Retractable azimuth thruster
Power (kW)
5000
Thrust (kN)
600.0
Diameter (mm)
4500
Type
retractable
Location
bow
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • 5 MW motor provides up to 600 kN thrust for excellent low‑speed maneuverability
  • Retractable design removes hull resistance when stowed, improving fuel efficiency
  • Full 360° azimuth rotation enables precise vectoring for DP and tight berth handling
  • Integrated hydraulic control compatible with Kongsberg DP consoles
  • Modular construction allows relatively straightforward access for inspection and overhaul
Weaknesses
  • Large tunnel diameter (4.5 m) limits installation to vessels with sufficient hull space
  • High power rating results in significant hydraulic/electrical demand and operating cost
  • Complex retractable mechanism adds inspection intervals and potential failure points
  • Requires dedicated shaft sealing system; seal wear is a critical maintenance item
  • Spare‑part availability can be limited in remote ports compared with conventional tunnel thrusters
Typical Vessels: Ultra Large Container Vessel (ULCV)Very Large Crude Carrier (VLCC)LNG carrierCruise shipOffshore support vessel (OSV)
Decision Guide: Choose if: you need a high‑power bow thruster (>5 MW) with retractable capability to minimise drag on large vessels, and you operate DP or require precise low‑speed manoeuvring. Avoid if: hull space is constrained, budget for installation/maintenance is limited, or a lower‑power conventional tunnel thruster would meet the maneuvering requirements.
Use Cases: Installed in the bow of mega‑size tankers, LNG carriers and cruise ships to provide DP assistance during offshore operations, port entry/exit, and ice‑class navigation where rapid thrust vectoring and reduced drag are essential.
Manufacturer Datasheet
Datasheet
FU-5000 stern
· 5000.0 kW · Retractable Azimuth Thruster
Power (kW)
5000
Thrust (kN)
600.0
Diameter (mm)
4500
Type
retractable
Location
stern
Technical Specifications
Tunnelthrusters
Leistung 200-3.700 kW, Propellerdurchmesser 1.600-2.000 mm, Schub bis 229 kN, verfuegbar in CP (Constant Pitch) und FP (Fixed Pitch)
Azimuth-thrusters
Leistung 330-6.500 kW (mechanical/hybrid), neun Baumgroessen, Zugkraft optimiert fuer Bollard-Pull, 360°-Schwenkung
Arctic Thruster (ARC)
Leistung ab 3 MW bis >10 MW, keine Oel-Meer-Schnittstellen, adaptive Dichtungen, Polar-Class-2 und Icebreaker-7 bis 9 MW
Permanent Magnet (PM) Thrusters
TT-PM 1000 kW (146 kN), TT-PM 1600 kW (229 kN), Effizienzsteigerung 7-13% gegenueber Diesel-Elektrik
Hydraulik-standard
Doppelte Zahnrad-Hydraulik fuer Steuerung/Luefte/Schmierstoff, Doppel-Zylinder mit Druckrohr-Sicherheit, Dichtungs-Tank mit Nachfuel-Kapazitaet
Lagerung
Rollenlager fuer Schubwelle, Schmierung mit Fett, Dichtung an Lagergehausen, Toleranz-Freispiele typisch 0,5-2,0 mm
Product Lines
  • US Azimuth Thruster
  • Arctic Thruster (ARC)
  • TCNS/C Azimuth Thruster (Swing-up/Retractable)
  • Rim Drive Azimuth Thruster (RD-AZ)
  • Tunnel Thruster Type TT/TTH
  • Permanent Magnet Tunnel Thruster (TT-PM)
  • Rim Drive Tunnel Thruster (RD-TT)
  • Underwater Mountable Azimuth Thruster (UUC/UUC-PM)
  • Retractable Azimuth Thruster (UL/ULE)
  • Azipull Thruster (Integrated PM Motor)
Common Failures & Inspection Points
  • Area: Propellerblaetter: Verschleiss, Risse, Verformung, Seewuchsbewuchs
    Check: Sichtpruefung auf Schaedigungen, Freispiel, Blattoberflaeche glatt ohne Kratzer/Dellen. Blattwurzel-O-Ringe auf Verschleiss checken, Spitzzenspiel messen. Bei Zweifeln: 1,5 bar Luftdruck auf VT-Nippel, Seifenblasen-Test auf Oellecks.
  • Area: Propellerwellen-Dichtung: Durchfeuchtuung, Oelaustrittsverlust, Verschleiss
    Check: Sichtpruefung auf Lecks um Wellendichtung, Dichtungs-Hohlraum kontrollieren (bei ARC auto-monitortbar). Dichtklipp-Druck (z.B. via Sensorausgabe) beobachten. Bei 5-Jahres-Revision: Dichtung erneuern. Adaptive Druckregelung pruefen.
  • Area: Lagerfreispiel/Lagerverschleiss: Axiales/Radiales Play ueber Norm, Bohrlochabtrag
    Check: Schieblehren/Zaehler-Lehren: Wellendurchmesser und Bohrungen messen (Sollwert via Hersteller-Datenblatt). Ableseschieber-Ablesungen dokumentieren. Bei Ueberschreitung: Lagerbund/Lagerschalen austauschen. Vibration/Geraeusch waehrend Fahrt beobachten.
  • Area: Hydraulikfluid: Verschmutzung, Feuchtigkeit, Alterung, Farb-/Geruechsveraenderung
    Check: Fluessigskeit-Level im Behaelter pruefen (Sollstand). Farbtest: hell/gelblich OK, trueb/dunkel = Wechsel erforderlich. Partikelzaehlung (falls verfuegbar). Filter nach Herstellerintervall austauschen. Drucktest Hydraulik-Leitung.
  • Area: Hydraulik-Leitungen/Verbindungen: Risse, Lecks, Verformung, korrosive Belaege
    Check: Sichtpruefung aller Schlaeuche, Rohre, Verschraubungen auf Fehler. Trockenheit checken, Korrosion (Rostflecken), Krampfspuren. Hochfrequenz-Undicht-Test bei Bedarf. Leistungsdruck waehrend Fahrt beobachten.
  • Area: Elastomer-Bauteile (O-Ringe, Dichtlippen, Gummistuecke): Hartung, Risse, Quellungserscheinungen
    Check: Visuelle Inspektion aller O-Ringe/Dichtungen auf Verschleiss, Verhaertung, Verformung. Mit Fingerdruck testen (Elastizitaet). O-Ring-Nuten reinigen/oelen mit Getriebeoel (bei 5-Jahres-Revision). Beschaedigte Teile austauschen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Kongsberg, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑size ratio (5 MW in a 4.5 m unit) suitable for large DP vessels
  • Retractable design reduces hull resistance when the thruster is stowed, improving fuel efficiency
  • Full 360° thrust vectoring gives excellent low‑speed maneuverability and redundancy as an auxiliary propulsion source
  • Hydraulic drive system with double‑gear set provides proven reliability and fast response
  • Kongsberg’s global support network and extensive field experience
Weaknesses
  • Large diameter requires significant hull penetration and structural reinforcement
  • Higher capital cost compared with fixed tunnel thrusters of similar thrust
  • Complex maintenance – hydraulic seals, shaft bearings and retractable mechanism need regular inspection
  • Weight and volume can affect vessel stability margins, especially on smaller platforms
  • Spare‑part lead times may be longer in remote ports without Kongsberg service agents
Typical Vessels: Offshore Support Vessels (OSV)DP2/DP3 Container & Bulk CarriersLNG carriers with stern‑mounted DP systemsCruise ships requiring high maneuverabilityIce‑class research vessels when fitted with Arctic‑compatible seals
Certifications: DNV
Decision Guide: Choose the FU‑5000 when you need a high‑thrust, retractable stern thruster for DP or tight‑port operations and can accommodate its size and maintenance regime. Avoid it on vessels with limited hull space, very low budget projects, or where a simpler fixed tunnel thruster would meet performance needs.
Use Cases: The FU‑5000 is typically installed on large offshore supply ships and high‑value cargo carriers that require precise station‑keeping during offshore operations, as well as on cruise liners for tight docking maneuvers. Its retractable feature allows the unit to be stowed during open‑sea transit to minimise drag, while providing powerful thrust when deployed for dynamic positioning or emergency propulsion.
Manufacturer Datasheet
Datasheet

Brunvoll

65
Brunvoll AR-63-LTC-1800
AR-63-LTC-1800
1800 kW · 1800.0 kW · Seawater · Electric Retractable Azimuth
Common Failures & Inspection Points
  • Retraction cylinder seal failure
  • Gear bearing wear
  • Thruster well corrosion
Service: Brunvoll azimuth retractable; inspect thruster well coating at drydock.
Spare Parts: Brunvoll: Getriebeöl und Dichtungen an Bord. Lead time: 3-6 Wochen.
Strengths
  • Improved maneuverability in tight spaces
  • Increased propulsion efficiency due to optimized thruster placement
  • Reduced drag when thruster is retracted, enhancing vessel speed
  • Enhanced control and precision during docking and undocking operations
  • Potential for reduced fuel consumption due to optimized propulsion system
Weaknesses
  • Higher initial investment compared to fixed thruster systems
  • Increased complexity requiring more sophisticated maintenance
  • Potential for retraction cylinder seal failure and gear bearing wear
  • Thruster well corrosion can be a significant maintenance issue if not properly addressed
  • Requires regular inspection and maintenance to ensure optimal performance
Typical Vessels: Cruise ShipsFerriesOffshore Supply VesselsLuxury Yachts
Certifications: DNVABS
Decision Guide: Choose if: high maneuverability and propulsion efficiency are critical, and the vessel operates in tight spaces or requires precise control. Avoid if: budget constraints are a significant factor, or if the vessel's operational profile does not justify the complexity and cost of a retractable azimuth thruster.
Use Cases: Typically deployed on vessels that require high maneuverability and propulsion efficiency, such as cruise ships, ferries, and offshore supply vessels, where the ability to operate in tight spaces and maintain precise control is essential.
Datasheet
Brunvoll AR-100 bow unverified
· 100.0 kW · retractable azimuth thruster
Power (kW)
100
Thrust (kN)
13.0
Diameter (mm)
470
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (13 kN at only 100 kW).
  • Retractable design reduces draft and protects the propeller in shallow water operations.
  • Compact 470 mm diameter fits vessels with limited hull space.
  • Available with hydraulic or electric drive options for system flexibility.
  • Optimised blade geometry delivers low vibration and noise levels.
Weaknesses
  • Maximum thrust may be insufficient for high‑power DP vessels or very large ships.
  • Retractable mechanism adds mechanical complexity and maintenance requirements.
  • 100 kW power demand can require dedicated generator capacity on smaller vessels.
  • Initial purchase cost is higher than basic tunnel thrusters of similar power.
  • Spare‑part availability may be limited in remote ports.
Typical Vessels: Offshore Supply VesselPlatform Supply VesselResearch VesselFerryMultipurpose Cargo Ship
Certifications: DNV
Decision Guide: Choose if: you need a compact, high‑thrust bow thruster for DP or close‑quarter manoeuvring and the vessel operates in shallow water where a retractable unit protects the propeller. Avoid if: the vessel requires thrust well above 13 kN, prefers a simpler fixed tunnel thruster, or wants to minimise mechanical complexity and maintenance.
Use Cases: The AR-100 is typically installed on offshore supply and platform support vessels that require dynamic positioning for station‑keeping near rigs, as well as research ships and ferries operating in congested ports where a retractable bow thruster provides both manoeuvring power and protection against grounding.
Datasheet
Brunvoll AR-100 stern unverified
· 100.0 kW · Retractable azimuth thruster
Power (kW)
100
Thrust (kN)
13.0
Diameter (mm)
470
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (13 kN @ 100 kW)
  • Retractable design reduces hull resistance and improves fuel efficiency when the thruster is stowed
  • Compact 470 mm diameter suitable for vessels with limited draft
  • Electric drive provides low noise and lower emissions compared with diesel‑driven units
  • External mounting simplifies inspection and routine maintenance
Weaknesses
  • Higher initial purchase and installation cost than fixed tunnel thrusters
  • Mechanical retraction system adds complexity and potential failure points
  • Limited maximum thrust compared with larger, non‑retractable units
  • Requires integration with vessel control/DP systems and dedicated power supply
  • May be less suitable for ice‑class vessels where the retraction mechanism could be stressed
Typical Vessels: Offshore supply vesselPlatform support vesselCruise shipFerryContainer feeder
Certifications: DNV
Decision Guide: Choose if you need a high‑maneuverability stern thruster on a vessel with limited draft and want to minimise drag during normal cruising. Avoid if budget constraints favour a simpler fixed tunnel thruster, or if the vessel operates in harsh ice conditions where a retractable unit could be vulnerable.
Use Cases: Commonly installed on offshore support ships for precise berthing alongside platforms, cruise liners for port manoeuvring, and ferries that require rapid low‑speed positioning while maintaining fuel efficiency during transit.
Datasheet
Brunvoll AR-150 bow unverified
· 150.0 kW · retractable azimuth thruster
Power (kW)
150
Thrust (kN)
19.5
Diameter (mm)
505
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈19.5 kN at 150 kW)
  • Retractable design eliminates hydrodynamic resistance during transit, improving fuel efficiency
  • Compact footprint allows installation on vessels with limited bow space
  • Low vibration and noise due to balanced propeller geometry
  • Quick deployment/retraction mechanism aids rapid maneuvering in ports
Weaknesses
  • Mechanical retract system adds complexity and maintenance requirements
  • Higher upfront cost compared with fixed‑pitch bow thrusters of similar power
  • Thrust is lower than larger fixed units, limiting effectiveness on very large vessels
  • Installation requires reinforced hull openings and space for the retraction housing
  • Potential reliability concerns in harsh ice or debris environments
Typical Vessels: Platform Supply Vessel (PSV)Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS)Small Container ShipResearch / Survey Vessel
Certifications: DNV
Decision Guide: Choose the AR‑150 when you need strong maneuverability in confined ports or DP support and want to minimise drag during open‑water cruising. It is especially attractive for offshore supply vessels where space is limited and fuel efficiency matters. Avoid if budget constraints dominate, the vessel operates primarily in ice‑prone waters, or a simpler fixed thruster meets the required thrust levels.
Use Cases: The AR‑150 is typically deployed on offshore support ships that frequently shuttle between ports and rigs, requiring rapid bow‑side positioning for mooring operations. Its retractable feature allows the ship to cruise at higher speeds without the penalty of permanent thruster drag, making it ideal for vessels that alternate between high‑speed transits and precise low‑speed maneuvers.
Datasheet
Brunvoll AR-150 stern unverified
· 150.0 kW · retractable azimuth thruster
Power (kW)
150
Thrust (kN)
19.5
Diameter (mm)
505
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈19.5 kN at 150 kW) for a vessel of its size
  • Retractable design reduces hydrodynamic resistance and protects the propeller when cruising
  • 360° rotatable nozzle provides excellent maneuverability for dynamic positioning or tight berthing
  • Compact diameter (505 mm) fits in limited hull spaces, especially on medium‑size offshore vessels
  • Brunvoll’s proven reliability and low acoustic signature are advantageous for crew comfort
Weaknesses
  • Mechanical complexity of the retractable mechanism increases maintenance intervals compared with fixed tunnel thrusters
  • Maximum thrust is lower than that of larger fixed tunnel units, limiting use on high‑power tugs or ice‑class vessels
  • Initial procurement cost is higher due to the azimuth and retraction gear
  • Potential for fouling when the unit is extended in warm waters; requires regular cleaning
  • Installation requires precise hull integration and may affect internal layout
Typical Vessels: Platform Supply Vessel (PSV)Offshore Support VesselAnchor Handling Tug Supply (AHTS) – medium sizeFerry or Ro‑Ro vessel with moderate maneuvering needsWorkboat / Crew transfer vessel
Decision Guide: Choose the AR-150 when you need a compact, high‑maneuverability thruster that can be retracted to preserve cruising efficiency – typical for offshore supply ships, ferries and workboats requiring dynamic positioning or tight berth handling. Avoid it on vessels demanding very high thrust (large tugs, ice‑class ships) or where maintenance resources are limited, as the retractable mechanism adds complexity.
Use Cases: The AR-150 is commonly installed on the stern of offshore supply vessels to provide precise station‑keeping during cargo transfer, to assist in low‑speed harbor maneuvers, and to serve as an emergency stop thruster that can be retracted when sailing at speed. It also sees use on ferries for rapid docking and undocking cycles where drag reduction is beneficial.
Datasheet
Brunvoll AR-200 bow unverified
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
26.0
Diameter (mm)
540
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (26 kN at 200 kW)
  • Retractable design reduces hull resistance and improves fuel efficiency when the thruster is stowed
  • Compact diameter fits vessels with limited bow space
  • Integrated control system provides precise low‑speed manoeuvring
  • Sealed, low‑maintenance unit suitable for harsh marine environments
Weaknesses
  • Retractable mechanism adds mechanical complexity and requires regular inspection
  • Maximum thrust lower than larger fixed‑pitch thrusters of the same power class
  • Higher upfront cost compared with conventional fixed bow thrusters
  • Requires dedicated retraction housing within the hull, reducing internal volume
  • Potential for reduced reliability in extreme ice or debris conditions
Typical Vessels: Offshore supply vesselsPlatform support shipsMedium‑size product tankers (up to ~30 kDWT)Bulk carriers and general cargo vesselsFerries and cruise ship tenders
Decision Guide: Choose if you need high manoeuvrability in confined ports, want to minimise drag when the thruster is not in use, or have limited bow space for a fixed unit. Avoid if your vessel can accommodate a larger fixed‑pitch thruster with higher absolute thrust or operates in extreme ice where a retractable mechanism may be vulnerable.
Use Cases: The AR-200 is typically installed on vessels that require precise low‑speed handling for berthing, unberthing and dynamic positioning support, especially when operating in tight harbours or offshore terminals. Its retractable feature makes it attractive for ships that also prioritize cruising efficiency.
Datasheet
Brunvoll AR-200 stern unverified
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
26.0
Diameter (mm)
540
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈26 kN @ 200 kW) for strong maneuverability
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency
  • Compact footprint suitable for vessels with limited aft space or low draft requirements
  • Low vibration and noise levels thanks to Brunvoll’s optimized propeller geometry
  • Compatible with DP‑2 systems for precise station keeping
Weaknesses
  • Mechanical retraction mechanism adds complexity and requires regular inspection
  • Higher upfront cost compared with fixed tunnel thrusters of similar power
  • Installation demands reinforced hull sections and space for the retracting housing
  • Potential slight loss in propulsive efficiency when fully extended versus a dedicated fixed thruster
  • Limited to vessels that can accommodate the required shaft line geometry
Typical Vessels: Offshore supply vesselDP‑enabled tugboatPlatform support vesselFerry with dynamic positioningResearch or survey ship
Certifications: DNV GL class approvalABS type approval
Decision Guide: Choose if you need strong maneuverability and the ability to retract the thruster for reduced drag during cruising, especially on DP‑equipped offshore or support vessels. Avoid if budget constraints are tight, hull form cannot accommodate the retraction housing, or a simpler fixed tunnel thruster meets all operational requirements.
Use Cases: The AR‑200 is typically installed on offshore supply ships that require precise positioning while working near platforms, as well as DP‑tugs that need both high thrust and reduced resistance when transiting. It is also favored on low‑draft ferries operating in shallow ports where a retractable unit prevents hull fouling and improves speed.
Datasheet
Brunvoll AR-300 bow unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
39.0
Diameter (mm)
610
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈39 kN at 300 kW) gives excellent low‑speed manoeuvrability
  • Retractable design reduces hull resistance and protects the propeller when not in use
  • Compact footprint fits into tight bow spaces on medium‑size vessels
  • Integrated hydraulic/pneumatic actuation allows rapid deployment and stowage
  • Proven DNV/ABS class approval ensures compliance with major classification societies
Weaknesses
  • Higher initial purchase price compared with fixed‑pitch bow thrusters of similar power
  • More complex mechanical and hydraulic systems increase maintenance requirements
  • Seal and bearing wear can be an issue in harsh offshore environments, requiring regular inspection
  • Installation requires precise hull integration; not suitable for vessels lacking adequate bow space
  • Limited to vessels where the added weight and volume of the retraction mechanism are acceptable
Typical Vessels: Platform Supply Vessel (PSV)Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS) – smaller unitsResearch / Survey vesselsFerries and small cruise ships requiring enhanced docking capability
Certifications: DNVABS
Decision Guide: Choose if: you need high manoeuvring power in confined ports or for DP support, want to minimise cruising resistance, and have sufficient bow space for a retractable unit. Avoid if: budget constraints dominate, vessel size limits installation, or the operational profile rarely requires thruster use.
Use Cases: The AR‑300 is typically deployed on offshore supply vessels operating near platforms where precise positioning and quick docking are critical, as well as on research ships that need to hold station in tight harbours. Its retractable feature makes it popular for vessels that spend long periods underway at speed but still require strong low‑speed thrust when approaching terminals.
Datasheet
Brunvoll AR-300 stern unverified
· 300.0 kW · Hydraulic retractable azimuth thruster
Power (kW)
300
Thrust (kN)
39.0
Diameter (mm)
610
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈13 kN per 100 kW)
  • Retractable design reduces draft, hull resistance and protects the unit in shallow water
  • Compact 610 mm diameter suitable for vessels with limited beam space
  • Variable‑pitch propeller provides fine thrust control for DP operations
  • Integrated hydraulic drive simplifies installation on existing vessel systems
Weaknesses
  • Maximum thrust (39 kN) may be insufficient for large DP2/DP3 vessels
  • Retract/extend mechanism adds mechanical complexity and maintenance requirements
  • Hydraulic system requires additional pumps, reservoirs and controls
  • Higher capital cost compared with fixed tunnel thrusters of similar power
  • Limited to stern installation; not suitable where bow thruster space is required
Typical Vessels: Platform Supply VesselAnchor Handling Tug SupplyOffshore Support VesselResearch VesselCruise Ship Tender
Certifications: DNV
Decision Guide: Choose if the vessel needs high manoeuvrability and DP capability while operating in shallow water or wants to minimise hull resistance; the retractable feature protects the thruster and reduces draft. Avoid if budget is tight, thrust requirements exceed 39 kN, or a simpler fixed tunnel thruster would meet operational needs.
Use Cases: Commonly installed on offshore support ships for dynamic positioning during offshore loading/offloading, anchor handling operations where shallow drafts are encountered, research vessels requiring precise station‑keeping, and cruise ship tenders that need both high thrust and the ability to retract in port berths.
Datasheet
Brunvoll AR-400 bow unverified
· 400.0 kW · retractable azimuth thruster
Power (kW)
400
Thrust (kN)
52.0
Diameter (mm)
680
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (52 kN from 400 kW) for strong manoeuvring capability
  • Retractable design reduces drag and protects the propeller in open‑water operation
  • Compact installation footprint suitable for vessels with limited bow space
  • Integrated control system compatible with most DP and bridge control consoles
  • Class‑approved (DNV GL, ABS), facilitating certification on new builds
Weaknesses
  • Higher capital cost compared with fixed ducted thrusters of similar power
  • More moving parts increase maintenance intervals and require skilled service personnel
  • Installation requires hull penetration and sealing, adding complexity to retrofits
  • Thrust may drop slightly at very low RPM due to duct‑flow losses when fully deployed
  • Retract/extend mechanism adds weight high in the bow, affecting vessel trim if not managed
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS)Platform Support VesselDP‑class Shuttle TankerCruise Ship (for port manoeuvring)
Certifications: DNV GL class approvalABS class approval
Decision Guide: Choose if you need strong bow thrust in a compact, retractable package for DP or tight‑port operations and are willing to accept higher upfront cost and maintenance complexity. Avoid if the vessel operates primarily in open water where a fixed thruster would suffice, budget constraints dominate, or the hull layout cannot accommodate the required penetration.
Use Cases: The AR‑400 is typically installed on offshore support vessels that require precise station‑keeping during platform transfers, AHTS ships handling anchors and rigs in confined harbours, and DP‑equipped tankers needing extra manoeuvring power while keeping drag low during transit. It is also used on cruise liners for tight docking maneuvers where retractability protects the unit when cruising.
Datasheet
Brunvoll AR-400 stern unverified
· 400.0 kW · retractable azimuth thruster
Power (kW)
400
Thrust (kN)
52.0
Diameter (mm)
680
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈52 kN @ 400 kW)
  • Retractable design reduces hull drag when not in use
  • Compact diameter (680 mm) fits into limited hull spaces
  • Optimised for DP operations with rapid 360° azimuth control
  • Low vibration and noise compared with conventional propellers
Weaknesses
  • Mechanical complexity of the retractable mechanism increases maintenance
  • Higher upfront cost than fixed tunnel thrusters
  • Requires dedicated hydraulic/pneumatic power supply
  • Potential for cavitation at high RPMs if not properly matched to hull form
  • Limited to stern installation; not interchangeable with bow locations
Typical Vessels: Offshore Supply VesselDP‑2/DP‑3 Platform Support VesselLNG CarrierTanker (especially those requiring DP)Cruise Ship (for enhanced maneuverability)
Certifications: DNV GL class approval
Decision Guide: Choose if you need high thrust for dynamic positioning, want to minimise drag when the thruster is stowed, and have space constraints that favour a retractable unit. Avoid if budget is tight, maintenance resources are limited, or a simpler fixed tunnel thruster meets your maneuvering requirements.
Use Cases: Commonly installed on offshore support vessels for precise station‑keeping during subsea operations, on tankers and LNG carriers to aid harbor entry/exit under low wind conditions, and on cruise ships for tight port manoeuvring while keeping hull resistance low when cruising.
Datasheet
Brunvoll AR-500 bow unverified
· 500.0 kW · Retractable azimuth thruster
Power (kW)
500
Thrust (kN)
65.0
Diameter (mm)
750
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (65 kN at 500 kW) for excellent low‑speed manoeuvring
  • Retractable design reduces hydrodynamic resistance when not in use, improving fuel efficiency
  • Compact installation footprint suitable for vessels with limited hull space
  • Low noise and vibration levels thanks to optimized propeller geometry
  • Integrated control system compatible with DP2/DP3 dynamic positioning
Weaknesses
  • Higher capital cost compared with fixed bow thrusters of similar power
  • More complex mechanical retraction mechanism increases maintenance requirements
  • Maximum thrust lower than larger fixed units, limiting use on very large vessels
  • Requires dedicated shaft tunnel and space for hydraulic/electrical actuation equipment
  • Potential for retraction‑deployment failure if not inspected regularly
Typical Vessels: Offshore supply vessel (OSV)Dynamic positioning vessel (DP2/DP3)Cruise shipProduct tanker (up to ~30 k DWT)Bulk carrier (mid‑size, up to ~40 k DWT)
Certifications: DNV GL class approvalABS classificationLloyd's Register notationIMO Type Approval
Decision Guide: Choose if you need a high‑performance bow thruster that can be retracted to save fuel and reduce hull resistance, especially on vessels requiring dynamic positioning or frequent port manoeuvring. Avoid if budget is tight, the vessel does not benefit from drag reduction, or a simpler fixed thruster meets the thrust requirements.
Use Cases: The AR‑500 is typically deployed on offshore support ships for precise station‑keeping during drilling operations, on cruise liners for rapid docking and undocking, and on mid‑size tankers/bulk carriers to aid in tight‑harbour manoeuvres while being retracted during open‑water transit to improve fuel economy.
Datasheet
Brunvoll AR-500 stern unverified
· 500.0 kW · retractable azimuth thruster
Power (kW)
500
Thrust (kN)
65.0
Diameter (mm)
750
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈65 kN at 500 kW) for strong maneuvering and DP capability
  • Retractable design reduces hull resistance and protects the propeller in ice or debris
  • Compact 750 mm diameter fits vessels with limited aft space
  • Robust marine‑grade construction suitable for harsh offshore environments
  • Modular maintenance layout allows relatively quick overhauls
Weaknesses
  • Complex hydraulic/electrical drive system increases installation and maintenance cost
  • Higher upfront price compared with fixed tunnel thrusters of similar power
  • Requires a dedicated 500 kW power supply and space for control electronics
  • Installation constraints – hull must accommodate retraction mechanism and sealing
  • Potential noise and vibration at full‑load operation
Typical Vessels: Offshore Support Vessel (OSV)Anchor Handling Tug Supply (AHTS)Dynamic Positioning vesselCruise shipLarge ferryLNG carrier (maneuvering aid)
Certifications: DNV
Decision Guide: Choose if you need high thrust for DP or tight‑port manoeuvring and want the drag‑reduction benefit of a retractable unit. Avoid if budget is limited, the vessel has ample space for a fixed tunnel thruster, or the operational profile does not require retraction (e.g., open‑sea transit only).
Use Cases: Commonly installed on offshore supply vessels and DP‑class ships to provide precise station‑keeping during drilling support, ROV deployment, or cargo handling. Also used on cruise liners and ferries for rapid docking and undocking in congested ports, and on ice‑strengthened ships where the thruster can be withdrawn to avoid damage from ice floes.
Datasheet
Brunvoll AR-600 bow unverified
· 600.0 kW · retractable azimuth thruster
Power (kW)
600
Thrust (kN)
78.0
Diameter (mm)
820
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈78 kN at 600 kW) gives strong maneuvering capability.
  • Retractable design reduces drag and protects the unit during open‑sea voyages.
  • Compact installation footprint fits in limited bow spaces on medium‑size vessels.
  • Integrated control system allows precise thrust vectoring for docking and DP support.
  • Proven reliability in offshore supply and ferry applications.
Weaknesses
  • More complex hydraulic/mechanical retract mechanism increases maintenance requirements.
  • Higher upfront cost compared with fixed tunnel thrusters of similar power.
  • Seal wear and corrosion risk in the retractable housing demand regular inspections.
  • Installation may require hull reinforcement, adding to shipyard time and expense.
  • Limited redundancy if only a single bow unit is fitted; failure impacts maneuverability.
Typical Vessels: Offshore Supply VesselPlatform Supply VesselFerryCruise Ship (mid‑size)Container Ship (up to ~150 m LOA)
Decision Guide: Choose if you need strong bow thrust on a vessel where hull drag must be minimised during transit, such as offshore supply or ferry operations, and you can accommodate the extra maintenance of a retractable unit. Avoid if budget is tight, the vessel has ample space for a simpler fixed tunnel thruster, or you require multiple redundant bow units.
Use Cases: The AR-600 is typically installed on vessels that perform frequent port entries, dynamic positioning tasks, or need rapid turnaround in confined waterways. Its retractable feature allows it to be stowed during long transits, preserving fuel efficiency while still providing the high thrust needed for precise docking and DP‑assisted operations.
Datasheet
Brunvoll AR-600 stern unverified
· 600.0 kW · retractable azimuth thruster
Power (kW)
600
Thrust (kN)
78.0
Diameter (mm)
820
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (78 kN @ 600 kW) provides strong maneuvering capability.
  • Retractable design removes the propeller from the flow when not in use, reducing hull resistance and fuel consumption.
  • Compact 820 mm diameter fits vessels with limited stern space or shallow draft constraints.
  • Integrated hydraulic drive and control system is compatible with DP2/DP3 requirements for precise station‑keeping.
  • Norwegian engineering proven in harsh North Sea environments; low vibration and noise levels.
Weaknesses
  • Complex retractable mechanism raises initial purchase price and maintenance workload compared with fixed thrusters.
  • Installation requires a dedicated hull opening and reinforcement, limiting retrofit applicability on existing ships.
  • Hydraulic system adds weight high in the vessel, potentially affecting stability if not properly accounted for.
  • Thrust efficiency can decline at very low RPMs relative to a fixed propeller of similar size.
  • Spare‑part inventory is specific to Brunvoll; lead times may be longer than for more common generic thrusters.
Typical Vessels: Platform Supply VesselOffshore Construction VesselWind Farm Installation VesselCruise Ship (maneuvering)Ferry
Decision Guide: Choose if you need high thrust in a compact package, require retractability to minimise drag during transit, and operate DP or precise maneuvering tasks on offshore vessels. Avoid if budget constraints favour simpler fixed thrusters, the vessel lacks space for the required hull opening, or maintenance resources are limited.
Use Cases: The AR-600 is commonly deployed on DP‑equipped platform supply and construction ships for station‑keeping alongside offshore platforms, on wind farm installation vessels during turbine placement, and on cruise ships or ferries for low‑speed port maneuvering and emergency thrust when the main propeller is unavailable.
Datasheet
Brunvoll AR-750 bow unverified
· 750.0 kW · retractable azimuth thruster
Power (kW)
750
Thrust (kN)
97.5
Diameter (mm)
925
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (97.5 kN at 750 kW) gives strong manoeuvring capability.
  • Retractable design eliminates hull resistance and protects the propeller when cruising, improving fuel efficiency.
  • Compact 925 mm diameter fits medium‑size vessels with limited bow space.
  • Brunvoll’s proven reliability and integrated control system simplify DP integration.
  • Quick deployment/retraction reduces time spent in port maneuvers.
Weaknesses
  • Retractable mechanism adds mechanical complexity and requires regular maintenance.
  • Higher initial capital cost compared with fixed‑pitch bow thrusters of similar power.
  • Installation needs a dedicated retraction tube, limiting suitability for vessels without sufficient hull volume.
  • Potential for fouling or damage when the unit is extended in debris‑rich waters.
  • Power consumption is significant; vessels must have adequate electrical generation capacity.
Typical Vessels: Offshore supply vesselCruise shipFerry / Ro‑RoContainer feederLNG carrier (mid‑size)Multipurpose bulk carrier
Decision Guide: Choose the AR-750 if you need strong bow thrust for tight port operations or dynamic positioning and want to preserve cruising efficiency with a retractable unit. Avoid it when budget constraints, maintenance simplicity, or lack of hull space for a retraction tube are primary concerns.
Use Cases: The AR‑750 is typically deployed on vessels that require precise low‑speed manoeuvring in confined harbours, dynamic positioning for offshore support tasks, and frequent docking/undocking cycles such as cruise ships, ferries, and supply vessels. Its retractable feature also makes it attractive for ships that spend long periods at sea where drag reduction is valuable.
Datasheet
Brunvoll AR-750 stern unverified
· 750.0 kW · Retractable azimuth thruster
Power (kW)
750
Thrust (kN)
97.5
Diameter (mm)
925
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (97.5 kN at 750 kW)
  • Retractable design reduces hull resistance and fuel consumption when the thruster is not needed
  • Compact 925 mm propeller diameter fits vessels with limited stern space
  • Independent 360° steering enhances maneuverability and DP performance
  • Hydraulic drive offers smooth, low‑vibration operation
Weaknesses
  • Complex hydraulic and retraction mechanisms increase maintenance requirements
  • Thrust is lower than that of fixed tunnel thrusters of comparable power for pure bollard pull tasks
  • Retract/extend system adds weight and occupies internal volume at the stern
  • Higher upfront capital cost versus conventional fixed thrusters
  • Potential reliability issues if retraction mechanism is not regularly serviced
Typical Vessels: Offshore Supply VesselCruise ShipContainer ShipLNG CarrierFerry
Certifications: DNVABS
Decision Guide: Choose if the vessel requires high maneuverability, dynamic positioning or frequent low‑speed operations and you want to minimise drag when the thruster is idle. Avoid if budget constraints limit capital outlay, maintenance resources are scarce, or the ship does not need a stern thruster for its operational profile.
Use Cases: The AR-750 is typically deployed on DP2/DP3 offshore vessels for precise station‑keeping, on cruise ships and ferries to aid berthing in tight ports, and on container/LNG carriers to improve turning circles and emergency stop capability while allowing the thruster to be retracted during normal cruising.
Datasheet
Brunvoll AR-1000 bow unverified
· 1000.0 kW · retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
130.0
Diameter (mm)
1100
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈130 kN at 1 MW) gives excellent low‑speed manoeuvrability.
  • Retractable design reduces hull resistance and fuel consumption when the thruster is not in use.
  • Integrated control system compatible with DP2/DP3 dynamic positioning packages.
  • Robust stainless‑steel housing and sealed bearing arrangement for marine corrosion resistance.
  • Low acoustic signature, suitable for noise‑sensitive operations such as offshore wind farm installation.
Weaknesses
  • Higher capital cost compared with fixed bow thrusters of similar power.
  • Requires dedicated hull space and a watertight penetration for the retraction mechanism.
  • More complex maintenance due to moving hydraulic and bearing assemblies.
  • Performance can be limited in very shallow water when the unit cannot be fully deployed.
  • Spare‑part logistics may be more demanding on vessels operating far from major ports.
Typical Vessels: Offshore supply vesselDynamic positioning (DP2/DP3) vesselCruise shipLNG carrierContainer shipWind‑farm installation vessel
Certifications: DNVGLIMO Type Approval
Decision Guide: Choose if: you need high thrust for precise low‑speed manoeuvring, operate a DP‑equipped offshore or cruise vessel, and want to minimise cruising drag. Avoid if: hull space is limited, budget constraints preclude the higher upfront cost, or the vessel will spend most of its time in very shallow water where retraction cannot be used.
Use Cases: The AR-1000 is typically deployed on offshore support ships that require rapid sideways thrust for station‑keeping during subsea operations, on cruise liners for tight port manoeuvring, and on large carriers that benefit from reduced drag when the thruster is retracted during long voyages.
Datasheet
Brunvoll AR-1000 stern unverified
· 1000.0 kW · retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
130.0
Diameter (mm)
1100
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈130 kN at 1 MW) suitable for DP operations
  • Retractable design reduces drag when the thruster is not in use, improving fuel efficiency
  • Compact footprint allows installation on vessels with limited stern space
  • Fast deployment and retraction via hydraulic actuation
  • Proven reliability of Brunvoll’s marine‑grade bearings and seal systems
Weaknesses
  • Complex mechanical system increases maintenance requirements and spare‑part inventory
  • Higher upfront cost compared with fixed propeller thrusters of similar power
  • Requires sufficient hull volume for retraction mechanism, limiting retrofit options
  • Potential for increased noise and vibration at high thrust settings
  • Performance may drop off at very low ship speeds relative to a conventional fixed propeller
Typical Vessels: Platform Supply Vessel (PSV)Offshore Support Vessel (OSV)Anchor Handling Tug Supply (AHTS)Dynamic Positioning vesselCruise ship stern thruster
Certifications: DNV
Decision Guide: Choose if the vessel needs high thrust for dynamic positioning, frequent close‑quarter maneuvers, and benefits from reduced drag when the thruster is retracted. Avoid if budget constraints preclude the higher capital cost or if the hull form cannot accommodate a retractable unit.
Use Cases: Commonly installed on offshore supply and support ships that perform DP‑critical tasks such as wind‑farm installation, subsea construction, and port manoeuvring; also used on cruise liners for stern thrust during docking while being retracted during cruising to save fuel.
Datasheet
Brunvoll AR-1200 bow unverified
· 1200.0 kW · retractable azimuth thruster
Power (kW)
1200
Thrust (kN)
156.0
Diameter (mm)
1240
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈156 kN @ 1.2 MW)
  • Retractable design lowers hydrodynamic resistance during transit
  • 360° thrust vectoring improves low‑speed maneuverability and DP capability
  • Compact installation footprint suitable for vessels with limited hull space
  • Proven reliability on offshore support vessels and large tankers
Weaknesses
  • Complex retractable mechanism increases maintenance requirements
  • Higher upfront cost compared with fixed tunnel thrusters
  • Spare‑part logistics can be more demanding due to specialized components
  • Installation requires hull penetration and structural reinforcement
  • Potential for reduced thrust when partially retracted in heavy sea states
Typical Vessels: Offshore Supply Vessels (OSV)LNG carriersCruise shipsContainer vesselsLarge tankers (VLCC, ULCC)DP2/DP3 equipped vessels
Certifications: DNVGL Type Approval
Decision Guide: Choose if you need high maneuverability and want to minimise transit resistance on a vessel that frequently operates in tight ports or requires dynamic positioning. Avoid if budget constraints favour simpler fixed thrusters, or if the vessel’s operational profile involves low speeds where retractable benefit is marginal.
Use Cases: Commonly installed on vessels requiring strong bow thrust for harbor assistance, dynamic positioning, and ice‑class operations; the unit is retracted during open‑water cruising to improve fuel efficiency.
Datasheet
Brunvoll AR-1200 stern unverified
· 1200.0 kW · retractable azimuth thruster
Power (kW)
1200
Thrust (kN)
156.0
Diameter (mm)
1240
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈156 kN at 1 200 kW) suitable for DP and tight‑maneuvering operations
  • Retractable design reduces hull resistance when the thruster is not needed, improving fuel efficiency
  • Compact footprint allows installation on vessels with limited aft space
  • Full 360° rotation gives excellent maneuverability for docking and offshore positioning
  • Proven Brunvoll hydraulic drive system offers good reliability in harsh marine environments
Weaknesses
  • Mechanical complexity of the retractable mechanism increases maintenance requirements
  • Higher initial capital cost compared with fixed bow/stern thrusters of similar power
  • Retract/extend cycle time can be a limitation for rapid‑response maneuvers
  • Noise and vibration levels are higher than some low‑speed screw‑type thrusters
  • Requires dedicated hydraulic power unit and control integration
Typical Vessels: Offshore supply vessel (OSV)Anchor handling tug supply (AHTS)Dynamic positioning vessel (DP2/DP3)Platform supply vessel (PSV)Large cruise ship or ferry with stern maneuvering aid
Certifications: DNVABS
Decision Guide: Choose if you need high thrust for DP or tight‑space docking and want the drag‑reduction benefit of a retractable unit. Avoid if budget constraints favour a simpler fixed thruster, if rapid on‑the‑fly thrust changes are critical, or if vessel design cannot accommodate the retraction mechanism.
Use Cases: The AR‑1200 is typically deployed on offshore support vessels that require dynamic positioning while transiting to rigs, on large cruise ships for precise berth handling, and on tankers or bulk carriers where a retractable stern thruster can be stowed during open‑water cruising to save fuel yet provide powerful maneuvering when entering ports.
Datasheet
Brunvoll AR-1500 bow unverified
· 1500.0 kW · retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
195.0
Diameter (mm)
1450
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈195 kN at 1 500 kW)
  • Retractable design reduces hydrodynamic resistance during transit
  • Compact installation footprint suitable for vessels with limited hull space
  • Integrated control system compatible with DP and ship‑handling consoles
  • Proven reliability on large passenger ships and offshore supply vessels
Weaknesses
  • Higher initial cost and more complex installation than fixed thrusters
  • Additional maintenance of the retractable hoist mechanism
  • Requires sufficient hull thickness and internal space for retraction cavity
  • Potential cavitation at very high thrust settings if not optimally trimmed
  • Longer deployment/retraction time compared with fully exposed units
Typical Vessels: Cruise shipsLNG carriersOffshore supply vessels (OSV)FPSOsLarge container shipsBulk carriersTankers
Certifications: DNVIMO D‑2
Decision Guide: Choose if you need high maneuverability and want to minimise transit drag on a vessel that can accommodate a retractable unit – e.g., cruise ships, LNG carriers, or DP‑equipped offshore vessels. Avoid if budget constraints favour a simpler fixed thruster, the hull cannot provide the required retraction space, or operational profiles rarely demand high thrust.
Use Cases: The AR‑1500 is typically deployed for dynamic positioning, tight port entry/exit maneuvers, and emergency backup propulsion on large passenger vessels and offshore platforms where reduced drag during cruising is critical. It is also used on newbuilds that integrate DP systems for precise station‑keeping.
Datasheet
Brunvoll AR-1500 stern unverified
· 1500.0 kW · retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
195.0
Diameter (mm)
1450
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈195 kN @ 1500 kW) suitable for DP operations
  • Retractable design reduces hull resistance when not in use, improving fuel efficiency
  • Compact diameter (1.45 m) fits vessels with limited stern space
  • Full 360° rotation provides excellent maneuverability in tight ports
  • Integrated control system compatible with most vessel automation platforms
Weaknesses
  • Complex hydraulic/electrical drive increases installation and maintenance effort
  • Higher initial capital cost compared to fixed propellers or conventional thrusters
  • Requires dedicated stern space for retraction mechanism and structural reinforcement
  • Maintenance downtime can be longer due to retractable components
  • Power demand may impact vessel's overall energy management on smaller ships
Typical Vessels: Platform Supply Vessel (PSV)Offshore Support Vessel (OSV)Anchor Handling Tug Supply (AHTS)Dynamic Positioning (DP) vesselsLarge cruise or ferry with tight maneuvering requirements
Certifications: DNV GL class approval
Decision Guide: Choose if: you need high thrust for DP or close‑quarter manoeuvring, want drag reduction when the thruster is not in use, and have sufficient stern space for a retractable unit. Avoid if: budget constraints limit upfront cost, vessel size cannot accommodate the retraction mechanism, or operational profile does not require 360° thrust capability.
Use Cases: The AR-1500 is typically installed on offshore supply ships that must hold position beside rigs, on DP‑class vessels for precise station‑keeping, and on large ferries or cruise ships needing extra maneuvering power in congested harbours. Its retractable feature is especially valued when the vessel spends long periods cruising, allowing drag reduction while still providing powerful thrust when needed.
Datasheet
Brunvoll AR-2000 bow unverified
· 2000.0 kW · Retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
260.0
Diameter (mm)
1800
Type
retractable
Location
bow
Strengths
  • Very high thrust‑to‑power ratio (≈260 kN at 2 MW)
  • Retractable design eliminates hull drag when the unit is raised
  • Full 360° rotation provides excellent maneuverability and DP capability
  • Compact tunnel footprint compared with fixed thrusters of similar power
  • Proven on a range of offshore and large commercial vessels
Weaknesses
  • More complex hydraulic/electrical drive system increases maintenance requirements
  • Higher initial capital cost than conventional fixed tunnel thrusters
  • Requires sufficient hull space and structural reinforcement for the retraction mechanism
  • Seal and bearing wear can be a concern in high‑cycle operations
  • Installation downtime is longer because of integration with hull structure
Typical Vessels: Offshore Supply Vessels (OSV)Drillships / FPSO support vesselsLarge cruise shipsLNG carriers with DP requirementsContainer ships operating in restricted ports
Certifications: IMO Type Approval for Bow ThrustersDNV GL Classification
Decision Guide: Choose if you need high thrust for dynamic positioning, want to minimise hull resistance when the thruster is not in use, and have sufficient bow space for a retractable unit. Avoid if budget constraints favour simpler fixed tunnel thrusters, or if vessel design cannot accommodate the retraction mechanism.
Use Cases: The AR‑2000 is typically installed on offshore support vessels that must hold position beside rigs, on cruise liners needing precise docking in congested harbours, and on large tankers/LNG carriers where reduced drag improves fuel efficiency while still providing emergency maneuvering power.
Datasheet
Brunvoll AR-2000 stern unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
260.0
Diameter (mm)
1800
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (260 kN at 2 MW) suitable for DP‑class vessels
  • Retractable design reduces hydrodynamic drag and protects the unit during transit
  • Compact 1.8 m diameter fits into relatively small hull openings, easing integration
  • Integrated control system compatible with most ship automation platforms
  • Sealed bearing arrangement lowers maintenance intervals
Weaknesses
  • Large power rating demands robust electrical supply and cooling infrastructure
  • Higher initial capital cost compared with fixed tunnel thrusters of similar size
  • Installation requires structural modifications to the stern, limiting retrofit flexibility
  • Cavitation can become an issue at maximum thrust in shallow water conditions
  • Spare‑part logistics may be challenging for vessels operating far from major ports
Typical Vessels: Very Large Crude Carriers (VLCC)LNG carriersCruise shipsOffshore supply vessels (OSV)Large container ships with dynamic positioning requirements
Certifications: DNV GL Type ApprovalABS Approved
Decision Guide: Choose if: you need high thrust for DP operations on a large vessel, want drag reduction when the thruster is not in use, and have space for a retractable unit at the stern. Avoid if: the ship has limited electrical capacity, a strict budget that cannot accommodate higher upfront costs, or requires bow‑thruster capability.
Use Cases: The AR-2000 is typically deployed on deep‑water tankers and LNG carriers to provide precise station‑keeping during loading/offloading, on cruise ships for maneuvering in confined ports, and on offshore support vessels where rapid deployment/retraction improves fuel efficiency during transit.
Datasheet
Brunvoll AR-2500 bow unverified
· 2500.0 kW · retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
325.0
Diameter (mm)
2150
Type
retractable
Location
bow
Strengths
  • Very high thrust‑to‑power ratio (≈130 kN per MW) for rapid manoeuvring
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency
  • Compact footprint fits into limited hull space while providing full 360° thrust vectoring
  • Integrated control and monitoring system compatible with most DP packages
  • Low acoustic signature compared with conventional fixed thrusters
Weaknesses
  • Complex hydraulic/electromechanical retraction mechanism increases installation and maintenance effort
  • Higher upfront cost than a comparable fixed‑pitch bow thruster
  • Requires dedicated hull cut‑out and reinforcement, limiting retrofit options on some vessels
  • Potential for increased wear at the retractable bearing seals, demanding regular inspection
  • Cavitation risk at maximum RPM if not matched with proper propeller design
Typical Vessels: Cruise shipsOffshore supply vessels (OSV)FPSO / offshore platform support vesselsLarge container or bulk carriers requiring DP‑assisted manoeuvringLNG carriers with tight port constraints
Certifications: IMO D-2 Type Approval
Decision Guide: Choose if you need high thrust for a large vessel while keeping hull resistance low – e.g., cruise liners, DP‑operated offshore vessels, or ships that must frequently retract the thruster for speed. Avoid if budget is tight, the vessel does not have space for a retractable unit, or maintenance resources are limited.
Use Cases: The AR-2500 is typically deployed on large passenger and offshore support ships to provide rapid bow‑side thrust for docking, undocking, and dynamic positioning in confined ports or during offshore operations. Its retractable feature allows the vessel to cruise at full speed without the drag penalty of a fixed thruster.
Datasheet
Brunvoll AR-2500 stern unverified
· 2500.0 kW · retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
325.0
Diameter (mm)
2150
Type
retractable
Location
stern
Strengths
  • 2500 kW power rating provides strong maneuvering and DP capability for large vessels
  • Retractable design reduces hydrodynamic resistance during normal cruising, improving fuel efficiency
  • High thrust (325 kN) enables precise station‑keeping and tight turning circles
  • Robust Brunvoll engineering with proven service record in harsh offshore environments
Weaknesses
  • Complex retraction mechanism adds maintenance requirements and potential failure points
  • Installation requires significant hull penetration and internal space for the housing
  • Higher upfront cost compared with fixed tunnel thrusters of similar power
  • Weight and structural reinforcement needs can impact vessel design margins
Typical Vessels: LNG carriersVery large crude carriers (VLCCs)Offshore supply vessels (OSVs) with DPCruise ships requiring high maneuverabilityLarge container ships equipped for dynamic positioning
Certifications: DNV
Decision Guide: Choose if you need a powerful stern thruster that can be hidden to minimise cruise drag and you have the hull space for a retractable unit. Avoid if budget is tight, maintenance resources are limited, or vessel design cannot accommodate the required housing.
Use Cases: The AR‑2500 is typically installed on deep‑draft vessels that require both high thrust for manoeuvring/Dynamic Positioning and low resistance during transit, such as LNG carriers navigating confined ports or offshore rigs where DP is mandatory.
Datasheet
Brunvoll AR-3000 bow unverified
· 3000.0 kW · retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
390.0
Diameter (mm)
2500
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈130 kN/MW) gives strong manoeuvring capability.
  • Retractable design eliminates hull drag when the thruster is stowed, improving fuel efficiency.
  • Compact footprint fits in relatively small bow spaces while still providing DP‑class performance.
  • Integrated control and monitoring system compatible with most ship automation suites.
  • Proven reliability on offshore support vessels operating in harsh sea conditions.
Weaknesses
  • Complex hydraulic/mechanical retraction mechanism increases installation and maintenance effort.
  • Higher capital cost compared with fixed tunnel thrusters of similar power.
  • Requires regular inspection of seals and retractable bearings to avoid water ingress.
  • Limited to hull forms that can accommodate the retraction cavity; not suitable for very narrow bows.
  • Spare‑part inventory is specific to Brunvoll, potentially longer lead times.
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS)Dynamic Positioning (DP) vesselCruise shipPlatform Support Vessel
Certifications: DNV GL class approval
Decision Guide: Choose if you need high manoeuvring power with minimal drag for DP or tight‑berth operations, and the hull can accommodate a retractable unit. Avoid if budget constraints dominate, the vessel has limited bow space, or you prefer a simpler fixed tunnel thruster.
Use Cases: The AR‑3000 is typically installed on offshore support ships that must hold position beside drilling rigs, on cruise liners needing precise docking in congested ports, and on DP‑class vessels where reduced drag while underway improves fuel consumption.
Datasheet
Brunvoll AR-3000 stern unverified
· 3000.0 kW · retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
390.0
Diameter (mm)
2500
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (~130 kN/MW) for strong maneuvering and DP capability
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency
  • Compact footprint suitable for vessels with limited aft space
  • Robust water‑lubricated bearing system lowers maintenance intervals
  • Integrated control package compatible with most DP controllers
Weaknesses
  • Complex retraction mechanism adds weight and requires regular inspection
  • Higher initial capital cost compared with fixed thrusters of similar power
  • Requires dedicated hydraulic/electrical supply and space for the retraction housing
  • Limited to stern installation; not interchangeable with bow locations without redesign
  • Maximum thrust may be lower than some fixed‑pitch, high‑diameter alternatives in extreme conditions
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS)DP2/DP3 Platform Supply VesselWind Farm Installation VesselResearch / Survey Vessel
Decision Guide: Choose if: you need high maneuverability and dynamic positioning with the ability to retract the thruster for reduced drag during long transits; vessel has sufficient aft space for a retraction housing; you value lower in‑service maintenance. Avoid if: budget constraints prohibit higher upfront cost, hull design cannot accommodate the retraction system, or thrust requirements exceed the AR‑3000’s rating under extreme sea states.
Use Cases: The AR‑3000 is typically deployed on offshore support vessels that perform frequent DP operations near platforms, need tight harbor turns, and travel long distances where drag reduction is valuable. It is also used on wind‑farm installation ships for precise station‑keeping during turbine lift operations.
Datasheet
Brunvoll AR-3500 bow unverified
· 3500.0 kW · retractable azimuth thruster
Power (kW)
3500
Thrust (kN)
455.0
Diameter (mm)
2850
Type
retractable
Location
bow
Strengths
  • Very high thrust‑to‑power ratio (≈455 kN at 3.5 MW) suitable for DP2/DP3 operations
  • Retractable design reduces drag and fuel consumption when the thruster is not in use
  • Compact footprint – no permanent protrusion from hull, preserving cargo space
  • Robust sealed bearing system with low maintenance intervals
  • Proven on a range of offshore support vessels and large DP‑required ships
Weaknesses
  • Complex hydraulic/electric drive and retraction mechanism increases initial cost
  • Requires significant internal bow volume for the retracted unit and control gear
  • Installation and alignment are more demanding than fixed tunnel thrusters
  • Potential for hydraulic leaks if maintenance is neglected
  • Higher spare‑part inventory compared with simpler conventional thrusters
Typical Vessels: Offshore Supply Vessels (OSV)Anchor Handling Tug Supply (AHTS) vesselsDrillships and FPSOsLarge container ships with DP requirementsCruise ships operating in restricted ports
Certifications: DNV GL class approvalABS classificationIMO Type Approval for Dynamic Positioning (G8)
Decision Guide: Choose if you need a powerful bow thruster that can be fully retracted to preserve hull efficiency, especially on vessels requiring high‑grade dynamic positioning or frequent tight‑port maneuvers. Avoid if the ship’s bow structure cannot accommodate the retraction system, budget constraints preclude the higher upfront cost, or a simpler fixed tunnel thruster meets the maneuvering requirements.
Use Cases: The AR‑3500 is typically installed on offshore support vessels that perform dynamic positioning while installing subsea equipment, on drillships that need precise station‑keeping during drilling operations, and on large cargo ships that must navigate congested harbours with limited berth space. Its retractable feature also makes it attractive for ice‑class or high‑speed vessels where hull resistance is critical.
Datasheet
Brunvoll AR-3500 stern unverified
· 3500.0 kW · retractable azimuth thruster
Power (kW)
3500
Thrust (kN)
455.0
Diameter (mm)
2850
Type
retractable
Location
stern
Strengths
  • High power‑to‑thrust ratio (3500 kW / 455 kN) suitable for large vessels requiring strong DP capability
  • Retractable design reduces hull resistance when the thruster is not in use, improving fuel efficiency on cruise voyages
  • Integrated Brunvoll control system offers seamless integration with vessel DP and bridge navigation systems
  • Proven reliability of Brunvoll’s hydraulic drive and blade geometry, with a long service history in offshore vessels
  • Large 2 850 mm propeller diameter provides excellent low‑speed thrust for tight port operations
Weaknesses
  • Significant upfront capital cost compared with fixed tunnel thrusters of similar rating
  • Complex hydraulic/mechanical arrangement increases maintenance workload and requires specialised spares
  • Installation demands a sizeable hull opening and reinforcement, affecting construction schedule
  • High full‑load fuel consumption; not ideal for vessels that operate the thruster continuously at low power
  • Limited availability of certified installers in remote shipyards may extend lead times
Typical Vessels: Ultra‑large crude carriers (ULCC)LNG carriers and LPG carriersOffshore supply vessels (OSV) with DP2/DP3 requirementsCruise ships needing low drag when thruster is retractedLarge container ships operating in constrained ports
Decision Guide: Choose if the vessel needs high thrust for dynamic positioning or tight‑maneuvering and can benefit from a retractable unit that reduces drag during normal cruising. Avoid if budget constraints dominate, the ship’s design cannot accommodate the required hull opening, or the operational profile involves continuous low‑speed thruster use where a fixed tunnel thruster would be more economical.
Use Cases: The AR-3500 is typically deployed on deep‑water tankers and LNG carriers that require DP2/DP3 capability for offshore loading/offloading, as well as on large cruise ships navigating congested harbours. It is also favoured on offshore support vessels that need powerful thrust for station‑keeping while maintaining a streamlined hull form when the thruster is retracted.
Datasheet
Brunvoll AR-4000 bow unverified
· 4000.0 kW · retractable azimuth thruster
Power (kW)
4000
Thrust (kN)
520.0
Diameter (mm)
3200
Type
retractable
Location
bow
Strengths
  • Very high thrust (520 kN) for a 4 MW unit, enabling precise low‑speed manoeuvring on large vessels
  • Retractable design reduces drag and fuel consumption during normal sailing
  • Compact installation footprint suitable for crowded bow spaces
  • Integrated control system with remote monitoring and fault diagnostics
  • Proven reliability in harsh offshore environments
Weaknesses
  • Complex hydraulic/electrical drive increases initial cost and maintenance requirements
  • Retract/extend mechanism adds moving parts that need regular inspection
  • Installation requires significant structural reinforcement of the bow
  • Weight and size may limit suitability for smaller vessels or those with shallow draft
  • Spare‑part logistics can be more demanding than fixed thrusters
Typical Vessels: Ultra Large Container Vessels (ULCV)Cruise shipsLNG carriersOffshore supply vesselsLarge bulk carriers
Decision Guide: Choose if: you need maximum bow‑thruster thrust on a deep‑draft vessel and want the drag‑reduction benefit of a retractable unit. Avoid if: the vessel is small, has limited bow space, or budget/maintenance resources cannot support the higher complexity.
Use Cases: The AR-4000 is commonly installed on mega‑container ships and cruise liners to aid docking in confined ports, as well as on offshore supply vessels that require precise station‑keeping during cargo transfer operations. Its retractable feature is valuable for vessels that spend long periods at sea where hull resistance must be minimized.
Datasheet
Brunvoll AR-4000 stern unverified
· 4000.0 kW · Retractable azimuth thruster
Power (kW)
4000
Thrust (kN)
520.0
Diameter (mm)
3200
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈130 kN/MW) suitable for large vessels
  • Retractable design eliminates hydrodynamic resistance during cruising, improving fuel efficiency
  • Compact footprint allows installation on ships with limited hull space
  • Integrated electronic control system enables precise low‑speed maneuvering and DP support
  • Proven reliability in harsh offshore environments
Weaknesses
  • Complex hydraulic/electrical retract mechanism increases maintenance requirements
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power
  • Installation is limited to stern positions due to size and shaft alignment
  • Longer lead‑time for manufacturing and delivery
  • Potential for increased vibration if not properly aligned
Typical Vessels: Very Large Crude Carrier (VLCC)LNG carrierCruise shipOffshore supply vesselLarge container ship
Certifications: DNVABS
Decision Guide: Choose if the vessel requires high thrust for low‑speed maneuvering, benefits from drag reduction when cruising, and operates in confined ports or needs dynamic positioning. Avoid if budget constraints favour simpler fixed thrusters, the ship does not need extreme maneuverability, or space/weight penalties of the retractable system are unacceptable.
Use Cases: The AR-4000 is typically deployed on ultra‑large tankers and offshore vessels for port entry/exit, tight‑water docking, dynamic positioning during offshore operations, and as an emergency backup propulsion unit where minimizing hull resistance at cruise speed is critical.
Datasheet
Brunvoll AZ-100 bow unverified
· 100.0 kW · retractable azimuth thruster
Power (kW)
100
Thrust (kN)
13.0
Diameter (mm)
470
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈13 kN at 100 kW) for its size
  • Retractable design reduces hull resistance and protects the unit during transit
  • Compact footprint suitable for vessels with limited bow space
  • Integrated hydraulic drive and control system simplifies installation and operation
  • Proven reliability on DP‑1 offshore support vessels
Weaknesses
  • Limited maximum power (100 kW) may be insufficient for larger DP or high‑speed maneuvering requirements
  • Hydraulic drive adds complexity and requires additional maintenance compared to electric drives
  • Higher upfront cost than a fixed bow thruster of similar power
  • Single unit provides less redundancy; failure impacts manoeuvring capability
  • Noise and vibration levels higher than some low‑speed screw designs
Typical Vessels: Platform Supply Vessel (PSV)Offshore Support VesselSmall Dynamic Positioning vessel (DP‑1)Research / Survey shipFerry or passenger craft with limited bow space
Certifications: DNV
Decision Guide: Choose if you need a compact, high‑thrust bow thruster that can be retracted to minimise drag and protect the unit on vessels with restricted bow volume or shallow draft. Ideal for DP‑1 offshore support ships where space is at a premium. Avoid if your vessel requires higher thrust levels (>15 kN), multiple redundant units, or you prefer an all‑electric drive system to reduce hydraulic maintenance.
Use Cases: Commonly installed on offshore supply vessels for port manoeuvring and low‑speed dynamic positioning assistance; also used on research ships to provide precise station‑keeping in confined waters. The retractable feature is valuable for vessels that spend long periods underway, as it reduces added resistance when the thruster is not needed.
Datasheet
Brunvoll AZ-100 stern unverified
· 100.0 kW · retractable azimuth thruster
Power (kW)
100
Thrust (kN)
13.0
Diameter (mm)
470
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈13 kN at only 100 kW)
  • Retractable design reduces drag and protects the propeller during transit
  • Compact footprint suitable for vessels with limited hull space
  • Low acoustic signature, beneficial for noise‑sensitive operations
  • Integrated control electronics compatible with DP and joystick systems
Weaknesses
  • Limited to medium power range; not suited for very large ships requiring >200 kW per thruster
  • Retract/extend mechanism adds complexity and requires regular inspection
  • Higher upfront cost compared with fixed tunnel thrusters of similar rating
  • Potential for water ingress at the retraction seals if maintenance is neglected
  • Installation requires hull modifications to accommodate the retraction tube
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS)Crew Transfer Vessel (CTV)Workboat / Utility vesselResearch or survey vessel
Certifications: DNVABSIMO Type Approval
Decision Guide: Choose if you need a high‑performance manoeuvring aid on a medium‑size vessel, require the ability to retract the thruster for reduced resistance or hull protection, and operate in DP‑supported offshore environments. Avoid if the ship demands very high thrust levels (>15 kN) per unit, has strict budget constraints, or prefers a simpler fixed tunnel thruster with fewer moving parts.
Use Cases: The AZ‑100 is typically deployed on offshore supply and anchor handling vessels that perform frequent dynamic positioning maneuvers near platforms, as well as crew transfer boats that need precise docking while still benefiting from reduced drag during transit. It is also used on research ships where low noise and the option to stow the thruster are advantageous.
Datasheet
Brunvoll AZ-150 bow unverified
· 150.0 kW · retractable azimuth thruster
Power (kW)
150
Thrust (kN)
19.5
Diameter (mm)
505
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (19.5 kN at 150 kW) improves low‑speed manoeuvrability
  • Retractable design eliminates drag and protects the propeller when not in use
  • Compact 505 mm diameter fits vessels with limited bow space
  • Modular construction allows deck‑level maintenance and quick replacement
  • Integrated Brunvoll control system provides precise vectoring and feedback
Weaknesses
  • Retractable mechanism adds mechanical complexity and a potential failure point
  • Initial purchase and installation cost higher than fixed thrusters of similar power
  • Power rating may be insufficient for very large vessels or high‑speed DP operations
  • Requires dedicated hydraulic/electrical supply and space for retraction housing
  • Noise and vibration levels are moderate; additional mitigation may be needed on passenger ships
Typical Vessels: Offshore Supply Vessel (OSV)Platform Supply Vessel (PSV)Multi‑purpose support vesselCruise ferryMedium‑size container feeder
Certifications: DNV
Decision Guide: Choose the AZ-150 when you need strong bow thrust on a medium‑sized vessel, want to minimise cruising resistance, and have space for a retractable housing. Avoid it if the vessel requires very high DP power, has severe budget constraints, or cannot accommodate the retraction mechanism.
Use Cases: Commonly installed on offshore support ships that need precise station‑keeping during cargo transfers, as well as on cruise ferries and feeder vessels that operate in tight ports where rapid lateral thrust is essential for docking and undocking.
Datasheet
Brunvoll AZ-150 stern unverified
· 150.0 kW · retractable azimuth thruster
Power (kW)
150
Thrust (kN)
19.5
Diameter (mm)
505
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈19.5 kN at 150 kW)
  • Retractable design reduces draft and protects the propeller in shallow or debris‑laden waters
  • Compact diameter (505 mm) fits vessels with limited hull space
  • Direct‑drive configuration provides high efficiency and low maintenance
  • Integrated control interface compatible with common bridge consoles
Weaknesses
  • Maximum power of 150 kW may be insufficient for larger tug or heavy‑bollard‑pull applications
  • Retractable mechanism adds mechanical complexity and requires regular inspection/maintenance
  • Single stern location limits maneuvering flexibility compared with dual‑thruster arrangements
  • Potentially lower bollard pull than a fixed‑pitch thruster of the same power rating
  • Spare‑parts logistics can be challenging in remote offshore locations
Typical Vessels: Platform Supply VesselOffshore Support VesselCoastal TugWorkboatResearch / Survey Vessel
Certifications: DNV
Decision Guide: Choose the AZ-150 when you need a compact, high‑efficiency thruster that can be retracted to reduce draft and drag—ideal for shallow‑water offshore support vessels, DP‑enabled workboats, or vessels with limited hull space. Avoid it if your vessel requires higher bollard pull, dual‑thruster redundancy, or operation in heavy ice where a fixed, robust unit is preferred.
Use Cases: Commonly installed on PSVs and offshore supply ships for dynamic positioning during cargo operations, on small harbor tugs for precise maneuvering in confined ports, and on research vessels that operate in shallow coastal waters where the ability to retract the thruster protects it from grounding and reduces fuel consumption when not needed.
Datasheet
Brunvoll AZ-200 bow unverified
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
26.0
Diameter (mm)
540
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (26 kN from 200 kW)
  • Retractable design reduces hull draft and protects the propeller in shallow water
  • Compact installation footprint suitable for vessels with limited bow space
  • Integrated control system compatible with most DP packages
  • Low vibration and noise levels compared to conventional fixed thrusters
Weaknesses
  • Mechanical retractable mechanism adds complexity and maintenance requirements
  • Limited power output may be insufficient for larger ships or high‑power DP applications
  • Higher initial cost than a comparable fixed‑type thruster
  • Spare parts and service expertise can be less readily available in remote ports
  • Potentially lower efficiency at very low speeds compared with ducted fixed units
Typical Vessels: Offshore Supply Vessel (OSV)Platform Supply Vessel (PSV)Anchor Handling Tug Supply (AHTS) – small sizeResearch / Survey vesselsShallow‑draft ferries and coastal cargo ships
Certifications: DNV GL Class ApprovalABS Classification
Decision Guide: Choose if you need strong bow thrust in a vessel with limited draft or restricted bow space, especially for DP‑assisted offshore work or tight‑port manoeuvring. Avoid if the ship requires higher power (>200 kW), prefers minimal mechanical complexity, or operates where maintenance of retractable systems is difficult.
Use Cases: The AZ-200 is typically installed on shallow‑draft offshore supply vessels to provide dynamic positioning and precise docking capability while allowing the thruster to be retracted in rough seas or when sailing. It is also used on research ships that need high manoeuvrability without increasing hull depth, and on coastal ferries operating in confined harbours.
Datasheet
Brunvoll AZ-200 stern unverified
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
26.0
Diameter (mm)
540
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈26 kN @ 200 kW) for excellent maneuverability
  • Retractable design reduces drag and protects the unit when not in use
  • Compact size fits into limited hull spaces, ideal for medium‑size vessels
  • Low vibration and noise due to optimized propeller geometry
  • Designed for integration with dynamic positioning (DP) systems
Weaknesses
  • Mechanical retraction mechanism adds complexity and maintenance requirements
  • Limited maximum power (200 kW) – not suitable for large, high‑thrust vessels
  • Higher upfront cost compared with fixed tunnel thrusters of similar rating
  • Potential cavitation at very high RPMs if operated outside design envelope
  • Requires dedicated control electronics and hydraulic lines
Typical Vessels: Offshore Supply Vessel (OSV)Platform Support Vessel (PSV)Anchor Handling Tug Supply (AHTS) – smaller unitsFerry or passenger vessel requiring precise dockingDP‑equipped workboats
Certifications: DNV GL Class approval
Decision Guide: Choose if you need high maneuverability, DP capability and reduced hull resistance on a medium‑size vessel where space is limited. Avoid if the vessel requires thrust well above 26 kN, prefers a simpler fixed thruster, or has strict budget constraints for initial installation.
Use Cases: Commonly installed on offshore supply ships for dynamic positioning while offloading cargo, on platform support vessels to hold position beside rigs, and on ferries or tugs that need precise low‑speed handling in confined ports. The retractable feature also makes it attractive for vessels that spend long periods cruising where drag reduction is valuable.
Datasheet
Brunvoll AZ-300 bow unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
39.0
Diameter (mm)
610
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈39 kN at 300 kW)
  • Retractable design reduces drag and improves fuel efficiency during transit
  • Compact footprint suitable for vessels with limited hull space
  • Low acoustic signature, beneficial for offshore and passenger ships
  • Fully classed and supported by Brunvoll’s global service network
Weaknesses
  • Maximum power of 300 kW limits use on very large vessels requiring higher thrust
  • Retractable mechanism adds mechanical complexity and maintenance points
  • Higher upfront cost compared with fixed‑pitch bow thrusters of similar rating
  • Installation requires precise hull integration to accommodate retraction system
Typical Vessels: Platform Supply Vessel (PSV)Offshore Support Vessel (OSV)Dynamic Positioning (DP) vessel up to DP2Cruise ship and ferry for docking assistanceSmall to medium container or bulk carriers
Certifications: DNVGL Type Approval
Decision Guide: Choose if you need strong manoeuvring power on a vessel where hull resistance must be kept low, such as DP‑enabled offshore supply ships or passenger vessels that frequently dock. Avoid if the ship requires thrust well above 40 kN, has a very tight budget for propulsion equipment, or operates in environments where the added complexity of a retractable unit is undesirable.
Use Cases: Commonly installed on offshore supply and anchor‑handling tugs to provide precise station‑keeping during cargo operations, on cruise liners for port manoeuvring, and on DP‑equipped vessels that benefit from reduced drag while underway. The thruster’s retractability also makes it attractive for ferries that need both high maneuverability in ports and efficient cruising performance.
Datasheet
Brunvoll AZ-300 stern unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
39.0
Diameter (mm)
610
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈13 kN per 100 kW) for a compact unit
  • Retractable design reduces drag and improves fuel efficiency during transit
  • Low noise and vibration, suitable for DP operations and crew comfort
  • Modular construction simplifies installation and maintenance
  • Wide azimuth range (360°) provides excellent manoeuvrability
Weaknesses
  • Maximum thrust limited to 39 kN – may be insufficient for very large vessels or high‑speed DP maneuvers
  • Retractable mechanism adds mechanical complexity and a potential failure point
  • Higher upfront cost compared with fixed thrusters of similar power
  • Requires compatible control system integration (e.g., Brunvoll’s own drive controller)
  • Limited to 300 kW – not suitable where higher power ratings are required
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS) vesselDynamic Positioning workboat (DP2/DP3)Wind‑farm installation vesselResearch / Survey vessel
Certifications: IMO Type Approval (D‑2)DNV class
Decision Guide: Choose if you need a compact, high‑efficiency thruster that can be retracted to reduce drag and provide excellent DP manoeuvrability on medium‑size offshore vessels. Avoid if the vessel requires thrust well above 40 kN, operates at higher speeds where a fixed thruster is preferred, or budget constraints preclude the higher purchase price of a retractable system.
Use Cases: The AZ‑300 is typically deployed on DP‑equipped offshore support ships for station‑keeping during platform supply, subsea installation, and wind‑farm cable laying. Its retractability makes it attractive for vessels that spend long transits between jobs, allowing the thruster to be stowed to minimise resistance while still providing full 360° thrust when positioning is required.
Datasheet
Brunvoll AZ-400 bow unverified
· 400.0 kW · Retractable azimuth thruster
Power (kW)
400
Thrust (kN)
52.0
Diameter (mm)
680
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈52 kN at 400 kW) for strong low‑speed manoeuvring
  • Retractable design reduces hull resistance and protects the unit during transit
  • Compact installation footprint suitable for vessels with limited bow space
  • Well suited for dynamic positioning (DP) and precise station‑keeping
Weaknesses
  • More complex mechanical system than fixed thrusters, leading to higher maintenance demands
  • Initial purchase cost is typically higher than comparable non‑retractable units
  • Retract/extend cycle time can limit rapid response in emergency manoeuvres
  • Potential for increased noise and vibration if not properly aligned
Typical Vessels: Offshore supply vesselDynamic positioning vesselCruise shipContainer feederMedium‑size tanker
Decision Guide: Choose the AZ-400 when you need strong bow thrust for DP or tight harbour manoeuvring and want to minimise drag during cruising. Avoid it on vessels where budget is a primary concern, where maintenance resources are limited, or where rapid‑deployment of thrust without retraction time is critical.
Use Cases: The AZ-400 is commonly installed on offshore support ships that require precise station‑keeping while conducting subsea operations, as well as on cruise liners and container feeders that need extra bow thrust for docking in congested ports. Its retractable feature also makes it attractive for vessels that spend long periods underway at speed, where drag reduction improves fuel efficiency.
Datasheet
Brunvoll AZ-400 stern unverified
· 400.0 kW · retractable azimuth thruster
Power (kW)
400
Thrust (kN)
52.0
Diameter (mm)
680
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈52 kN at 400 kW)
  • Retractable design reduces hydrodynamic resistance during transit
  • 360° rotation gives excellent maneuverability and DP capability
  • Compact footprint suitable for vessels with limited hull space
  • Integrated control system compatible with most DP packages
Weaknesses
  • Mechanical retraction mechanism adds complexity and maintenance requirements
  • Higher upfront cost compared with fixed‑pitch thrusters of similar power
  • Limited maximum thrust may be insufficient for very large or heavily loaded vessels
  • Hull penetration for the retractable unit can affect structural integrity if not properly designed
  • Access for inspection is more constrained when the unit is retracted
Typical Vessels: Offshore Support Vessel (OSV)Anchor Handling Tug Supply (AHTS)Platform Supply Vessel (PSV)Multipurpose / Utility vessel
Certifications: DNV GL Type Approval
Decision Guide: Choose the AZ‑400 if you need high maneuverability, DP capability and want to minimise drag during cruising – especially on offshore support or AHTS vessels where hull space is at a premium. Avoid it on very large ships that require higher thrust levels or when simplicity and lowest life‑cycle cost are primary concerns.
Use Cases: The AZ‑400 is commonly installed on DP2/DP3 offshore supply vessels for precise station‑keeping during drilling support, as well as on AHTS units for rapid positioning while handling anchors. Its retractable feature is also valued on vessels that spend long periods transiting at speed and need to reduce fuel consumption by eliminating thruster drag.
Datasheet
Brunvoll AZ-500 bow unverified
· 500.0 kW · retractable azimuth thruster
Power (kW)
500
Thrust (kN)
65.0
Diameter (mm)
750
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈65 kN at 500 kW)
  • Retractable design reduces hull resistance when not in use
  • 360° rotatable nozzle provides excellent maneuverability and DP capability
  • Compact installation footprint suitable for vessels with limited bow space
  • Integrated hydraulic drive system offers smooth, low‑vibration operation
Weaknesses
  • Higher capital cost than fixed tunnel thrusters of similar power
  • More complex retractable mechanism increases maintenance intervals
  • Maximum thrust lower than larger fixed azimuth units; may be insufficient for very large vessels
  • Requires dedicated control integration and space for hydraulic power unit
  • Potential cavitation at high RPM if not properly matched to hull form
Typical Vessels: Cruise shipsOffshore supply vessels (OSV)Anchor handling tug supply (AHTS) unitsFerries and Ro‑Ro vesselsMedium‑size container feeders
Certifications: DNV GL class approvalIMO Type Approval (D‑2)
Decision Guide: Choose if you need a compact, high‑maneuverability bow thruster with the ability to retract and reduce drag during transit, especially for vessels requiring dynamic positioning or frequent docking. Avoid if budget constraints dominate, if you require higher absolute thrust than 65 kN, or if you prefer a simpler fixed‑installation thruster with lower maintenance complexity.
Use Cases: The AZ-500 is typically installed on cruise liners and offshore support ships to aid in tight port entries, berthing maneuvers, and dynamic positioning during offshore operations. Its retractable feature makes it attractive for vessels that spend long periods at sea where drag reduction improves fuel efficiency.
Datasheet
Brunvoll AZ-500 stern unverified
· 500.0 kW · Retractable azimuth thruster
Power (kW)
500
Thrust (kN)
65.0
Diameter (mm)
750
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (65 kN at 500 kW)
  • Retractable design reduces hydrodynamic resistance when not in use
  • Compact installation footprint suitable for vessels with limited stern space
  • Low vibration and noise levels, beneficial for passenger comfort
  • Integrated control system compatible with DP2 requirements
Weaknesses
  • Mechanical retractable mechanism adds complexity and maintenance needs
  • Higher initial capital cost compared with fixed thrusters of similar power
  • Installation requires a dedicated tunnel or recess in the hull
  • Maximum thrust lower than larger fixed azimuth units for the same power rating
  • Dependence on hydraulic power supply and control integration
Typical Vessels: Offshore Supply VesselAnchor Handling Tug Supply (AHTS)DP2 Platform Support VesselCruise ShipFerry
Certifications: DNV GL
Decision Guide: Choose if the vessel needs high maneuverability, dynamic positioning capability, and wants to minimise drag during transit by retracting the thruster. Avoid if the ship operates primarily at constant speed without DP requirements, has ample space for fixed thrusters, or budget constraints preclude the higher upfront cost.
Use Cases: Commonly installed on offshore support ships for station‑keeping during drilling or subsea operations, and on passenger vessels for precise low‑speed docking while allowing retraction to improve fuel efficiency on longer voyages.
Datasheet
Brunvoll AZ-600 bow unverified
· 600.0 kW · retractable azimuth thruster
Power (kW)
600
Thrust (kN)
78.0
Diameter (mm)
820
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (78 kN @ 600 kW) suitable for medium‑size vessels
  • Retractable design reduces drag and improves fuel efficiency during normal sailing
  • 360° rotation provides excellent low‑speed manoeuvring and DP capability
  • Compact installation footprint compared with fixed tunnel thrusters of similar power
  • Brunvoll’s proven control system integrates easily with most ship automation suites
Weaknesses
  • Higher initial cost and maintenance complexity than a conventional fixed tunnel thruster
  • Retractable mechanism adds moving parts that require regular inspection and lubrication
  • Installation may need structural reinforcement of the bow to accommodate retraction cylinders
  • Limited availability of spare parts in remote regions compared with more common manufacturers
Typical Vessels: Container ships (5 000–20 000 dwt)Product tankers and chemical carriersCruise vessels and ferriesOffshore supply & anchor handling tug supply (AHTS) vesselsLNG/LPG carriers with DP requirements
Decision Guide: Choose if you need strong bow thrust for tight port manoeuvring or dynamic positioning while wanting to minimise added resistance during cruise. Avoid if budget constraints dominate, the vessel operates primarily in deep water where a fixed thruster suffices, or maintenance resources for retractable systems are limited.
Use Cases: The AZ‑600 is typically installed on vessels that require frequent low‑speed manoeuvres—such as container ships docking at congested terminals, cruise liners berthing alongside piers, and offshore supply vessels maintaining position near rigs. Its retractable feature allows the ship to retain a clean hull form for long transits, improving fuel economy.
Datasheet
Brunvoll AZ-600 stern unverified
· 600.0 kW · Retractable azimuth thruster
Power (kW)
600
Thrust (kN)
78.0
Diameter (mm)
820
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (78 kN @ 600 kW) for effective maneuvering and DP support
  • Retractable design reduces hull drag and improves fuel efficiency during transit
  • 360° rotation provides excellent low‑speed handling and station‑keeping capability
  • Compact unit size (820 mm propeller diameter) fits in moderate‑size vessel stern spaces
  • Brunvoll’s proven control system integrates with most DP packages
Weaknesses
  • Retractable mechanism adds complexity and requires regular inspection/maintenance
  • Thrust is lower than a fixed tunnel thruster of the same power rating, limiting extreme maneuvering forces
  • Installation demands a dedicated stern recess and structural reinforcement
  • Potential for retraction failure in heavy seas if not properly maintained
  • Higher initial cost compared with conventional fixed azimuth units
Typical Vessels: Offshore supply vessels (OSV)Dynamic positioning tankers (DP2/DP3)Cruise ships and ferries requiring stern maneuverabilityLNG carriers with DP requirementsPlatform support vessels
Certifications: DNV GL class approval
Decision Guide: Choose if: you need a high‑performance stern thruster that can be retracted to save fuel, the vessel operates under dynamic positioning or requires excellent low‑speed handling. Avoid if: budget constraints limit upfront cost, maintenance resources are scarce, or the vessel does not benefit from a retractable unit (e.g., vessels with constant thrust demand).
Use Cases: The AZ-600 is typically installed on offshore support ships and DP‑equipped tankers to provide precise station‑keeping during offshore operations, as well as on cruise liners for tight port manoeuvring. Its retractable feature is exploited on long transits where reduced drag translates into measurable fuel savings.
Datasheet
Brunvoll AZ-750 bow unverified
· 750.0 kW · retractable azimuth thruster
Power (kW)
750
Thrust (kN)
97.5
Diameter (mm)
925
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈13 kN per 100 kW) for strong maneuvering forces
  • Retractable design reduces drag during transit, improving fuel efficiency
  • Compact unit fits in limited bow space and can be integrated with DP control systems
  • Low vibration and noise levels compared with conventional fixed thrusters
  • Proven on a range of offshore support vessels with DNV/ABS class approvals
Weaknesses
  • More complex hydraulic/mechanical retraction system increases maintenance requirements
  • Higher upfront cost than a comparable fixed tunnel thruster
  • Installation demands precise hull cut‑outs and sufficient bow clearance
  • Potential for seal wear or actuator failure if not inspected regularly
  • Weight and size may limit suitability for smaller vessels
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS) vesselDynamic Positioning (DP) platform supply shipLNG carrier with DP requirementsCruise ship or ferry needing enhanced bow manoeuvrability
Certifications: DNV GL class approvalABS class approval
Decision Guide: Choose the AZ‑750 when you need high thrust for DP or tight port handling and want to keep transit resistance low through a retractable unit. It is ideal for vessels with sufficient bow volume and budgets that can accommodate the added complexity. Avoid if the vessel operates primarily at low speeds, has severe space constraints that preclude a retraction mechanism, or if cost‑sensitive projects favour simpler fixed thrusters.
Use Cases: The AZ‑750 is typically installed on offshore support ships that perform dynamic positioning while drilling or loading/offloading cargo, as well as on large tankers and cruise vessels that require strong bow thrust for precise docking in confined ports. Its retractable feature is especially valued on vessels that spend long periods cruising at speed, where drag reduction translates into measurable fuel savings.
Datasheet
Brunvoll AZ-750 stern unverified
· 750.0 kW · retractable azimuth thruster
Power (kW)
750
Thrust (kN)
97.5
Diameter (mm)
925
Type
azimuth
Location
stern
Strengths
  • High thrust-to-power ratio (≈130 kN/MW) for a compact unit
  • Retractable design reduces hull resistance when not in use, improving fuel efficiency
  • 360° rotatable nozzle provides excellent maneuverability and DP capability
  • Proven Brunvoll reliability with modular maintenance access
  • Suitable for vessels requiring both bow and stern thrust without additional hull penetrations
Weaknesses
  • Maximum power limited to 750 kW, may be insufficient for very large DP‑class ships
  • Retractable mechanism adds mechanical complexity and requires regular inspection
  • Noise and vibration levels higher than fixed tunnel thrusters of similar size
  • Installation cost higher than basic fixed propellers due to hydraulic/electrical controls
Typical Vessels: Platform Supply Vessel (PSV)Anchor Handling Tug Supply (AHTS) vesselOffshore Wind Installation vesselDynamic Positioning research or survey vesselsMedium‑size cruise ships with tight port requirements
Decision Guide: Choose if you need a high‑thrust, 360° maneuvering solution on the stern of a medium‑sized offshore vessel and want to minimise drag when the thruster is retracted. Avoid if your vessel requires more than 750 kW thrust, has very strict noise limits, or if budget constraints favour a simpler fixed tunnel thruster.
Use Cases: The AZ-750 is typically deployed on offshore support ships that perform dynamic positioning during cargo transfer, anchor handling, and wind‑farm installation. Its retractable feature allows the vessel to cruise efficiently between operations while still providing powerful thrust for precise station‑keeping when required.
Datasheet
Brunvoll AZ-1000 bow unverified
· 1000.0 kW · Retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
130.0
Diameter (mm)
1100
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈130 kN at 1 000 kW)
  • Retractable design reduces drag and improves fuel efficiency when not in use
  • Compact footprint suitable for DP‑2/DP‑3 vessels
  • Modular construction simplifies installation and maintenance
  • Proven performance on offshore support vessels
Weaknesses
  • Higher capital cost compared with fixed thrusters
  • Complex hydraulic/electrical control system requires specialised training
  • Retract/extend mechanism adds mechanical wear points
  • Requires sufficient bow space for housing the retracted unit
  • Long lead‑time for spare parts in some regions
Typical Vessels: Platform Supply Vessel (PSV)Offshore Support Vessel (OSV)Anchor Handling Tug Supply (AHTS)Dynamic Positioning vesselMultipurpose offshore workboat
Certifications: DNV
Decision Guide: Choose if: you need high manoeuvrability and DP capability on a vessel where hull resistance must be kept low, especially for offshore station‑keeping or tight‑port operations. Avoid if: budget constraints dominate, the vessel lacks adequate bow space, or a simpler fixed thruster meets the operational profile.
Use Cases: The AZ-1000 is typically deployed on offshore supply and support vessels for dynamic positioning during drilling or construction activities, for precise station‑keeping while loading/unloading cargo, and for low‑speed manoeuvring in congested ports where rapid thrust response is critical.
Datasheet
Brunvoll AZ-1000 stern unverified
· 1000.0 kW · retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
130.0
Diameter (mm)
1100
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈130 kN @ 1 MW) enables strong DP capability
  • Retractable design reduces hull resistance when not in use, improving fuel efficiency
  • Compact unit fits into limited stern space on offshore supply and AHTS vessels
  • Integrated control system compatible with most vessel DP packages
  • Quick deployment/retraction for rapid response to maneuvering demands
Weaknesses
  • Higher upfront cost compared with fixed tunnel thrusters
  • Complex hydraulic/mechanical retraction mechanism adds maintenance requirements
  • Potential reliability risk if the retract/extend system fails while underway
  • Power consumption is significant; may impact overall vessel fuel budget
  • Installation requires precise hull integration and reinforcement
Typical Vessels: Offshore Supply Vessel (OSV)Platform Supply Vessel (PSV)Anchor Handling Tug Supply (AHTS)DP‑enabled workboatsCruise ships with high maneuverability needs
Certifications: DNV Type Approval
Decision Guide: Choose if: the vessel requires strong dynamic positioning, tight port manoeuvring, or wants to minimise drag when thruster is not in use. Avoid if: budget constraints are critical, the ship lacks space for a retractable unit, or the operational profile does not demand high thrust or DP capability.
Use Cases: The AZ‑1000 is typically deployed on offshore support vessels for station‑keeping during platform operations, rapid repositioning in congested harbours, ice‑class ships needing extra thrust for navigation, and cruise liners that benefit from reduced drag when the thruster is retracted.
Datasheet
Brunvoll AZ-1200 bow unverified
· 1200.0 kW · retractable azimuth bow thruster
Power (kW)
1200
Thrust (kN)
156.0
Diameter (mm)
1240
Type
azimuth
Location
bow
Strengths
  • High thrust-to-power ratio (≈156 kN at 1 200 kW) for rapid lateral manoeuvring
  • Retractable design reduces hull resistance and fuel consumption during cruise
  • Compact 1240 mm diameter fits in relatively narrow bow tunnels compared with fixed thrusters of similar power
  • Integrated control system compatible with most DP packages
  • Proven reliability on a range of large commercial vessels
Weaknesses
  • Large installation envelope; requires substantial bow space and structural reinforcement
  • Higher initial cost than conventional fixed‑pitch bow thrusters of comparable power
  • Complex hydraulic/electrical interfaces increase maintenance demands
  • Weight and size may limit suitability for smaller vessels or retrofits with limited clearance
  • Spare parts inventory can be more specialized, affecting lead times
Typical Vessels: Offshore supply & support vesselsCruise shipsContainer ships (≥8 000 gt)Tankers and bulk carriers (mid‑size to large)Ferries with high maneuverability requirements
Certifications: DNV
Decision Guide: Choose if you need a high‑thrust bow thruster on a vessel where drag reduction is important, such as offshore DP vessels or large passenger ships, and the hull can accommodate a 1.24 m diameter retractable unit. Avoid if the ship is small, budget‑constrained, or lacks sufficient bow space for the retraction mechanism.
Use Cases: The AZ-1200 is typically installed on vessels that require precise low‑speed positioning—e.g., offshore support ships performing dynamic positioning, cruise liners docking in tight ports, and tankers entering confined terminals where rapid lateral thrust improves safety and turnaround time.
Datasheet
Brunvoll AZ-1200 stern unverified
· 1200.0 kW · retractable azimuth thruster
Power (kW)
1200
Thrust (kN)
156.0
Diameter (mm)
1240
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈156 kN at 1 200 kW) suitable for dynamic positioning and rapid maneuvering
  • Retractable design reduces hull resistance during transit and protects the propeller in debris‑rich waters
  • Robust, marine‑grade steel construction with proven service life on offshore vessels
  • External access for routine inspection and maintenance without dry‑docking
  • Integrated control system compatible with most DP packages
Weaknesses
  • Higher initial purchase and installation cost compared with fixed tunnel thrusters
  • Complex hydraulic/pneumatic retraction mechanism adds potential failure points
  • Requires sufficient hull volume at the stern for full retraction, limiting retrofit options
  • Slightly lower propulsive efficiency when fully extended versus a dedicated fixed‑pitch propeller
  • Spare parts inventory is more specialized than for standard tunnel thrusters
Typical Vessels: Offshore supply vessel (OSV)Platform support vesselDP2/DP3 offshore construction vesselAnchor handling tug supply (AHTS) with DP capabilityCruise ship or ferry requiring high maneuverability in ports
Certifications: DNV
Decision Guide: Choose the AZ‑1200 if you need a powerful stern thruster for dynamic positioning, want drag reduction during cruising, and have sufficient hull space for retraction. Avoid it on vessels with tight aft compartments, very limited budgets, or where a simpler fixed tunnel thruster meets performance needs.
Use Cases: The AZ‑1200 is typically installed on offshore support ships that perform DP operations near rigs, requiring rapid lateral thrust for station keeping and safe berthing. Its retractable feature is valuable for vessels that spend long periods transiting at speed, as the thruster can be withdrawn to improve fuel efficiency while still being available for precise maneuvering when needed.
Datasheet
Brunvoll AZ-1500 bow unverified
· 1500.0 kW · retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
195.0
Diameter (mm)
1450
Type
azimuth
Location
bow
Strengths
  • High thrust-to-power ratio (≈195 kN at 1.5 MW) for strong maneuvering forces
  • Retractable design reduces drag and fuel consumption when not in use
  • Compact footprint fits into limited bow space on modern vessels
  • Integrated control system compatible with DP‑2/DP‑3 setups
  • Low vibration and noise levels due to optimized propeller geometry
Weaknesses
  • Higher initial purchase price compared with fixed tunnel thrusters
  • More complex mechanical sealing and retraction mechanisms increase maintenance demands
  • Requires sufficient hull volume and structural reinforcement for the retractable housing
  • Installation downtime can be longer because of precise alignment requirements
  • Spare parts inventory is larger due to specialized components
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS)Dynamic Positioning vesselCruise shipLNG carrierWind turbine installation vessel
Decision Guide: Choose if you need high maneuverability, DP capability and want to reduce hull resistance during transit. Avoid if budget constraints or hull design cannot accommodate a retractable unit, or if simplicity/low maintenance is the primary concern.
Use Cases: The AZ-1500 is commonly installed on offshore support vessels for dynamic positioning during drilling or construction operations, on cruise ships for precise docking in tight ports, and on LNG carriers to aid in low‑speed maneuvering and emergency stopping while minimizing drag when cruising.
Datasheet
Brunvoll AZ-1500 stern unverified
· 1500.0 kW · Retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
195.0
Diameter (mm)
1450
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈195 kN @ 1500 kW) suitable for DP2/DP3 vessels
  • Retractable design reduces hull resistance when the thruster is not in use
  • Compact diameter (1.45 m) fits into limited stern space
  • Robust marine‑grade construction rated for harsh offshore environments
  • Integrated control electronics compatible with most ship bridge systems
Weaknesses
  • Complex retractable mechanism increases maintenance workload and costs
  • Higher initial capital cost compared with fixed shaft thrusters of similar power
  • Requires precise hull integration; retrofits can be extensive
  • Spare‑part availability may be limited in regions without a Brunvoll service network
  • Power consumption is significant, impacting overall fuel efficiency
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS)Platform Supply Vessel (PSV)DrillshipLNG Carrier with DP requirements
Decision Guide: Choose if the vessel needs high thrust for dynamic positioning, operates in offshore environments where drag reduction is valuable, and has sufficient budget for a retractable system. Avoid if a simpler fixed thruster meets maneuvering needs, cost sensitivity is paramount, or hull modifications are impractical.
Use Cases: The AZ-1500 is typically installed on DP‑equipped offshore vessels to provide precise station‑keeping during drilling, ROV operations, and cargo transfer, as well as for tight port maneuvers and emergency stopping where rapid thrust reversal is required.
Datasheet
Brunvoll AZ-2000 bow unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
260.0
Diameter (mm)
1800
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (260 kN @ 2000 kW) suitable for DP2/DP3 operations
  • Retractable design reduces hydrodynamic drag when not in use, improving fuel efficiency on transit
  • Compact footprint fits into limited hull space while still offering 360° thrust vectoring
  • Integrated control and monitoring system compatible with most vessel automation platforms
  • Proven reliability on a wide range of offshore support vessels
Weaknesses
  • More complex hydraulic/electrical arrangement than fixed thrusters, leading to higher maintenance demands
  • Higher upfront capital cost compared with conventional fixed azimuth units
  • Retractable mechanism adds weight and requires dedicated hull space for the retraction tube
  • Performance can drop at very low speeds if the retraction system is not fully optimized
Typical Vessels: Offshore Supply Vessel (OSV)Dynamic Positioning Support VesselDrillshipFPSOWind Turbine Installation ShipResearch / Survey Vessel
Certifications: DNVGL Class ApprovalABS ClassificationIMO MSC.1/Circ.1403 Type Approval for DP thrusters
Decision Guide: Choose the AZ‑2000 when you need high thrust for dynamic positioning, want to minimise drag during cruising, and have sufficient hull volume for a retractable unit. Avoid it on vessels with very tight budgets, limited maintenance capacity, or where a fixed thruster would provide adequate performance without the added complexity.
Use Cases: The AZ‑2000 is typically installed on offshore support ships that perform station‑keeping during subsea construction, ROV operations, and wind turbine installation. Its retractable feature also makes it attractive for vessels that spend long periods transiting between job sites and need to reduce resistance while maintaining excellent low‑speed maneuverability in congested ports or tight anchorages.
Datasheet
Brunvoll AZ-2000 stern unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
260.0
Diameter (mm)
1800
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (260 kN at 2 000 kW) suitable for DP operations
  • Retractable design reduces hull resistance when the unit is not in use
  • Compact 1.8 m propeller diameter fits vessels with limited stern space
  • Full 360° steering eliminates need for separate rudders or bow thrusters
  • Proven Brunvoll engineering offers reliable performance in harsh offshore environments
Weaknesses
  • Complex hydraulic/mechanical drive system increases maintenance requirements
  • Higher capital cost compared with fixed‑pitch conventional thrusters
  • Retractable mechanism adds weight and occupies valuable hull volume
  • Seal and bearing wear can be a concern for high‑hour vessels
  • Requires dedicated control integration for DP systems
Typical Vessels: Cruise shipsLNG carriersOffshore supply vessels (OSV)FPSOsLarge passenger ferries
Decision Guide: Choose if the vessel needs high thrust for dynamic positioning, frequent low‑speed manoeuvring, and benefits from reduced drag when the thruster is retracted. Avoid if budget constraints limit capital expenditure, the ship operates primarily at cruise speed where a fixed thruster suffices, or hull space cannot accommodate the retractable unit.
Use Cases: The AZ-2000 is typically installed on the stern of large passenger and offshore vessels to provide precise low‑speed control during docking, undocking, and DP station‑keeping. Its retractability is valuable for cruise ships that spend most of their time at service speed, allowing the thruster to be hidden to minimise fuel consumption.
Datasheet
Brunvoll AZ-2500 bow unverified
· 2500.0 kW · Retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
325.0
Diameter (mm)
2150
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈130 kN per MW) for excellent low‑speed manoeuvrability
  • Retractable design reduces hydrodynamic resistance and fuel consumption when not in use
  • Compact footprint fits into limited bow space, suitable for vessels with narrow hull forms
  • Designed for DP operations with fast response and precise thrust vectoring
  • Modular construction simplifies installation and maintenance
Weaknesses
  • Higher initial capital cost compared with fixed thrusters of similar power
  • Complex hydraulic/electrical drive system increases installation effort and requires specialised spares
  • Retractable mechanism adds moving parts that are subject to wear and require regular inspection
  • Maximum thrust is limited by the retraction depth; full performance may be reduced in very shallow water
Typical Vessels: Offshore Supply Vessel (OSV)Platform Support / Anchor Handling Tug Supply (AHTS)Dynamic Positioning (DP2/DP3) vesselsCruise ships and large ferriesWind‑farm installation support vessels
Certifications: DNVABSIMO Type Approval
Decision Guide: Choose if the vessel needs high manoeuvring power, DP capability, or wants to minimise drag during transit by retracting the thruster. Avoid if budget constraints dominate, the vessel operates only at higher speeds where a fixed thruster would suffice, or hull geometry does not allow for a retractable unit.
Use Cases: The AZ‑2500 is typically deployed for precise docking and undocking in confined ports, dynamic positioning during offshore operations (e.g., drilling, wind turbine installation), low‑speed manoeuvring in tight waterways, and as part of a bow‑stern thruster pair to provide 360° thrust control on DP vessels.
Datasheet
Brunvoll AZ-2500 stern unverified
· 2500.0 kW · Retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
325.0
Diameter (mm)
2150
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈130 kN/MW) for strong maneuvering and DP capability
  • Retractable design reduces hydrodynamic resistance during cruising, improving fuel efficiency
  • Compact footprint suitable for vessels with limited hull space
  • Modular construction allows relatively quick installation and maintenance
  • Proven reliability on offshore DP vessels
Weaknesses
  • Higher capital cost compared with fixed propellers or conventional tunnel thrusters
  • Complex hydraulic/electrical control system requires skilled operators and maintenance crew
  • Requires sufficient hull volume for retraction mechanism, limiting retrofit options
  • Potential fouling of the retractable housing if not regularly cleaned
  • Installation may involve structural reinforcement of the stern
Typical Vessels: Offshore supply vesselFPSOAHTSDP2/DP3 tankerLNG carrier
Certifications: DNV GL class approval
Decision Guide: Choose if the vessel needs high maneuverability, dynamic positioning and wants to minimise cruising resistance with a retractable unit. Avoid if budget is tight, the ship lacks adequate stern space for retraction, or DP capability is not required.
Use Cases: Used for station‑keeping of offshore platforms, dynamic positioning during loading/unloading of LNG or oil, low‑speed maneuvering in confined ports, and as an emergency thrust source on DP vessels.
Datasheet
Brunvoll AZ-3000 bow unverified
· 3000.0 kW · retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
390.0
Diameter (mm)
2500
Type
azimuth
Location
bow
Strengths
  • Very high thrust‑to‑power ratio (≈130 kN/MW) for rapid lateral manoeuvres
  • Retractable design reduces hull resistance when the thruster is not in use, improving fuel efficiency
  • Integrated control and monitoring system compatible with DP2/DP3 packages
  • Proven reliability on offshore supply vessels and DP‑class tankers
  • Compact tunnel footprint compared with fixed‑pitch bow thrusters of similar power
Weaknesses
  • Complex hydraulic/electrical drive requires specialised maintenance and spare parts inventory
  • Higher capital cost than conventional fixed‑pitch bow thrusters of comparable power
  • Requires a dedicated shaft tunnel and retraction space, limiting installation on smaller hulls
  • Weight (≈30 t) can affect vessel stability if not properly accounted for in design
  • Long lead time for manufacturing and delivery due to custom engineering
Typical Vessels: Offshore supply vesselsDP‑class tankersLNG carriersCruise shipsDrillships
Certifications: DNV GL Type Approval
Decision Guide: Choose if: you need high lateral thrust for DP operations, a retractable unit to minimise drag on a vessel with sufficient bow tunnel space, and you can accommodate the higher upfront cost and maintenance complexity. Avoid if: the ship has limited hull volume for retraction, budget constraints favour a simpler fixed‑pitch thruster, or the operational profile does not demand high thrust levels.
Use Cases: The AZ‑3000 is typically installed on large offshore support vessels that require precise station‑keeping in harsh sea states, such as DP2 supply ships operating near rigs, LNG carriers needing tight berthing manoeuvres, and cruise liners navigating congested ports while maintaining passenger comfort. Its retractable feature also makes it attractive for vessels that spend long periods cruising at speed, where drag reduction is valuable.
Datasheet
Brunvoll AZ-3000 stern unverified
· 3000.0 kW · retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
390.0
Diameter (mm)
2500
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈390 kN @ 3 MW) suitable for DP2/DP3 operations
  • Retractable design reduces hull resistance and protects the unit when not in use
  • Compact footprint allows installation on vessels with limited stern space
  • Integrated control system provides precise heading and thrust vectoring
  • Low vibration and noise levels compared with conventional fixed‑pitch thrusters
Weaknesses
  • Complex hydraulic/electrical drive and retraction mechanism increase maintenance demands
  • Higher capital cost than a standard fixed bow or stern thruster of similar power
  • Requires dedicated high‑power electrical supply and space for the retraction housing
  • Moving parts (retractable shaft, seals) can be prone to wear in harsh offshore environments
  • Installation may require structural reinforcement of the hull
Typical Vessels: Offshore Supply Vessel (OSV)Platform Support Vessel (PSV)DP2/DP3 Cruise ShipResearch / Survey VesselAnchor Handling Tug Supply (AHTS) with DP requirements
Decision Guide: Choose if: you need high thrust for dynamic positioning, want a retractable unit to minimise drag when cruising, and have sufficient hull space and power supply for a 3 MW thruster. Avoid if: budget is tight, vessel only requires modest maneuvering assistance, or the operational profile does not justify the added complexity of a retractable system.
Use Cases: The AZ‑3000 is typically deployed on offshore support ships that must hold position beside rigs in high seas, on DP‑equipped cruise liners for precise port entry and exit, and on research vessels conducting station‑keeping during scientific operations. Its retractability also makes it attractive for vessels that spend long periods cruising where drag reduction is valuable.
Datasheet
Brunvoll AZ-3500 bow unverified
· 3500.0 kW · retractable azimuth thruster
Power (kW)
3500
Thrust (kN)
455.0
Diameter (mm)
2850
Type
azimuth
Location
bow
Strengths
  • Very high thrust (455 kN) suitable for large vessels and DP operations
  • Retractable design minimizes hydrodynamic resistance during cruising
  • Full 360° rotation gives excellent maneuverability in tight ports
  • Robust construction rated for harsh offshore environments
  • Integrated control system compatible with most ship automation platforms
Weaknesses
  • High power demand (3 500 kW) leads to increased fuel consumption
  • Complex installation requiring a dedicated shaft tunnel and hydraulic retract mechanism
  • Higher initial cost compared with fixed bow thrusters of similar size
  • Maintenance access can be more involved due to the retractable unit
  • Spare‑part logistics may be longer for this specific high‑power model
Typical Vessels: Cruise shipsLNG carriersOffshore supply vessels (OSV)FPSOsLarge container ships with DP2/DP3 capability
Decision Guide: Choose if: you need maximum bow thrust for dynamic positioning, ice‑class or high‑speed vessels where reduced drag when cruising is critical, and you have the space for a retractable shaft tunnel. Avoid if: vessel power budget is limited, upfront cost must be minimal, or hull design cannot accommodate the required tunnel dimensions.
Use Cases: The AZ-3500 is typically installed on large passenger liners, LNG carriers, and offshore support vessels that require precise station‑keeping in ports or at sea while still benefiting from low resistance during transit. It is also favored for DP2/DP3 equipped ships operating in congested waterways or harsh weather conditions.
Datasheet
Brunvoll AZ-3500 stern unverified
· 3500.0 kW · retractable azimuth thruster
Power (kW)
3500
Thrust (kN)
455.0
Diameter (mm)
2850
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈455 kN @ 3.5 MW) for strong maneuvering and DP capability
  • Retractable design lowers hydrodynamic resistance, improving fuel efficiency during transit
  • 360° steerability eliminates the need for separate rudders or bow thrusters
  • Compact installation suitable for vessels with limited hull space
  • Proven reliability on offshore supply and platform support vessels
Weaknesses
  • More complex hydraulic/mechanical system increases maintenance requirements
  • Higher upfront cost compared with conventional fixed propellers or non‑retractable thrusters
  • Retractable mechanism adds weight and occupies internal volume that could be used for other equipment
  • Efficiency drops at very high ship speeds where a fixed screw is more optimal
  • Installation requires structural reinforcement of the hull
Typical Vessels: Platform Supply Vessel (PSV)Offshore Support Vessel (OSV)Anchor Handling Tug Supply (AHTS) – stern applicationCruise ship (stern DP thruster)Multipurpose offshore vessel
Certifications: DNV GL class approvalABS classification
Decision Guide: Choose if the vessel needs strong low‑speed maneuverability, dynamic positioning or frequent docking and can benefit from reduced drag when the thruster is retracted. Avoid if the ship operates primarily at high cruising speeds, has severe budget constraints, or lacks sufficient hull space for the retractable unit.
Use Cases: Typically installed on offshore supply vessels to provide precise station‑keeping during cargo transfer, on cruise ships for stern docking assistance, and on AHTS units where a powerful, steerable thrust source is required without compromising transit efficiency.
Datasheet
Brunvoll AZ-4000 bow unverified
· 4000.0 kW · retractable azimuth thruster
Power (kW)
4000
Thrust (kN)
520.0
Diameter (mm)
3200
Type
azimuth
Location
bow
Strengths
  • Very high thrust (520 kN) suitable for large vessels and DP operations
  • Retractable design reduces drag and fuel consumption when not in use
  • Compact vertical installation saves deck space compared with fixed tunnel units
  • Proven Brunvoll hydraulic drive offers smooth, precise steering response
  • Class‑approved control integration simplifies ship‑board automation
Weaknesses
  • Higher initial purchase and installation cost than conventional fixed thrusters
  • Complex retraction mechanism requires regular maintenance and periodic inspections
  • Requires significant hull penetration and internal space for the retractable housing
  • Hydraulic system adds weight and may need dedicated oil management on board
  • Long lead‑time for spare parts due to specialized design
Typical Vessels: Cruise shipLNG carrierLarge container vesselOffshore supply/support vesselVery large bulk carrier
Certifications: DNVIMO Type Approval
Decision Guide: Choose if the vessel needs high bow‑thruster thrust for tight port manoeuvring, dynamic positioning or emergency stop and you want drag reduction when the thruster is not in use. Avoid if budget constraints are dominant, the ship size does not justify a 4 MW unit, or hull space cannot accommodate the retractable housing.
Use Cases: The AZ‑4000 is typically installed on mega‑cruise liners and LNG carriers to assist with docking/undocking in confined harbours, to provide DP backup thrust for station‑keeping during offshore operations, and to enable rapid manoeuvre in narrow channels while keeping hull resistance low when retracted.
Datasheet
Brunvoll AZ-4000 stern unverified
· 4000.0 kW · retractable azimuth thruster
Power (kW)
4000
Thrust (kN)
520.0
Diameter (mm)
3200
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (520 kN at 4 MW) suitable for large DP vessels
  • Retractable design reduces drag when the thruster is not in use, improving fuel efficiency
  • Full 360° rotation provides excellent maneuverability and station‑keeping capability
  • Robust construction with proven Brunvoll hydraulic drive system for reliable operation
  • Integrated control interface compatible with most ship automation systems
Weaknesses
  • Complex hydraulic and power transmission system increases maintenance requirements
  • Large hull penetration and structural reinforcement add to installation cost and weight
  • Higher upfront capital cost compared with fixed‑pitch bow thrusters of similar power
  • Retractable mechanism adds moving parts that may be prone to wear in harsh marine environments
  • Limited availability of spare parts in remote regions can extend downtime
Typical Vessels: Offshore Supply Vessels (OSV)Anchor Handling Tug Supply (AHTS) vesselsDrillships and FPSOs with DP‑2/DP‑3 requirementsLarge cruise ships requiring stern maneuvering assistanceHeavy lift & transport vessels
Certifications: DNV
Decision Guide: Choose if: you need high thrust for DP or tight‑port maneuvers and want drag reduction when the thruster is idle. Avoid if: budget constraints limit capital spend, vessel size does not justify a 4 MW stern unit, or maintenance resources are limited.
Use Cases: The AZ-4000 is typically deployed on vessels that perform offshore positioning work—such as platform supply ships and drillships—where precise station‑keeping under wind, wave, and current loads is critical. It also serves large cruise or heavy‑lift ships that require rapid stern thrust for docking, undocking, or emergency stop maneuvers.
Datasheet

Schottel

53
Schottel SRP 2020 FP
SRP 2020 FP
2000 kW · 2000.0 kW · Seawater · Retractable azimuth thruster
Common Failures & Inspection Points
  • Lower gear unit oil leak
  • Azimuth drive failure
  • Propeller blade damage
  • Slewing bearing wear
Service: Schottel retractable; check lower unit oil for seawater contamination.
Spare Parts: Schottel: Getriebeöl und Dichtungen an Bord. Lead time: 3-6 Wochen.
Strengths
  • Full 360° thrust vectoring gives excellent maneuverability for docking and DP operations.
  • Retractable design reduces hydrodynamic resistance, improving fuel efficiency at cruise speed.
  • Compact installation suitable for vessels with limited hull space or shallow draft.
  • Fixed‑pitch propeller offers high thrust efficiency over a wide RPM range.
  • Integrated lower gear unit allows direct drive from medium‑speed diesel or electric motor.
Weaknesses
  • Complex retractable mechanism adds to initial capital cost and requires specialised maintenance.
  • Lower gear unit oil system is prone to seawater contamination if seals fail, leading to leaks.
  • Slewing bearing wear can become a significant maintenance item over the service life.
  • Azimuth drive electronics are sensitive to harsh marine environments; failure may disable thrust direction.
  • Propeller blade damage from debris or grounding is more likely when operating in shallow waters.
Typical Vessels: Offshore supply vesselPlatform supply vesselFerry / Ro‑Ro shipMedium‑size container ship (bow thruster)Bulk carrier with DP capability
Certifications: IMO Type Approval for azimuth thrustersDNV GL class notationABS classification
Decision Guide: Choose if the vessel needs high maneuverability, dynamic positioning or frequent docking and also benefits from reduced drag during transit. Avoid if budget constraints limit upfront cost, maintenance facilities are limited, or the operational profile does not require thrust vectoring (e.g., straight‑line voyages only).
Use Cases: The SRP 2020 FP is commonly installed as a bow thruster on offshore supply vessels for precise station‑keeping near rigs, as a stern thruster on ferries to aid rapid turn‑around in ports, and on medium‑size container or bulk carriers where DP capability and drag reduction are required during long voyages.
Datasheet
Schottel SRP Thruster 100kW bow unverified
· 100.0 kW · Retractable azimuth thruster
Power (kW)
100
Thrust (kN)
12.0
Diameter (mm)
580
Type
azimuth
Location
bow
Strengths
  • Compact design with retractable housing reduces hull resistance during transit
  • Full 360° thrust vectoring gives excellent low‑speed maneuverability and station keeping
  • Integrated electric motor (100 kW) matches well with medium‑size vessels' power budgets
  • Proven Schottel reliability and easy maintenance access via the retractable shaft
Weaknesses
  • Maximum thrust of ~12 kN may be insufficient for larger ships or heavy‑load operations
  • Retractable mechanism adds moving parts that require regular inspection and lubrication
  • Higher initial purchase price compared with fixed bow thrusters of similar power
  • Noise and vibration can be noticeable at full power, requiring additional acoustic mitigation
Typical Vessels: Offshore supply vesselWorkboat / Utility vesselSmall ferry or passenger craftResearch / Survey vesselDP‑0/DP‑1 offshore support ship
Certifications: DNV GL Class ApprovalABS Class ApprovalLloyd's Register Type Approval
Decision Guide: Choose if you need a high‑maneuverability bow thruster on a vessel where hull resistance matters and power is limited to ~100 kW. Avoid if the ship requires higher thrust, continuous operation without retraction, or a lower‑cost fixed installation.
Use Cases: The SRP 100 kW is typically installed on offshore supply vessels for precise port entry/exit, on small DP‑0 ships to assist with dynamic positioning during subsea operations, and on workboats that need rapid side thrust while maintaining low drag when cruising. Its retractable feature makes it popular where fuel efficiency and speed are critical.
Datasheet
Schottel SRP Thruster 100kW stern unverified
· 100.0 kW · retractable azimuth thruster
Power (kW)
100
Thrust (kN)
12.0
Diameter (mm)
580
Type
azimuth
Location
stern
Strengths
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency.
  • Compact diameter (580 mm) fits vessels with limited hull space.
  • Full‑circle thrust vectoring gives excellent low‑speed maneuverability and DP0/DP1 capability.
  • Integrated hydraulic drive simplifies installation and control integration.
  • Proven Schottel reliability and worldwide service network.
Weaknesses
  • Maximum thrust (≈12 kN) may be insufficient for large tugs or vessels operating in strong currents.
  • Retractable mechanism adds mechanical complexity and requires regular inspection/maintenance.
  • Higher initial purchase price compared with fixed‑pitch thrusters of similar power.
  • Limited redundancy – a single unit provides all stern thrust; failure impacts maneuverability.
  • Performance can be affected by fouling on the retractable housing if not regularly cleaned.
Typical Vessels: Offshore supply vesselDP0/DP1 platform support shipFerry / Ro‑Ro vesselCruise ship tenderSmall container or bulk carrier (≤30 000 dwt)
Certifications: DNVGL class approval
Decision Guide: Choose if the vessel needs a compact stern thruster with the ability to retract for reduced drag, operates under moderate thrust requirements (<13 kN), and benefits from precise low‑speed maneuvering or basic dynamic positioning. Avoid if high thrust (>15 kN) is required, the operating environment involves heavy seas or ice where a fixed, more robust unit is preferable, or maintenance resources for retractable mechanisms are limited.
Use Cases: Commonly installed on offshore support vessels to provide DP0/DP1 capability and safe berthing in confined ports; used on ferries and cruise tenders to improve docking precision while allowing the thruster to be hidden during cruising; fitted on small cargo ships where hull space is at a premium and drag reduction is valuable.
Datasheet
Schottel SRP Thruster 200kW bow unverified
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
24.0
Diameter (mm)
660
Type
azimuth
Location
bow
Strengths
  • Retractable design saves hull space and eliminates drag penalty during transit
  • Compact 660 mm propeller diameter fits narrow bow tunnels on medium‑size vessels
  • 360° thrust vectoring gives excellent maneuverability and DP1 support
  • Schottel’s proven reliability and low maintenance track record
  • 200 kW/24 kN rating is well matched to vessels up to ~5,000 GT for docking and low‑speed positioning
Weaknesses
  • Maximum thrust of 24 kN may be insufficient for larger ships or strong current conditions
  • Retractable mechanism adds mechanical complexity and a potential maintenance point
  • Power rating limits use on higher‑class DP (DP2/DP3) applications
  • Installation requires a dedicated tunnel, hydraulic system and space for retraction gear
  • Higher upfront cost compared with fixed bow thrusters of similar power
Typical Vessels: Offshore supply vesselSmall tankerContainer feederCruise ship tenderResearch / survey vesselFerry
Certifications: DNVABS
Decision Guide: Choose if you need a bow thruster on a vessel where hull space is at a premium, you require 360° thrust for docking or DP1 maneuvering and the required thrust does not exceed ~24 kN. Avoid if the ship demands higher thrust levels, higher‑class dynamic positioning (DP2/DP3), or you prefer a simpler fixed installation with lower initial cost.
Use Cases: The SRP 200 kW is typically deployed on offshore support ships and medium‑size commercial vessels for port entry/exit, close‑quarter maneuvering, low‑speed dynamic positioning during offshore operations, and as a retractable aid on cruise ship tenders to protect the propeller in ice or debris.
Datasheet
Schottel SRP Thruster 200kW stern unverified
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
24.0
Diameter (mm)
660
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (24 kN at 200 kW) for a compact unit
  • Retractable design reduces hull resistance and protects the propeller during transit
  • Full 360° rotation gives excellent maneuverability and DP capability
  • Modular installation – can be fitted to new builds or retro‑fitted with limited structural changes
  • Proven Schottel reliability and worldwide service network
Weaknesses
  • Limited maximum power (200 kW) may be insufficient for larger vessels or high‑power DP requirements
  • Retractable mechanism adds mechanical complexity and potential maintenance points
  • Higher initial purchase price compared with a fixed tunnel thruster of similar size
  • Hydraulic actuation system requires regular inspection to avoid leaks
  • Thrust is lower than that of larger fixed azimuth units, limiting its use on heavy‑load ships
Typical Vessels: Offshore supply vessels (OSV)Workboats / tugsFerries and Ro‑Ro craftCoastal tankersSmall container or bulk carriers requiring DP assistance
Certifications: IMO D-2
Decision Guide: Choose if you need a compact, high‑maneuverability thruster that can be retracted to minimise drag on medium‑size vessels with moderate power requirements (e.g., OSVs, tugs, ferries). Avoid if the vessel demands higher thrust levels, continuous operation without retraction, or if budget constraints favour a simpler fixed tunnel thruster.
Use Cases: The SRP 200 is commonly installed on offshore support ships for dynamic positioning during drilling or ROV operations, on harbor‑maneuvering vessels to reduce turning circles, and on ferries where the unit can be retracted while cruising to improve fuel efficiency.
Datasheet
Schottel SRP Thruster 300kW bow unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
36.0
Diameter (mm)
740
Type
azimuth
Location
bow
Strengths
  • Retractable design lowers hull resistance and improves fuel efficiency during transit.
  • Full 360° rotation gives excellent low‑speed maneuverability for docking and DP support.
  • Compact 740 mm propeller diameter fits vessels with limited bow space.
  • Schottel’s proven hydraulic drive offers high reliability and easy maintenance.
  • Integrated control system compatible with most bridge navigation suites.
Weaknesses
  • Higher initial purchase and installation cost compared with fixed tunnel thrusters.
  • Requires dedicated hull volume for the retraction mechanism, limiting retro‑fit options.
  • Maximum thrust (≈36 kN) is lower than some fixed‑pit thrusters of equal power rating.
  • Hydraulic actuation adds complexity and potential leak points.
  • Noise and vibration can be higher at full power due to open propeller operation.
Typical Vessels: Offshore supply vesselCruise shipContainer ship (mid‑size)LNG carrier (medium size)Ferry
Certifications: DNVABS
Decision Guide: Choose if you need a high‑maneuverability bow thruster on a vessel where hull resistance matters and there is space for a retractable unit. Avoid if budget constraints are tight, the ship lacks sufficient bow volume for retraction hardware, or maximum thrust requirements exceed what a 300 kW SRP can deliver.
Use Cases: The SRP 300 kW is commonly installed on offshore support vessels and cruise ships to aid precise port entry/exit, as well as on medium‑size container or LNG carriers that benefit from reduced drag during open‑sea sailing while still needing strong bow thrust for docking and dynamic positioning.
Datasheet
Schottel SRP Thruster 300kW stern unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
36.0
Diameter (mm)
740
Type
azimuth
Location
stern
Strengths
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency.
  • 360° rotation gives excellent maneuverability for docking and dynamic positioning on small vessels.
  • Compact footprint (740 mm propeller diameter) fits shallow‑draft hulls and limited space aft.
  • Integrated electric drive offers low vibration and noise compared with hydraulic drives.
  • Standard Schottel modular construction simplifies installation and spare‑part logistics.
Weaknesses
  • Maximum power of 300 kW limits thrust for larger vessels or high‑resistance operations.
  • Retract/extend mechanism adds mechanical complexity and requires regular inspection.
  • Higher upfront cost than a fixed tunnel thruster of comparable power.
  • Maintenance access can be restricted when the unit is retracted inside the hull.
  • Limited propeller size restricts efficiency at very low speeds compared with larger azimuth pods.
Typical Vessels: Offshore Supply VesselWorkboat / Utility vesselCoastal Container ship (small)Ferry (short‑range)Small tanker or product carrier
Certifications: DNV GL Type ApprovalABS Classification
Decision Guide: Choose if you need a compact, retractable thruster for vessels that benefit from reduced drag during cruising and require high maneuverability at low to moderate power levels. Avoid if the vessel demands higher thrust (>40 kN) or operates primarily in heavy‑weather DP where a larger fixed azimuth pod is more appropriate.
Use Cases: Commonly installed on the stern of offshore supply vessels for dynamic positioning during cargo operations, on ferries and workboats for precise docking assistance, and on small tankers to aid maneuvering in confined ports while allowing the thruster to be retracted for fuel‑efficient transit.
Datasheet
Schottel SRP Thruster 400kW bow unverified
· 400.0 kW · retractable azimuth thruster
Power (kW)
400
Thrust (kN)
48.0
Diameter (mm)
820
Type
azimuth
Location
bow
Strengths
  • Retractable design saves hull space and eliminates drag penalty during transit.
  • Full 360° rotation provides excellent maneuverability for low‑speed docking and dynamic positioning.
  • Compact 820 mm propeller diameter fits vessels with limited bow volume.
  • Schottel’s proven control system integrates easily with existing ship automation.
  • Modular installation allows retrofitting on existing hulls.
Weaknesses
  • Mechanical retraction mechanism adds maintenance complexity compared with fixed thrusters.
  • Maximum thrust (≈48 kN) may be insufficient for very large vessels or heavy‑ice operations.
  • Higher upfront cost than a comparable fixed bow thruster.
  • Potential for gear wear if operated frequently in harsh marine environments.
Typical Vessels: Offshore supply vesselCruise ship (mid‑size)FerryContainer feederProduct tanker up to ~30 k DWT
Certifications: DNV
Decision Guide: Choose if you need a bow thruster that can be stowed to minimise resistance and you have limited bow space – ideal for vessels requiring frequent port manoeuvring or DP support. Avoid if the vessel demands higher thrust than 48 kN, operates in heavy ice, or if maintenance resources for retractable gear are constrained.
Use Cases: Commonly installed on offshore support ships for dynamic positioning, cruise liners for precise docking, and medium‑size tankers/ferries where hull form optimisation is critical. The thruster is lowered during low‑speed manoeuvres and retracted while cruising to improve fuel efficiency.
Datasheet
Schottel SRP Thruster 400kW stern unverified
· 400.0 kW · retractable azimuth thruster
Power (kW)
400
Thrust (kN)
48.0
Diameter (mm)
820
Type
azimuth
Location
stern
Strengths
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency.
  • Full 360° rotation provides excellent maneuverability and precise dynamic positioning capability.
  • Compact installation envelope fits vessels with limited hull space or shallow draft constraints.
  • Schottel’s proven bearing and seal technology offers low vibration and high reliability.
  • Modular design simplifies maintenance and allows quick replacement of the propeller unit.
Weaknesses
  • Higher initial cost compared with fixed tunnel thrusters of similar power.
  • Mechanical retraction system adds complexity and requires periodic inspection for wear.
  • Maximum thrust (≈48 kN) may be insufficient for very large vessels or high‑power DP applications.
  • Installation requires precise alignment and integration with the vessel’s control system.
  • Limited to around 400 kW; not suitable where higher power ratings are demanded.
Typical Vessels: Offshore Supply Vessel (OSV)Platform Supply VesselCrew Transfer VesselSmall Container ShipBulk Carrier (up to ~30,000 dwt)FerryWorkboat / Dredger
Certifications: DNV GL Class ApprovedABS ApprovedLloyd's Register Type Approval
Decision Guide: Choose if you need a compact, high‑maneuverability thruster that can be retracted to minimise drag during cruising and you operate vessels up to medium size where 48 kN thrust is adequate. Avoid if budget constraints are tight, the vessel requires higher thrust levels (>50 kN) or you prefer a simpler fixed‑installation system with fewer moving parts.
Use Cases: The SRP 400 kW thruster is typically deployed on offshore support vessels for precise station‑keeping during ROV operations, dynamic positioning while loading/offloading cargo, and tight harbor maneuvers. It is also used on ferries and small bulk carriers where retractability helps maintain cruising efficiency without sacrificing maneuvering power when needed.
Datasheet
Schottel SRP Thruster 500kW bow unverified
· 500.0 kW · retractable ducted azimuth thruster
Power (kW)
500
Thrust (kN)
60.0
Diameter (mm)
900
Type
azimuth
Location
bow
Strengths
  • High propulsive efficiency thanks to the ducted (Kort nozzle) design
  • Retractable capability reduces hull resistance during cruising, saving fuel
  • Full 360° thrust vectoring provides excellent maneuverability and DP performance
  • Compact installation – can be housed in a relatively small bow tunnel
  • Proven reliability with Schottel’s long‑track record in offshore and cruise vessels
Weaknesses
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power
  • Complex hydraulic/mechanical retraction system adds maintenance requirements
  • Requires additional hull space for the retraction well and sealing arrangements
  • Maximum thrust is lower than a similarly powered fixed tunnel thruster due to size constraints
Typical Vessels: Offshore Supply Vessel (OSV)Dynamic Positioning vesselCruise shipLNG carrierResearch / Survey vessel
Certifications: DNVABS
Decision Guide: Choose if the vessel needs a high‑efficiency bow thruster that can be retracted to reduce cruising resistance, requires fine manoeuvring for DP or tight berthing, and has sufficient hull volume for the retraction well. Avoid if budget is tightly constrained, a simpler fixed tunnel thruster meets the maneuvering requirements, or space for the retractable system is unavailable.
Use Cases: Commonly installed on cruise ships for port entry/exit, offshore support vessels that perform dynamic positioning while maintaining fuel efficiency at sea, and LNG carriers where low‑drag operation during long voyages is critical yet precise thrust is needed for berthing.
Datasheet
Schottel SRP Thruster 500kW stern unverified
· 500.0 kW · retractable azimuth thruster
Power (kW)
500
Thrust (kN)
60.0
Diameter (mm)
900
Type
azimuth
Location
stern
Strengths
  • Retractable design reduces hull resistance when the thruster is not in use, improving fuel efficiency.
  • Full 360° thrust vectoring gives excellent manoeuvrability for docking and DP operations.
  • Compact installation footprint suitable for vessels with limited stern space.
  • Integrated Schottel control system allows seamless integration with ship automation and DP controllers.
  • Quick retraction/extension reduces exposure to fouling and impact damage.
Weaknesses
  • Higher initial purchase and installation cost compared with fixed tunnel thrusters of similar power.
  • Mechanical complexity (retractable mechanism, seals) can increase maintenance requirements.
  • Maximum thrust is lower than a comparable fixed tunnel thruster because of the smaller duct diameter.
  • Potential for water ingress at the retractable shaft seal if not maintained rigorously.
Typical Vessels: Offshore Supply VesselAnchor Handling Tug Supply (AHTS)Dynamic Positioning vesselPlatform Supply VesselSmall cruise or ferry with stern maneuvering needs
Decision Guide: Choose if you need a high‑maneuverability stern thruster that can be retracted to minimise drag, especially for DP‑class offshore vessels or ships operating in confined ports. Avoid if budget constraints favour simpler fixed tunnel thrusters, or if the vessel does not require frequent thrust direction changes.
Use Cases: The SRP 500 kW is typically deployed on offshore supply and anchor handling vessels for precise station‑keeping during cargo operations, as well as on DP‑equipped ships for dynamic positioning, emergency thrust when the main propeller fails, and tight‑dock manoeuvring in restricted waterways.
Datasheet
Schottel SRP Thruster 600kW bow unverified
· 600.0 kW · Retractable azimuth thruster
Power (kW)
600
Thrust (kN)
72.0
Diameter (mm)
980
Type
azimuth
Location
bow
Strengths
  • High thrust (≈72 kN) for its power rating, giving excellent low‑speed manoeuvrability
  • Retractable design reduces hydrodynamic resistance when not in use, improving fuel efficiency
  • Full 360° azimuth rotation enables precise positioning and DP capability
  • Modular construction simplifies installation and maintenance
  • Proven reliability on a wide range of offshore and commercial vessels
Weaknesses
  • Higher upfront cost compared with fixed bow thrusters
  • Retract/extend mechanism adds mechanical complexity and requires regular inspection
  • Requires dedicated hull space and structural reinforcement for the retraction tube
  • Performance may drop at very high ship speeds relative to a conventional fixed propeller
Typical Vessels: Offshore supply vesselDynamic positioning vesselContainer feederProduct tankerBulk carrier (mid‑size)Ferry
Certifications: DNV
Decision Guide: Choose if the vessel needs strong low‑speed thrust for DP or tight port manoeuvring and also benefits from reduced drag during cruising. Avoid if budget is limited, hull space cannot accommodate a retraction tube, or the operating profile does not require frequent thruster use.
Use Cases: Commonly installed on offshore support ships that alternate between high‑speed transits and precise station‑keeping, as well as on medium‑size cargo vessels that need powerful bow thrust for port entry while wanting to minimise resistance during open‑water sailing.
Datasheet
Schottel SRP Thruster 600kW stern unverified
· 600.0 kW · retractable azimuth thruster
Power (kW)
600
Thrust (kN)
72.0
Diameter (mm)
980
Type
azimuth
Location
stern
Strengths
  • Retractable design reduces hull resistance when the thruster is not in use, improving fuel efficiency.
  • High thrust‑to‑power ratio (≈72 kN at 600 kW) provides strong maneuvering and DP capability.
  • Compact installation footprint; fits into a small tunnel without a permanent ducted tunnel protruding from the hull.
  • Fast deployment/retraction mechanism enables rapid transition between cruising and maneuvering modes.
  • Integrated control system compatible with most vessel DP packages.
Weaknesses
  • Mechanical retract/extend system adds complexity and requires regular inspection and maintenance.
  • Higher upfront cost compared with fixed tunnel or conventional azimuth thrusters.
  • Requires dedicated hull space for the retraction cavity, limiting applicability on vessels with constrained internal volume.
  • Potential for reduced thrust when operating at partial extension if not fully deployed.
Typical Vessels: Platform Supply Vessel (PSV)Offshore Supply Vessel (OSV)Workboat / TugCruise shipFerry
Certifications: IMO D‑2 Type Approval
Decision Guide: Choose if the vessel needs strong maneuverability or DP capability while also benefiting from reduced drag during transit, and when hull space is available for a retractable unit. Avoid if budget constraints are dominant, maintenance resources are limited, or the ship design cannot accommodate the retraction cavity.
Use Cases: Commonly installed on offshore support vessels for dynamic positioning during platform operations, on cruise ships and ferries to aid docking in tight ports, and on workboats that require both high thrust for maneuvering and low resistance while cruising.
Datasheet
Schottel SRP Thruster 800kW bow unverified
· 800.0 kW · retractable azimuth thruster
Power (kW)
800
Thrust (kN)
96.0
Diameter (mm)
1140
Type
azimuth
Location
bow
Strengths
  • Retractable design reduces hydrodynamic resistance during cruising, improving fuel efficiency.
  • Full 360° rotation provides excellent maneuverability for docking, DP operations and tight‑berth handling.
  • High thrust‑to‑power ratio (≈96 kN at 800 kW) suitable for medium‑size offshore and commercial vessels.
  • Integrated with standard DP control systems; Schottel’s patented low‑vibration propeller design reduces wear.
  • Compact footprint compared with fixed tunnel thrusters of similar power.
Weaknesses
  • Higher capital cost and more complex installation than a conventional fixed tunnel thruster.
  • Retractable mechanism adds maintenance tasks (actuator, seals, retraction bearings).
  • Requires hull penetration and structural reinforcement at the bow, impacting construction schedule.
  • Limited thrust at very high vessel speeds; best suited for low‑to‑moderate speed maneuvering.
  • Potential fouling of the propeller when retracted if not regularly inspected.
Typical Vessels: Offshore Supply Vessel (OSV)Dynamic Positioning (DP) vesselCruise shipFerryWind‑farm installation vessel
Decision Guide: Choose if the vessel needs high maneuverability and wants to minimise drag during transit – e.g., DP‑operated offshore workboats, cruise ships with frequent port calls, or wind‑farm installers. Avoid if budget constraints dominate, the ship has limited bow space for a retractable unit, or a simple fixed tunnel thruster meets the maneuvering requirements.
Use Cases: Commonly installed on offshore support vessels that require precise station‑keeping while also cruising long distances efficiently; used on cruise ships and ferries to aid docking in congested ports; fitted on wind‑farm installation ships for dynamic positioning during turbine placement.
Datasheet
Schottel SRP Thruster 800kW stern unverified
· 800.0 kW · retractable azimuth thruster
Power (kW)
800
Thrust (kN)
96.0
Diameter (mm)
1140
Type
azimuth
Location
stern
Strengths
  • Full 360° thrust vectoring gives excellent maneuverability and DP capability
  • Retractable design lowers hydrodynamic resistance during transit, improving fuel efficiency
  • Compact footprint fits into limited hull space, useful for retrofits
  • Robust Schottel bearing and gear system known for long service intervals
  • Easy access for inspection and maintenance via the retraction mechanism
Weaknesses
  • Higher initial purchase and installation cost compared with fixed propellers of similar power
  • Mechanical complexity (retraction hydraulics, bearings) increases potential failure points
  • Maximum thrust is lower than a dedicated fixed propeller of the same shaft power
  • Requires hull penetration and internal space for retraction gear, limiting layout options
  • Noise and vibration can be higher at full‑power azimuth angles
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS)Dynamic Positioning (DP) vesselCruise ship / FerryResearch or survey vessel
Certifications: DNVABS
Decision Guide: Choose if you need high‑precision maneuverability, DP capability, and want to minimise drag during cruising – especially on vessels with limited stern space. Avoid if budget is tight, the vessel operates mainly at constant speed where a fixed propeller gives better efficiency, or maintenance resources for retractable systems are limited.
Use Cases: The SRP 800 kW is typically deployed on offshore support ships that must hold position beside rigs, cruise liners docking in tight ports, and ferries requiring rapid bow‑to‑stern turning. Its retractable feature lets the vessel run efficiently on long transits while still providing powerful thrust for low‑speed maneuvers.
Datasheet
Schottel SRP Thruster 1000kW bow unverified
· 1000.0 kW · retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
120.0
Diameter (mm)
1300
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈120 kN at 1 MW) for strong maneuvering and DP capability
  • Retractable design reduces hydrodynamic resistance and protects the propeller in harsh environments
  • Compact footprint fits into limited hull spaces, enabling installation on a wide range of vessels
  • Integrated control system compatible with most ship‑automation suites
  • Proven reliability from extensive offshore and cruise‑ship applications
Weaknesses
  • Higher initial cost compared with fixed tunnel thrusters
  • More complex mechanical arrangement (retraction mechanism) increases maintenance requirements
  • Installation requires precise hull integration; not suitable for all hull forms
  • Partial‑power efficiency can be lower than a ducted propeller in some operating points
  • Noise and vibration must be carefully managed during installation
Typical Vessels: Offshore Support Vessel (OSV)Dynamic Positioning vesselCruise shipLNG carrierContainer shipResearch / Survey vessel
Certifications: DNV GL Class NotationABS Class ApprovalLR (Lloyd's Register) Type ApprovalIMO Type Approval for Azimuth Thrusters
Decision Guide: Choose if: you need high maneuverability or DP capability, want drag reduction when the thruster is not in use, and have sufficient budget for a retractable system. Avoid if: vessel design cannot accommodate the retraction mechanism, cost sensitivity outweighs performance benefits, or only low‑speed thrust is required.
Use Cases: The SRP 1000 is typically deployed on vessels that require precise station‑keeping such as offshore drilling support ships, on large cruise liners for tight harbor turns, and on ice‑class vessels where the ability to retract protects the propeller from ice impact. It also serves as a primary bow thruster on DP2/DP3 platforms needing rapid thrust vectoring.
Datasheet
Schottel SRP Thruster 1000kW stern unverified
· 1000.0 kW · retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
120.0
Diameter (mm)
1300
Type
azimuth
Location
stern
Strengths
  • Full 360° steering gives excellent maneuverability and dynamic positioning capability.
  • Retractable design reduces hull resistance and allows operation in shallow water or during transit.
  • Integrated motor‑propeller unit simplifies installation compared with separate shaft line solutions.
  • High thrust-to-power ratio for a 1000 kW unit, suitable for medium‑size vessels requiring strong bow/stern assistance.
  • Proven Schottel design with extensive service history and global support network.
Weaknesses
  • Higher initial cost and more complex hydraulic/electrical control system than fixed tunnel thrusters.
  • Maintenance access is more involved because the unit must be retracted for many inspections.
  • Potential for fouling or damage when deployed in debris‑rich environments.
  • Limited thrust compared with larger fixed propulsors of similar power if maximum bollard pull is required.
  • Requires dedicated space within the hull for the retraction mechanism, affecting internal layout.
Typical Vessels: Offshore Supply VesselPlatform Support VesselCruise ShipFerryContainer Ship (mid‑size)LNG Carrier (smaller class)
Certifications: DNV Type ApprovalIMO D-2
Decision Guide: Choose if you need high maneuverability, dynamic positioning and the ability to retract the thruster for reduced draft or transit efficiency. Ideal for vessels operating in shallow ports or requiring frequent switching between thrust and cruise mode. Avoid if budget constraints dominate, maintenance facilities are limited, or the vessel demands maximum continuous bollard pull that a fixed tunnel thruster can deliver more economically.
Use Cases: Commonly installed on offshore support ships to hold position beside rigs, on cruise liners for precise docking, and on ferries that operate in ports with shallow approaches. The retractable feature is also used on vessels that alternate between high‑speed transit (thruster retracted) and low‑speed maneuvering or DP operations (thruster deployed).
Datasheet
Schottel SRP Thruster 1200kW bow unverified
· 1200.0 kW · retractable azimuth thruster
Power (kW)
1200
Thrust (kN)
144.0
Diameter (mm)
1460
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈144 kN at 1200 kW)
  • Retractable design reduces hull resistance and fuel consumption during transit
  • 360° rotation gives excellent maneuverability for docking and DP operations
  • Compact installation footprint compared with conventional tunnel thrusters
  • Integrated control system compatible with most ship bridge consoles
Weaknesses
  • Higher capital cost than fixed tunnel or ducted thrusters
  • Complex hydraulic/mechanical retract mechanism adds maintenance requirements
  • Installation requires sufficient hull space and structural reinforcement
  • Efficiency drops at extreme azimuth angles compared with a dedicated tunnel thruster
  • Requires dedicated power supply and control wiring, increasing system integration effort
Typical Vessels: Cruise shipsContainer vesselsRo‑Ro ferriesOffshore support vessels (OSV)LNG carriers
Certifications: DNV
Decision Guide: Choose if the vessel needs high maneuverability and wants to minimise transit resistance by retracting the thruster when not in use, such as cruise ships or offshore support vessels operating frequently in confined ports. Avoid if budget constraints are tight, hull geometry cannot accommodate a retractable unit, or the operational profile does not justify the added complexity.
Use Cases: The SRP 1200 kW is typically deployed on large passenger and cargo ships that require precise low‑speed handling for berth approach, emergency maneuvering, and dynamic positioning during offshore operations. Its retractable feature is especially valuable on vessels that cruise at high speeds where drag reduction is critical.
Datasheet
Schottel SRP Thruster 1200kW stern unverified
· 1200.0 kW · retractable azimuth thruster
Power (kW)
1200
Thrust (kN)
144.0
Diameter (mm)
1460
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈0.12 kN/kW) for excellent manoeuvrability
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency
  • Full 360° rotation enables precise dynamic positioning and docking operations
  • Compact installation suitable for vessels with limited hull space
  • Proven Schottel reliability with integrated condition‑monitoring system
Weaknesses
  • Complex hull cut‑out and sealing requirements increase initial installation cost
  • Higher maintenance workload compared with fixed propellers due to moving gear and seals
  • Retractable mechanism adds weight high in the vessel, affecting stability calculations
  • Efficiency drops at very high ship speeds; best suited for low‑to‑moderate service speeds
  • Capital cost is higher than conventional shaft lines of comparable power
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS)Dynamic Positioning (DP) vesselCruise ship / ferry with high docking frequencyResearch or survey vessel requiring precise station‑keeping
Certifications: IMO Type Approval for Azimuth ThrustersDNV GL class notation (Propulsion Machinery – 2A)
Decision Guide: Choose if the vessel needs high manoeuvrability, DP capability or frequent docking and can benefit from reduced drag during cruising. Avoid if budget is tight, the ship operates primarily at high speeds where a fixed propeller is more efficient, or hull space does not allow for a retractable installation.
Use Cases: The SRP 1200 kW is commonly installed on offshore support ships that must hold position beside rigs, on AHTS units that need rapid thrust reversal for towing, and on cruise liners where the thruster can be retracted during voyages to save fuel while still providing powerful bow‑/stern‑side assistance when entering ports.
Datasheet
Schottel SRP Thruster 1500kW bow unverified
· 1500.0 kW · Retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
180.0
Diameter (mm)
1700
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈180 kN at 1500 kW)
  • Full 360° rotation gives excellent maneuverability and DP capability
  • Retractable design reduces drag during normal cruising, improving fuel efficiency
  • Compact footprint fits in a relatively small tunnel, suitable for vessels with limited hull space
  • Proven Schottel reliability and global service network
Weaknesses
  • Complex retract/extend mechanism increases maintenance requirements
  • Higher initial cost compared with fixed tunnel thrusters of similar power
  • Installation requires a dedicated tunnel and sealing system, limiting retrofit options
  • Fixed‑pitch propeller may be less efficient at very low speeds than variable‑pitch alternatives
  • Maximum thrust limited to ~180 kN; larger vessels may need higher‑power units
Typical Vessels: Offshore supply vesselDynamic positioning vesselCruise shipFerryLNG carrier (bow maneuvering)Container ship (maneuvering assistance)
Certifications: DNV GL
Decision Guide: Choose if you need high‑precision manoeuvring and want to keep cruising resistance low – e.g., DP‑class offshore vessels, cruise ships or ferries with space for a retractable tunnel. Avoid if budget is tight, the vessel cannot accommodate a dedicated tunnel, or the operational profile does not justify the added complexity.
Use Cases: Commonly deployed on offshore support ships for dynamic positioning, on cruise liners to aid docking in congested ports, and on fast ferries where the thruster can be retracted during high‑speed passages to preserve fuel economy.
Datasheet
Schottel SRP Thruster 1500kW stern unverified
· 1500.0 kW · Retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
180.0
Diameter (mm)
1700
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈180 kN at 1500 kW)
  • Retractable design lowers hull resistance and fuel consumption when the thruster is not needed
  • Full 360° thrust vectoring for excellent maneuverability and DP capability
  • Shaftless direct‑drive reduces vibration and noise
  • Compact installation suitable for vessels with limited aft space
Weaknesses
  • Complex raising/lowering mechanism adds maintenance requirements
  • Higher initial capital cost compared with fixed tunnel thrusters
  • Requires dedicated hull recess or tunnel, limiting retrofit options
  • Potential downtime if the retract system fails
  • Weight and hydraulic/pneumatic systems increase overall vessel weight
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS)Platform Supply Vessel (PSV)Cruise ShipLNG Carrier (DP‑enabled) Container feeder with DP requirements
Decision Guide: Choose if you need high maneuverability and the ability to retract the thruster for cruising efficiency, especially on DP‑equipped offshore or cruise vessels. Avoid if budget constraints prohibit the higher purchase/maintenance cost or if the hull cannot accommodate a retractable housing.
Use Cases: The SRP 1500 is commonly installed on offshore support ships performing dynamic positioning near rigs, cruise liners docking in tight ports, and LNG carriers that benefit from reduced drag during long transits while retaining DP capability when required.
Datasheet
Schottel SRP Thruster 2000kW bow unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
240.0
Diameter (mm)
2100
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈240 kN at 2000 kW)
  • Retractable duct reduces drag and improves fuel efficiency when not in use
  • Full 360° rotation gives excellent manoeuvring and DP capability
  • Modular design simplifies installation and maintenance
  • Low vibration and noise compared with fixed propeller thrusters
Weaknesses
  • Higher initial capital cost than conventional fixed bow thrusters
  • Requires dedicated hull space for the retraction housing and hydraulic/electrical systems
  • Complex control system increases commissioning time
  • Seal and bearing wear can be a maintenance concern in high‑cycle operation
  • Maximum thrust limited by duct diameter (2100 mm) – may be insufficient for very large vessels
Typical Vessels: Offshore supply vesselDynamic positioning vesselCruise shipContainer ship (mid‑size)LNG carrier (bow‑mounted)Bulk carrier with high manoeuvring demands
Decision Guide: Choose if the vessel needs strong, reversible thrust for DP or tight‑port manoeuvring and can accommodate a retractable housing to keep hull resistance low. Avoid if budget constraints dominate, space for retraction is unavailable, or a simpler fixed thruster meets the performance requirement.
Use Cases: Commonly installed on offshore support ships for dynamic positioning during drilling operations, on cruise liners for precise docking in congested ports, and on container or bulk carriers where a retractable bow thruster reduces drag while cruising but provides high thrust when needed for berthing.
Datasheet
Schottel SRP Thruster 2000kW stern unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
240.0
Diameter (mm)
2100
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈240 kN @ 2000 kW)
  • Retractable design reduces hydrodynamic resistance during transit
  • Full 360° rotation gives excellent maneuverability and DP capability
  • Proven Schottel reliability with integrated control electronics
  • Compact footprint compared with fixed tunnel thrusters
Weaknesses
  • Higher initial purchase and installation cost than a conventional tunnel thruster
  • Complex retraction mechanism adds maintenance tasks and potential failure points
  • Requires hull reinforcement and space for the housing unit
  • Not suitable as primary propulsion – limited to low‑speed thrust duties only
  • Noise and vibration levels can be higher than fixed units
Typical Vessels: Offshore supply vesselLNG carrierCruise shipContainer ship (DP equipped)Bulk carrier with dynamic positioning
Certifications: DNV GLABS
Decision Guide: Choose if the vessel needs high thrust for DP or tight‑maneuvering while keeping transit resistance low, and has sufficient hull space for a retractable unit. Avoid if budget is constrained, the ship lacks room for the retraction housing, or the thruster must serve as primary propulsion at higher speeds.
Use Cases: The SRP 2000 kW is typically installed on offshore support vessels and large commercial ships that require dynamic positioning during offshore operations, as well as on cruise liners and LNG carriers to aid berthing in confined ports while being retracted for open‑water cruising.
Datasheet
Schottel SRP Thruster 2500kW bow unverified
· 2500.0 kW · retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
300.0
Diameter (mm)
2500
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈300 kN at 2 500 kW) for strong manoeuvring capability
  • Retractable design eliminates hull resistance when the thruster is not required, improving fuel efficiency
  • Integrated hydraulic and electronic control system enables rapid azimuth positioning and DP integration
  • Compact tunnel footprint allows installation on vessels with limited bow space
  • Proven Schottel reliability and worldwide service network
Weaknesses
  • Complex retractable mechanism increases maintenance workload and requires regular inspection of seals and hydraulics
  • Higher upfront cost compared with fixed‑pitch bow thrusters of similar power
  • Installation demands a dedicated tunnel and structural reinforcement, limiting retrofit options on some hull forms
  • Potential for retraction failure in heavy seas if not properly maintained
Typical Vessels: Offshore supply vessel (OSV)Anchor handling tug supply (AHTS)LNG carrier with DPCruise shipFPSO support vesselContainer or bulk carrier equipped for dynamic positioning
Certifications: DNVABS
Decision Guide: Choose if: you need high thrust for precise manoeuvring or DP, want to minimise hull resistance when the thruster is idle, and have space for a retractable tunnel. Avoid if: budget constraints prohibit higher capital cost, the vessel lacks sufficient bow volume for a tunnel, or you prefer a simpler fixed‑pitch system with lower maintenance.
Use Cases: The SRP 2500 is commonly installed on offshore support ships that require rapid positioning for loading/offloading operations, on DP‑equipped tankers and LNG carriers to meet tight maneuvering tolerances in ports, and on cruise vessels where retractability helps preserve cruising efficiency while still providing strong low‑speed thrust for docking.
Datasheet
Schottel SRP Thruster 2500kW stern unverified
· 2500.0 kW · retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
300.0
Diameter (mm)
2500
Type
azimuth
Location
stern
Strengths
  • High thrust (≈300 kN) from a relatively compact 2.5 m diameter unit
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency
  • Full 360° thrust vectoring gives excellent maneuverability for dynamic positioning and low‑speed operations
  • Proven Schottel engineering with long service history and global support network
  • Modular installation allows retro‑fit to existing hulls with limited structural impact
Weaknesses
  • Higher capital cost compared with fixed tunnel or ducted thrusters of similar power
  • Complex hydraulic/mechanical drive system increases maintenance requirements and spare‑part inventory
  • Retractable mechanism adds weight aloft and requires regular inspection of sealing and guide rails
  • Installation demands hull penetration and reinforcement, extending construction time
  • Efficiency drops at very low ship speeds compared with dedicated tunnel thrusters
Typical Vessels: Offshore Supply Vessel (OSV)Platform Supply Vessel (PSV)Cruise ShipContainer ShipLNG CarrierFerry
Decision Guide: Choose if: you need high thrust for DP or tight‑berth manoeuvring and want to minimise added resistance during cruise; vessel has limited hull space for a fixed thruster; you value Schottel's global service support. Avoid if: budget constraints prohibit the higher upfront cost, the vessel operates primarily at very low speeds where tunnel thrusters are more efficient, or structural modifications for the retractable unit are impractical.
Use Cases: The SRP 2500 kW is commonly installed on offshore supply and platform vessels that require dynamic positioning while also needing to cruise efficiently. It is also fitted on larger passenger ships and container carriers where stern‑end maneuverability is critical but drag penalties must be limited during long voyages.
Datasheet
Schottel SRP Thruster 3000kW bow unverified
· 3000.0 kW · retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
360.0
Diameter (mm)
2900
Type
azimuth
Location
bow
Strengths
  • High thrust-to-power ratio (≈120 kN per MW) enables strong maneuvering forces.
  • Retractable design protects the unit from fouling and impact while cruising, reducing drag.
  • Full 360° rotation gives excellent steering flexibility for DP and close‑quarter docking.
  • Proven Schottel hydraulic control system integrates with ship bridge and DP consoles.
  • Modular installation allows retrofitting on existing hulls with minimal structural changes.
Weaknesses
  • Higher capital cost compared with fixed bow thrusters of similar power.
  • Complex hydraulic and retractable mechanisms increase maintenance workload.
  • Requires dedicated space in the bow and a robust shaft line, limiting use on very small vessels.
  • Potential for cavitation noise at high thrust settings, which may affect passenger comfort.
  • Weight and size (≈2.9 m diameter) can impact vessel stability if not properly accounted for.
Typical Vessels: Offshore Supply VesselDynamic Positioning TugCruise ShipContainer Ship (≥8,000 TEU)LNG CarrierFerry
Certifications: DNVABS
Decision Guide: Choose if you need high bow‑side thrust for DP2/DP3 operations, frequent port manoeuvring, or a hull‑protected thruster on a vessel with limited draft. Avoid if budget is tight, the ship lacks sufficient bow volume for the unit, or low‑noise operation is a primary requirement.
Use Cases: The SRP 3000 kW is commonly installed as a bow thruster on large offshore support vessels to maintain position during subsea operations, on cruise ships to aid docking in congested ports, and on ultra‑large container carriers for precise low‑speed manoeuvring when entering terminals.
Datasheet
Schottel SRP Thruster 3000kW stern unverified
· 3000.0 kW · retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
360.0
Diameter (mm)
2900
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈120 kN per MW) for a stern thruster of this size
  • Retractable design reduces hydrodynamic resistance and fuel consumption when the unit is not needed
  • Full 360° rotation gives excellent maneuverability and supports DP2/DP3 operations
  • Schottel’s proven control system integrates with most ship‑automation suites
  • Robust marine‑grade bearings and seal technology provide long service intervals
Weaknesses
  • Higher initial capital cost compared with fixed bow/stern thrusters of similar power
  • Complex retractable mechanism adds maintenance tasks and requires skilled technicians
  • Requires dedicated shaft line space and structural reinforcement in the hull
  • Noise and vibration levels can be higher than a conventional tunnel thruster, needing additional mitigation
  • Installation downtime is longer due to alignment of the azimuth pod and hydraulic systems
Typical Vessels: Offshore supply vessels (OSV)Dynamic positioning vessels (DP2/DP3)Cruise shipsLarge container or tanker with high maneuverability requirementsLNG carriers equipped for precise berthing
Decision Guide: Choose if you need a powerful stern thruster that can be retracted to lower drag and support dynamic positioning or tight‑berth maneuvers. Avoid if budget constraints dominate, the vessel lacks space for the retractable housing, or a simpler fixed thruster meets the maneuvering requirements.
Use Cases: Commonly installed on offshore support ships and cruise liners where DP capability is required; used for precise station‑keeping during offshore operations, rapid turning in confined ports, and as an emergency stop device when docked.
Datasheet
Schottel SPJ Thruster 100kW bow unverified
· 100.0 kW · retractable azimuth thruster
Power (kW)
100
Thrust (kN)
12.0
Diameter (mm)
580
Type
azimuth
Location
bow
Strengths
  • Retractable design eliminates drag during transit, improving fuel efficiency.
  • Compact 580 mm propeller diameter fits vessels with limited bow space.
  • High thrust‑to‑power ratio (12 kN at 100 kW) gives excellent low‑speed maneuverability.
  • Robust helical gear system with Schottel’s proven reliability and low maintenance intervals.
  • Standard control interface integrates easily with common ship automation and DP systems.
Weaknesses
  • Maximum thrust of 12 kN may be insufficient for larger vessels or high‑wind DP operations.
  • Retractable mechanism adds mechanical complexity and requires regular inspection.
  • 100 kW power demand necessitates dedicated generator capacity, limiting use on low‑power ships.
  • Installation requires structural reinforcement in the bow, increasing initial build cost.
Typical Vessels: Offshore Supply VesselPlatform Support VesselFerryCruise ShipSmall Container Feeder
Certifications: DNVABS
Decision Guide: Choose if you need high maneuverability with limited bow space and want to minimise drag during cruising – ideal for DP‑1 offshore vessels, ferries or cruise ships that benefit from a retractable unit. Avoid if the vessel requires higher bollard pull than 12 kN, prefers a simpler fixed thruster, or has strict weight/maintenance constraints.
Use Cases: Commonly installed on the bow of DP‑capable offshore supply and platform support vessels for station‑keeping, as well as on ferries and cruise ships for berth assistance and low‑speed docking. The retractable feature is especially valued on vessels that spend long periods underway where drag reduction is critical.
Datasheet
Schottel SPJ Thruster 100kW stern unverified
· 100.0 kW · retractable azimuth thruster
Power (kW)
100
Thrust (kN)
12.0
Diameter (mm)
580
Type
azimuth
Location
stern
Strengths
  • Retractable design reduces drag and improves fuel efficiency when the thruster is not needed
  • Full 360° rotation gives excellent maneuverability for low‑speed operations and DP tasks
  • Compact size (580 mm diameter) fits well on small to medium vessels with limited hull space
  • Modular construction simplifies installation, inspection and maintenance
  • Low acoustic signature compared with conventional fixed thrusters
Weaknesses
  • Maximum thrust of ~12 kN limits use on larger ships or high‑power DP applications
  • Retractable mechanism adds mechanical complexity and requires regular seal inspections
  • Higher upfront cost than a comparable fixed (non‑retractable) azimuth unit
  • Power rating 100 kW may be insufficient for vessels with heavy maneuvering demands
  • Limited availability of spare parts in remote regions compared with more common larger thrusters
Typical Vessels: Offshore supply vesselWorkboat / tug‑assist boatCoastal ferrySmall tanker or product carrierDredgerCruise ship tender
Certifications: DNV GL class approvalABS class approvalLloyd's Register type approval
Decision Guide: Choose if: you need a compact, retractable thruster for vessels where hull resistance matters, DP‑1/DP‑2 capability is required at modest thrust levels, and space constraints limit fixed installations. Avoid if: the vessel demands higher thrust (>12 kN), continuous high‑power maneuvering, or operates in environments where the added mechanical complexity of a retractable unit poses reliability concerns.
Use Cases: The SPJ 100 kW is typically installed on offshore support ships for precise positioning during cargo transfer, on coastal ferries to improve docking manoeuvres, and on workboats that require both high maneuverability and reduced drag when cruising. Its retractable feature is especially valued in shallow‑draft vessels that need to minimize underwater appendages while underway.
Datasheet
Schottel SPJ Thruster 200kW bow unverified
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
24.0
Diameter (mm)
660
Type
azimuth
Location
bow
Strengths
  • Retractable design eliminates hull resistance during normal sailing, improving fuel efficiency.
  • Compact installation footprint suitable for vessels with limited bow space.
  • High thrust‑to‑power ratio (≈24 kN at 200 kW) provides strong low‑speed maneuverability.
  • Integrated motor‑gear unit simplifies maintenance and reduces auxiliary systems.
Weaknesses
  • Retractable mechanism adds mechanical complexity and requires regular inspection.
  • Maximum thrust limited to ~24 kN, unsuitable for high‑power tug or large DP applications.
  • Initial procurement cost higher than fixed bow thrusters of similar power.
  • Installation requires structural reinforcement in the hull bow area.
Typical Vessels: Offshore supply vesselCoastal ferryResearch / survey shipSmall container or bulk carrier (≤30 kt service speed)Cruise ship (mid‑size) for improved docking performance
Decision Guide: Choose if: you need a maneuvering aid that can be fully retracted to minimise drag, vessel size limits bow space, and required thrust is ≤24 kN at around 200 kW. Avoid if: the ship demands higher thrust levels, operates continuously in DP‑high mode, or you prefer a simpler fixed thruster with lower upfront cost.
Use Cases: Commonly installed on offshore support vessels for port entry/exit, dynamic positioning (DP0/1) stations, and cruise ships where reduced drag during cruising is valuable. Also used on coastal ferries to improve docking precision while keeping hull resistance low when underway.
Datasheet
Schottel SPJ Thruster 200kW stern unverified
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
24.0
Diameter (mm)
660
Type
azimuth
Location
stern
Strengths
  • Full 360° rotation gives excellent maneuverability for docking and DP operations.
  • Retractable design eliminates hull resistance and protects the propeller during transit, improving fuel efficiency.
  • Compact 660 mm diameter fits in relatively small hull spaces, suitable for medium‑size vessels.
  • High thrust‑to‑power ratio (≈24 kN at 200 kW) for a unit of this size.
  • Ducted propeller reduces cavitation and underwater noise.
Weaknesses
  • Retract/extend mechanism adds mechanical complexity and requires regular maintenance.
  • Maximum thrust is lower than that of larger fixed tunnel or azimuth thrusters, limiting use on high‑power vessels.
  • Initial purchase price is higher than simple tunnel thrusters of comparable power.
  • Efficiency drops at higher ship speeds because the ducted propeller is optimised for low‑speed manoeuvring.
  • Installation requires a dedicated housing and sealing system, increasing retrofit effort.
Typical Vessels: Offshore supply vesselFerry (short‑route)Small tanker (<10 000 DWT)Container feederCruise ship auxiliary thruster
Decision Guide: Choose if you need high‑precision low‑speed manoeuvring, want to minimise drag when the thruster is not in use, and have space for a retractable housing. Avoid if the vessel operates primarily at higher speeds, budget constraints limit upfront cost, or you prefer a simpler, lower‑maintenance solution.
Use Cases: The SPJ 200 kW is typically deployed on vessels that require frequent docking, dynamic positioning for offshore work, or emergency manoeuvring in confined ports. Its retractable feature makes it popular where hull resistance must be kept low during long transits while still providing strong thrust when needed.
Datasheet
Schottel SPJ Thruster 300kW bow unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
36.0
Diameter (mm)
740
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈36 kN at 300 kW)
  • Retractable design reduces hull resistance and protects the unit during transit
  • Full 360° rotation provides excellent maneuverability for DP or low‑speed operations
  • Compact 740 mm diameter fits into narrow hull sections
  • Integrated control system compatible with most dynamic positioning packages
Weaknesses
  • Limited to ~300 kW, unsuitable for high‑power DP on large vessels
  • Retractable mechanism adds mechanical complexity and maintenance requirements
  • Higher initial cost compared with fixed tunnel thrusters of similar power
  • Potentially higher noise and vibration at full thrust due to exposed propeller
  • Requires a dedicated hull opening and sealing arrangement
Typical Vessels: Offshore supply vesselSmall anchor handling tug supply (AHTS)Research vesselFerryCruise ship (DP‑1 class)Medium‑size dredger
Decision Guide: Choose if you need a compact, high‑maneuverability thruster on vessels where hull drag must be minimised when the unit is not in use, such as offshore supply ships or DP‑1 ferries. Avoid if the vessel requires higher thrust levels (>300 kW) or if you prefer a simpler fixed tunnel solution with lower upfront cost.
Use Cases: The SPJ 300 kW is typically installed on the bow of medium‑size offshore vessels to provide precise station‑keeping during offshore operations, aid in low‑speed docking, and support dynamic positioning for research or passenger transport. Its retractable feature makes it attractive for ships that spend long periods cruising at speed, as the thruster can be stowed to reduce resistance.
Datasheet
Schottel SPJ Thruster 300kW stern unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
36.0
Diameter (mm)
740
Type
azimuth
Location
stern
Strengths
  • High maneuverability with 360° thrust vectoring
  • Retractable design reduces hull resistance when not in use, saving fuel
  • Compact size suitable for vessels with limited draft or hull space
  • Integrated duct improves propulsive efficiency at low speeds
  • Proven Schottel reliability and global service network
Weaknesses
  • Mechanical complexity leads to higher maintenance intervals compared with fixed thrusters
  • Initial purchase cost is higher than a conventional tunnel thruster of similar power
  • Maximum thrust (36 kN) may be insufficient for large tugs or high‑power DP applications
  • Retract/extend actuation system requires dedicated hydraulic/electrical supply
  • Potential for fouling in the duct when operating in heavy algae or sediment areas
Typical Vessels: Offshore Supply Vessel (OSV)Workboat / Crew Transfer VesselSmall to medium‑size TugFerry (stern thruster for docking)Dynamic Positioning support vessel
Certifications: DNV
Decision Guide: Choose if you need precise low‑speed maneuvering, a shallow‑draft solution, or the ability to retract the thruster to minimise drag during transit. Avoid if your vessel requires very high thrust levels, has limited budget for capital equipment, or cannot accommodate the additional hydraulic/electrical systems required for actuation.
Use Cases: The SPJ 300 kW is commonly installed on offshore supply ships that need tight station‑keeping while loading rigs, on ferries that require rapid bow‑to‑stern turning in confined ports, and on workboats that operate in shallow harbours where a retractable unit avoids hull damage and reduces fuel consumption when cruising.
Datasheet
Schottel SPJ Thruster 400kW bow unverified
· 400.0 kW · retractable azimuth thruster
Power (kW)
400
Thrust (kN)
48.0
Diameter (mm)
820
Type
azimuth
Location
bow
Strengths
  • High manoeuvrability thanks to full 360° rotation of the nozzle
  • Retractable design reduces draft and protects the unit in shallow water or during transit
  • Compact diameter (820 mm) fits vessels with limited hull space
  • Integrated control system compatible with most DP packages
  • Low vibration and noise due to direct‑drive motor
Weaknesses
  • Thrust rating (48 kN) is lower than that of larger fixed tunnel thrusters of similar power
  • Moving mechanical parts increase maintenance intervals compared with static tunnel units
  • Higher initial cost than basic fixed bow thrusters
  • Retractable mechanism adds complexity to hull reinforcement and installation
  • Limited to the 400 kW power class; not suitable for high‑power DP vessels
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS) – smallCoastal Container ShipFerry / Ro‑Ro vesselResearch / Survey vesselWind farm installation support ship
Certifications: DNV GL Class
Decision Guide: Choose if you need a compact, retractable bow thruster that offers full azimuth thrust for tight port manoeuvring or shallow‑water operations and can be integrated into DP systems. Avoid if the vessel requires very high thrust levels, has a strict budget constraint, or prefers the lower maintenance of a fixed tunnel thruster.
Use Cases: Commonly installed on offshore support vessels operating near wind farms, ferries docking in congested harbours, coastal cargo ships that must navigate shallow drafts, and research vessels that need precise positioning for scientific work. The retractable feature allows the unit to be stowed during open‑sea transits to reduce drag.
Datasheet
Schottel SPJ Thruster 400kW stern unverified
· 400.0 kW · retractable azimuth thruster
Power (kW)
400
Thrust (kN)
48.0
Diameter (mm)
820
Type
azimuth
Location
stern
Strengths
  • High thrust-to-power ratio (≈48 kN @ 400 kW)
  • Retractable design reduces hydrodynamic resistance during transit
  • Full 360° rotation gives excellent maneuverability and DP capability
  • Compact diameter (820 mm) fits in vessels with limited hull space
Weaknesses
  • Limited absolute thrust compared with larger fixed tunnel thrusters, unsuitable for very large ships
  • Mechanical retract/extend system adds complexity and maintenance requirements
  • Higher initial purchase price than a comparable fixed‑pitch thruster
  • Seal and bearing wear can become critical if the unit is frequently cycled
Typical Vessels: Offshore supply vesselDP‑class tugboatRo‑Ro ferryCruise ship (stern maneuvering)Small container or bulk carrier with DP requirement
Certifications: DNV Type Approval
Decision Guide: Choose if you need a high‑maneuverability stern thruster that can be retracted to save fuel and protect the propeller, especially on vessels requiring dynamic positioning or frequent docking in confined ports. Avoid if the vessel demands higher absolute thrust, prefers a simpler fixed installation, or has strict budget constraints for propulsion equipment.
Use Cases: Commonly installed on offshore support ships for precise station‑keeping, on ferries to aid rapid berthing and unberthing, and as a secondary maneuvering thruster on DP‑equipped container or bulk carriers where drag reduction during cruising is valuable.
Datasheet
Schottel SPJ Thruster 500kW bow unverified
· 500.0 kW · retractable azimuth thruster
Power (kW)
500
Thrust (kN)
60.0
Diameter (mm)
900
Type
azimuth
Location
bow
Strengths
  • Retractable design reduces hull resistance when not in use, improving fuel efficiency.
  • Full 360° rotation gives superior manoeuvrability and DP capability compared with fixed tunnel thrusters.
  • Compact pod size (≈900 mm diameter) fits into limited bow space on medium‑size vessels.
  • Integrated control system allows rapid thrust response and precise positioning.
  • Proven Schottel reliability with modular maintenance access.
Weaknesses
  • Higher initial purchase and installation cost than conventional tunnel thrusters.
  • Retract/extend mechanism adds mechanical complexity and requires regular inspection.
  • Requires dedicated hull space for the retraction housing, limiting retro‑fit options on some ships.
  • Maximum thrust limited to ~60 kN; may be insufficient for very large DP‑2 vessels.
  • Potential cavitation at high RPM in shallow water conditions.
Typical Vessels: Offshore supply vesselAnchor handling tug supply (AHTS)DP‑enabled research or survey shipFerry / Ro‑Ro vesselSmall cruise ship
Decision Guide: Choose if you need high manoeuvrability, DP capability and want to minimise drag when the thruster is not in use. Avoid if budget constraints favour a simpler fixed tunnel thruster or if the vessel lacks space for the retraction housing.
Use Cases: Commonly installed on offshore support vessels for dynamic positioning during drilling or ROV operations, as well as on ferries and small cruise ships to aid tight‑harbor docking and emergency manoeuvres.
Datasheet
Schottel SPJ Thruster 500kW stern unverified
· 500.0 kW · retractable azimuth thruster
Power (kW)
500
Thrust (kN)
60.0
Diameter (mm)
900
Type
azimuth
Location
stern
Strengths
  • Retractable design lowers hull resistance and allows operation in shallow water when retracted.
  • Full 360° rotation gives excellent maneuverability for docking, DP and emergency stopping.
  • High thrust‑to‑power ratio (≈60 kN at 500 kW) for its size class.
  • Compact installation footprint – suitable for vessels with limited hull space.
  • Integrated control system compatible with most ship bridge automation packages.
Weaknesses
  • Higher capital cost than fixed tunnel thrusters of comparable power.
  • Moving mechanical parts increase maintenance intervals and require skilled service personnel.
  • Maximum thrust (≈60 kN) may be insufficient for very large vessels or high‑power DP applications.
  • Installation often requires hull reinforcement, adding to construction time and cost.
  • Power rating limited to 500 kW – not suitable where >1 MW thrusters are required.
Typical Vessels: Offshore supply vesselLNG carrier (mid‑size)Cruise ship (auxiliary maneuvering)FerryContainer feeder
Certifications: DNVGL Class ApprovalABS Classification
Decision Guide: Choose if the vessel needs high manoeuvrability in confined ports, shallow‑water capability, or dynamic positioning with a compact thruster that can be retracted to improve cruising efficiency. Avoid if the required thrust exceeds ~70 kN, budget constraints prohibit higher upfront cost, or the hull design cannot accommodate the retractable housing and associated reinforcement.
Use Cases: The SPJ 500 kW is typically installed on vessels that operate frequently in tight harbours or offshore terminals, where rapid bow‑to‑stern thrust changes are needed for docking, undocking, and DP‑1 operations. Its retractable feature is also exploited on ships that spend long periods at sea, allowing the thruster to be hidden to minimise drag and protect it from fouling.
Datasheet
Schottel SPJ Thruster 600kW bow unverified
· 600.0 kW · retractable azimuth thruster
Power (kW)
600
Thrust (kN)
72.0
Diameter (mm)
980
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈72 kN at 600 kW) gives excellent manoeuvrability.
  • Retractable design reduces hull resistance when the thruster is not in use, improving fuel efficiency.
  • Compact footprint fits into limited bow space on modern vessels.
  • Integrated hydraulic and electronic control system compatible with DP‑2/DP‑3 setups.
  • Low vibration and noise levels compared with conventional fixed propellers.
Weaknesses
  • More complex mechanical/hydraulic arrangement leads to higher maintenance requirements than a fixed tunnel thruster.
  • Initial procurement cost is higher due to retractable mechanism and control electronics.
  • Requires dedicated bow space for retraction housing, limiting installation options on very small vessels.
  • Performance can be limited in heavy sea states if the retracted unit is not fully protected.
Typical Vessels: Offshore Supply Vessel (OSV)Dynamic Positioning vesselCruise shipContainer shipRo‑Ro ferry
Certifications: DNV
Decision Guide: Choose if the vessel needs high manoeuvrability, DP capability and wants to minimise drag when the thruster is idle. Avoid if budget or maintenance resources are limited, or if a simple fixed tunnel thruster meets the maneuvering requirements.
Use Cases: Commonly installed as a bow thruster on offshore support vessels for precise station‑keeping during offshore operations, on cruise ships for tight docking manoeuvres, and on container carriers to aid berthing in congested ports. The retractable feature is especially valued on vessels that spend long periods underway at speed.
Datasheet
Schottel SPJ Thruster 600kW stern unverified
· 600.0 kW · retractable azimuth thruster
Power (kW)
600
Thrust (kN)
72.0
Diameter (mm)
980
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈72 kN at 600 kW)
  • Retractable design reduces hydrodynamic resistance during transit
  • Compact footprint suitable for vessels with limited hull space
  • Fast 360° rotation enables precise maneuvering and DP operations
  • Ducted propeller gives good low‑speed efficiency and reduced cavitation
Weaknesses
  • Mechanical retraction system adds complexity and maintenance requirements
  • Hull penetration needed for the retractable shaft, increasing installation cost
  • Higher upfront capital cost compared with fixed bow/stern thrusters of similar power
  • Limited maximum thrust compared with larger fixed azimuth units
  • Access for inspection can be restricted when the unit is retracted
Typical Vessels: Offshore Support VesselPlatform Supply VesselAnchor Handling Tug SupplyCruise ShipFerry
Decision Guide: Choose if the vessel needs high maneuverability, dynamic positioning capability and wants to minimise drag during cruising by retracting the thruster. Avoid if budget is tight, installation space for a retraction system is unavailable, or the operational profile does not require frequent low‑speed thrust direction changes.
Use Cases: Commonly installed on offshore support ships for DP‑hold, harbor entry/exit, and precise station‑keeping alongside rigs. Also used on cruise liners and ferries to aid docking and improve fuel efficiency by stowing the thruster when underway.
Datasheet
Schottel SPJ Thruster 800kW bow unverified
· 800.0 kW · retractable azimuth thruster
Power (kW)
800
Thrust (kN)
96.0
Diameter (mm)
1140
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈96 kN at 800 kW) for excellent maneuverability
  • Retractable design reduces drag and fuel consumption during transit
  • Compact pod footprint fits in limited hull space, ideal for DP‑equipped vessels
  • Fast azimuth rotation enables 360° thrust vectoring for precise positioning
  • Proven Schottel reliability with modular maintenance access
Weaknesses
  • Higher initial purchase and installation cost compared with fixed tunnel thrusters
  • More complex mechanical retract/extend system increases maintenance requirements
  • Requires dedicated hull space and structural reinforcement for the retraction tube
  • Potential for corrosion or fouling in the retractable mechanism if not regularly serviced
  • Limited redundancy if only a single bow unit is installed
Typical Vessels: Offshore Supply Vessel (OSV)Dynamic Positioning vesselCruise shipFerryResearch / Survey vesselSmall container or bulk carrier with DP requirement
Certifications: DNVGL Type ApprovalABS Classification
Decision Guide: Choose if: the vessel needs high‑precision maneuvering, dynamic positioning, and wants to minimise transit resistance by retracting the thruster. Avoid if: budget constraints dominate, hull form cannot accommodate a retraction tube, or only basic low‑speed docking assistance is required.
Use Cases: Commonly installed on offshore support ships that hold position beside rigs, cruise liners docking in tight ports, and ferries that require rapid side thrust for quick turnarounds while still benefiting from reduced drag during cruising.
Datasheet
Schottel SPJ Thruster 800kW stern unverified
· 800.0 kW · retractable azimuth thruster
Power (kW)
800
Thrust (kN)
96.0
Diameter (mm)
1140
Type
azimuth
Location
stern
Strengths
  • High maneuverability with 360° thrust direction
  • Retractable design reduces hydrodynamic resistance during cruising
  • Compact installation fits vessels with limited hull space
  • Easy access for inspection and maintenance via the retracting mechanism
Weaknesses
  • Higher purchase and installation cost than fixed tunnel thrusters of similar power
  • Complex hydraulic/electrical retraction system adds potential failure points
  • Maximum thrust is lower than a comparable fixed tunnel thruster at the same power rating
  • Requires regular sealing checks to prevent water ingress
Typical Vessels: Offshore Supply VesselFerryCruise Ship (mid‑size)Container ship (up to 5,000 gt)Bulk carrier (small to medium)
Certifications: DNV
Decision Guide: Choose if you need precise low‑speed maneuvering, have limited hull space, and want the ability to retract the thruster to improve fuel efficiency on open water. Avoid if budget is constrained, maximum thrust is critical for heavy docking operations, or you prefer a simpler fixed‑install solution with fewer moving parts.
Use Cases: Commonly installed on offshore supply vessels for dynamic positioning, ferries and cruise ships for tight port turns, and small container or bulk carriers where a retractable thruster offers maneuvering benefits without sacrificing cruising performance.
Datasheet
Schottel SPJ Thruster 1000kW bow unverified
· 1000.0 kW · Retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
120.0
Diameter (mm)
1300
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈120 kN @ 1 MW) for strong low‑speed manoeuvring
  • Retractable design reduces hydrodynamic resistance and fuel consumption when the thruster is not required
  • Compact diameter (≈1.3 m) fits into relatively small tunnel spaces, enabling installation on a wide range of vessels
  • DP‑ready control system compatible with standard dynamic positioning packages
  • Robust Schottel gear design offers proven reliability and straightforward maintenance
Weaknesses
  • Higher initial purchase and installation cost compared with fixed bow thrusters
  • Retract/extend mechanism adds mechanical complexity and requires regular inspection of seals and hydraulic systems
  • Installation demands a dedicated tunnel and structural reinforcement, limiting retrofit options on some hulls
  • Off‑design efficiency drops when operating at speeds far from the design point due to fixed‑pitch propeller
  • Spare parts inventory can be larger because of the specialised retraction gear
Typical Vessels: Offshore supply vesselDP2/DP3 platform support shipCruise liner (mid‑size)FerryLarge workboat / anchor handling tug
Certifications: IMO Type ApprovalDNV Class Notified Equipment
Decision Guide: Choose if you need strong low‑speed manoeuvring with dynamic positioning capability and want to minimise hull resistance when the thruster is idle. Avoid if budget constraints are tight, the vessel cannot accommodate a retractable tunnel, or the operational profile does not require high thrust or DP functionality.
Use Cases: The SPJ 1000 kW is typically deployed on offshore support vessels for precise station‑keeping during ROV operations, on cruise ships and ferries to aid docking in tight ports, and on DP‑equipped workboats that need rapid lateral thrust while maintaining low drag during transit.
Datasheet
Schottel SPJ Thruster 1000kW stern unverified
· 1000.0 kW · retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
120.0
Diameter (mm)
1300
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈120 kN at 1000 kW) suitable for DP2/3 operations
  • Retractable design lowers hull resistance and improves fuel efficiency when the thruster is stowed
  • 360° rotatable nozzle provides excellent maneuverability in tight ports or offshore stations
  • Proven Schottel hydraulic drive system offers reliable service and easy maintenance
  • Integrated control package compatible with most vessel DP controllers
Weaknesses
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power
  • Mechanical deployment/retraction mechanism adds complexity and requires regular inspection
  • Requires dedicated space in the engine room for hydraulic pumps and control electronics
  • Installation depth limits may restrict use on vessels with very shallow drafts
  • Potential for seal wear at the retractable bearing, leading to increased maintenance intervals
Typical Vessels: Offshore Support Vessel (OSV)Drillship / FPSOLNG CarrierCruise ShipLarge Container or Bulk carrier with DP requirements
Certifications: DNVABS
Decision Guide: Choose if you need high thrust for dynamic positioning, want the drag‑reduction benefit of a retractable unit, and can accommodate the extra hydraulic/mechanical systems. Avoid if budget is tight, vessel layout cannot house the retraction mechanism, or the operational profile does not require DP or frequent low‑speed maneuvering.
Use Cases: The SPJ 1000 kW is typically deployed on offshore vessels that must hold position in harsh sea states, on large passenger ships for precise docking, and on high‑value cargo carriers where fuel savings from a stowed thruster are economically justified. It is also used on drillships and FPSOs to supplement main propulsion during station‑keeping.
Datasheet
Schottel SPJ Thruster 1200kW bow unverified
· 1200.0 kW · retractable azimuth thruster
Power (kW)
1200
Thrust (kN)
144.0
Diameter (mm)
1460
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈0.12 kN/kW) for excellent maneuverability and DP performance.
  • Retractable design reduces hydrodynamic resistance during normal cruising, improving fuel efficiency.
  • Compact installation footprint; can be fitted to vessels with limited hull space at bow or stern.
  • Integrated Schottel control system provides precise 360° thrust vectoring and fast response.
  • Proven class approvals (DNV, ABS) and extensive service history on offshore support ships.
Weaknesses
  • Higher upfront cost compared with fixed tunnel thrusters of similar power.
  • Retract/extend mechanism adds mechanical complexity and requires regular inspection of seals and hydraulic components.
  • Installation may require structural reinforcement of the hull to accommodate retraction housing.
  • Noise and vibration levels can be higher than ducted thrusters, requiring additional mitigation on passenger vessels.
  • Maintenance downtime can be longer if the retraction system fails.
Typical Vessels: Offshore Support Vessel (OSV)Dynamic Positioning vesselDrillship / FPSOCruise ship (bow thruster)LNG carrier with DP requirement
Certifications: DNVABS
Decision Guide: Choose if the vessel needs high maneuverability, dynamic positioning capability and wants to minimise drag during transit – especially for offshore workboats, drillships or cruise ships where a retractable bow thruster adds operational flexibility. Avoid if budget constraints dominate, hull form cannot accommodate the retraction housing, or the vessel operates primarily in low‑maneuverability environments where a simpler fixed tunnel thruster would suffice.
Use Cases: The SPJ 1200 kW is commonly installed on offshore wind installation vessels for precise station‑keeping, on drillships and FPSOs to maintain position during drilling operations, and on cruise ships to aid docking while being retracted when sailing to reduce fuel consumption. It also serves as a bow thruster on DP‑class tankers and LNG carriers that require both high thrust and low cruising resistance.
Datasheet
Schottel SPJ Thruster 1200kW stern unverified
· 1200.0 kW · retractable azimuth thruster
Power (kW)
1200
Thrust (kN)
144.0
Diameter (mm)
1460
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈144 kN at 1200 kW) for strong manoeuvring capability
  • Retractable design reduces drag when the unit is not in use, improving fuel efficiency
  • 360° steerability combines propulsion and steering in a single compact package
  • Proven reliability on offshore DP vessels with integrated control systems
  • Relatively quick installation and retrofit compared to tunnel thrusters
Weaknesses
  • Higher initial cost and lifecycle maintenance than fixed tunnel thrusters
  • Mechanical retraction mechanism adds complexity and potential failure points
  • Requires sufficient hull space for the retracted housing, limiting use on very shallow drafts
  • Efficiency drops at low ship speeds compared with dedicated tunnel or ducted thrusters
  • Noise and vibration levels can be higher than some fixed‑pitch alternatives
Typical Vessels: Offshore Supply Vessel (OSV)Dynamic Positioning (DP) vesselFPSO support shipLNG carrier with DP requirementsCruise ship maneuvering aid
Decision Guide: Choose if you need high thrust for DP or tight‑maneuvering operations and want the drag‑reduction benefit of a retractable unit. Avoid if budget is limited, hull space for retraction is insufficient, or a simpler fixed tunnel thruster meets performance needs.
Use Cases: The SPJ 1200 kW is typically deployed on offshore support vessels that require precise station‑keeping during drilling or subsea operations, as well as on large passenger or cargo ships needing enhanced low‑speed manoeuvrability in ports and confined waterways. Its retractable feature allows the vessel to cruise efficiently when DP is not required.
Datasheet
Schottel SPJ Thruster 1500kW bow unverified
· 1500.0 kW · retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
180.0
Diameter (mm)
1700
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈180 kN at 1500 kW) for strong maneuverability
  • Retractable design reduces hull resistance and fuel consumption during cruise
  • Full 360° thrust vectoring enables precise dynamic positioning and tight berth handling
  • Compact pod layout frees deck space compared with traditional tunnel thrusters
  • Proven Schottel hydraulic drive offers smooth, low‑vibration operation
Weaknesses
  • Complex retraction mechanism adds installation cost and requires regular inspection
  • Maintenance access is more involved than fixed tunnel thrusters, especially when retracted
  • Requires a hull opening; not suitable for vessels without structural accommodation
  • Higher initial purchase price relative to conventional bow tunnels of similar power
  • Potential for fouling or damage to the retractable housing in heavy debris environments
Typical Vessels: Offshore Supply Vessel (OSV)Cruise ShipRo‑Ro FerryLarge Container ShipLNG Carrier (mid‑size)
Decision Guide: Choose if the vessel needs high bow thrust for DP or tight port maneuvers and can accommodate a hull opening to benefit from reduced drag when cruising. Avoid if budget is limited, the ship design cannot integrate a retractable pod, or operating conditions involve heavy debris that could impair the retraction system.
Use Cases: The SPJ is commonly installed on offshore support vessels for dynamic positioning during subsea operations, on cruise ships and ferries to aid rapid berthing in confined ports, and on large container or LNG carriers where a retractable thruster reduces fuel burn while still providing strong low‑speed maneuverability.
Datasheet
Schottel SPJ Thruster 1500kW stern unverified
· 1500.0 kW · retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
180.0
Diameter (mm)
1700
Type
azimuth
Location
stern
Strengths
  • High thrust-to-power ratio (≈180 kN at 1500 kW)
  • Retractable design reduces hydrodynamic resistance and protects the propeller in open sea
  • Full 360° rotation enables precise maneuvering and dynamic positioning support
  • Compact installation fits vessels with limited hull space or low draft
  • Schottel’s global service network ensures spare‑part availability and technical support
Weaknesses
  • Higher capital cost compared with fixed tunnel thrusters
  • More moving parts increase maintenance complexity and inspection frequency
  • Requires dedicated hydraulic/electrical power supply and integration with vessel control systems
  • Retractable mechanism can be prone to fouling if not regularly cleaned
  • Hull opening for retraction limits use on vessels without suitable structural arrangement
Typical Vessels: Platform Supply VesselAnchor Handling Tug Supply (AHTS)Offshore Construction VesselMultipurpose Support VesselDynamic Positioning vessel
Certifications: IMO D-2DNV GL
Decision Guide: Choose if you need high thrust in a limited hull space, require DP‑grade maneuverability, and want the drag reduction of a retractable unit. Avoid if budget constraints dominate, maintenance resources are limited, or the vessel cannot accommodate the required hull opening for retraction.
Use Cases: The SPJ 1500 kW is typically installed on offshore support ships that perform frequent close‑quarter maneuvers, such as loading/offloading from rigs, anchor handling, and dynamic positioning during subsea operations. Its retractable feature is valuable for vessels that spend long transits at sea, allowing the thruster to be stowed to improve fuel efficiency.
Datasheet
Schottel SPJ Thruster 2000kW bow unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
240.0
Diameter (mm)
2100
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (240 kN at 2000 kW) for strong maneuvering capability
  • Retractable design reduces hull resistance and allows operation in shallow water
  • Full 360° thrust vectoring improves dynamic positioning performance
  • Compact footprint suitable for vessels with limited bow space
  • Proven Schottel hydraulic drive system known for reliability
Weaknesses
  • Higher initial capital cost compared with fixed‑pitch bow thrusters
  • Complex hydraulic and retraction mechanisms increase maintenance requirements
  • Requires sufficient hull volume and structural reinforcement for the retractable unit
  • Potential cavitation at high RPM if not properly matched to vessel speed profile
  • Specialized crew training needed for operation and troubleshooting
Typical Vessels: Offshore supply vesselsDynamic positioning (DP) shipsCruise linersContainer shipsLNG carriersWind‑farm installation vessels
Decision Guide: Choose if the vessel needs high thrust bow maneuverability, operates in shallow or restricted drafts, and benefits from reduced drag when the thruster is retracted (e.g., DP‑equipped offshore or cruise ships). Avoid if budget constraints dominate, the ship lacks space for a retractable unit, or the operator prefers simpler fixed‑pitch systems with lower maintenance overhead.
Use Cases: The SPJ 2000 kW is typically installed on large vessels that require precise low‑speed handling and dynamic positioning, such as offshore support ships navigating tight ports, cruise ships docking in constrained harbours, and wind‑farm installation vessels that need both high thrust for station‑keeping and a retracted profile during transit.
Datasheet
Schottel SPJ Thruster 2000kW stern unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
240.0
Diameter (mm)
2100
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈240 kN at 2000 kW) suitable for large vessels
  • Retractable design reduces draft and hull resistance when not in use
  • Full 360° rotation gives excellent maneuvering and DP capability
  • Robust ducted propeller provides good cavitation resistance and efficiency
  • Proven Schottel engineering with extensive service network
Weaknesses
  • Complex hydraulic/mechanical drive system increases maintenance requirements
  • Higher initial cost compared with fixed bow thrusters of similar power
  • Installation requires significant hull penetration and reinforcement
  • Retractable mechanism adds weight high in the stern, affecting stability calculations
  • Spare parts inventory may be larger due to specialized components
Typical Vessels: Offshore supply vesselsLNG carriersCruise shipsContainer ships (large) Bulk carriers with DP requirements
Decision Guide: Choose if: you need high thrust for stern maneuvering or dynamic positioning on a vessel where draft must be minimized when the thruster is retracted, and you value Schottel's service support. Avoid if: budget constraints favour simpler fixed thrusters, or hull space/structural limitations prevent installing a retractable unit.
Use Cases: The SPJ 2000 kW is typically installed on vessels that require precise station‑keeping during offshore operations, such as LNG carriers docking without tugs, cruise ships maneuvering in confined ports, and offshore supply vessels performing DP‑controlled transfers. Its retractable feature allows the ship to maintain optimal hydrodynamic performance when thruster power is not needed.
Datasheet
Schottel SPJ Thruster 2500kW bow unverified
· 2500.0 kW · retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
300.0
Diameter (mm)
2500
Type
azimuth
Location
bow
Strengths
  • Retractable design reduces hull resistance when not in use, improving fuel efficiency on cruise.
  • High thrust‑to‑power ratio (≈300 kN at 2500 kW) provides strong maneuverability for large vessels.
  • Full 360° azimuth steering enables precise dynamic positioning and tight berth handling.
  • Integrated hydraulic drive offers smooth, low‑noise operation with fine thrust control.
  • Compact pod footprint fits in limited bow spaces where conventional tunnel thrusters are impractical.
Weaknesses
  • Complex retractable mechanism adds maintenance tasks and requires specialised spares.
  • Higher initial capital cost compared with fixed tunnel or ducted thrusters.
  • Hull must be reinforced and a retraction well provided, consuming valuable internal volume.
  • Potential for hydraulic leaks or seal wear that can affect reliability if not monitored.
  • Maximum thrust of 300 kN may be insufficient for the very largest DP‑class vessels.
Typical Vessels: Offshore Support VesselPlatform Supply VesselAnchor Handling Tug Supply (AHTS)Cruise Ship (large)Container Ship (larger, high‑speed)
Decision Guide: Choose if you need high bow thrust with the ability to retract for reduced cruising resistance, require precise DP or tight‑berth handling, and have sufficient hull space for a retraction well. Avoid if budget is limited, vessel size exceeds the thrust capability, or maintenance resources for hydraulic systems are constrained.
Use Cases: Commonly installed on offshore support and supply vessels that operate in congested ports or need dynamic positioning for offshore installations. Also fitted on large cruise ships and container vessels where a retractable bow thruster can improve fuel efficiency while still providing strong maneuvering power during docking and undocking operations.
Datasheet
Schottel SPJ Thruster 2500kW stern unverified
· 2500.0 kW · retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
300.0
Diameter (mm)
2500
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈300 kN @ 2500 kW) for strong manoeuvring capability
  • Retractable design reduces hull resistance when the thruster is not in use, improving fuel efficiency
  • Variable‑pitch propeller gives fine speed and direction control, ideal for DP operations
  • Compact installation footprint compared with fixed tunnel thrusters of similar power
  • Proven Schottel hydraulic drive offers reliable performance and easy integration with existing ship systems
Weaknesses
  • Complex hydraulic system increases maintenance workload and requires specialised spares
  • Higher capital cost than conventional fixed‑pitch tunnel thrusters
  • Retractable mechanism occupies valuable hull volume and must be accommodated in structural design
  • Seal and bearing wear can become critical if the unit is frequently cycled between extended and retracted positions
  • Limited to vessels that can accommodate the required shaft line length and retraction space
Typical Vessels: Platform Supply Vessel (PSV)Anchor Handling Tug Supply (AHTS)Offshore Support Vessel with DP2/DP3 capabilityMid‑size product tankerContainer feeder or small bulk carrier requiring stern thrust
Certifications: DNV
Decision Guide: Choose if you need high thrust for DP or tight‑berth manoeuvring and want the fuel‑saving benefit of a retractable unit. Avoid if budget is limited, vessel design cannot accommodate the retraction housing, or a simpler fixed thruster meets your performance needs.
Use Cases: Commonly installed on offshore supply vessels for dynamic positioning while offloading rigs, on AHTS ships for precise anchor handling, and on mid‑size tankers or container feeders to aid stern‑first docking in congested ports where extra thrust and reduced drag are valuable.
Datasheet
Schottel SPJ Thruster 3000kW bow unverified
· 3000.0 kW · retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
360.0
Diameter (mm)
2900
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈360 kN at 3000 kW) for excellent maneuverability
  • Retractable design reduces drag and fuel consumption during transit
  • Full 360° steering eliminates the need for separate rudders or bow thruster tunnels
  • Integrated ducted propeller offers good cavitation resistance and low vibration
  • Proven in DP‑class offshore support vessels and cruise ships
Weaknesses
  • Complex installation requiring a dedicated hull recess and sealing system
  • Higher initial cost and lifecycle maintenance compared with fixed tunnel thrusters
  • Limited to vessels that can accommodate the retraction mechanism and space requirements
  • Potential wear of retractable seals and hydraulic actuation components
  • Spare‑part inventory more specialised than for conventional thrusters
Typical Vessels: Offshore Support Vessel (OSV)Drillship / Jack‑upLNG carrier (bow‑thruster version)Cruise shipFerry with high maneuverability needs
Certifications: DNV GL Type ApprovalABS Classification
Decision Guide: Choose if the vessel requires strong bow thrust for DP or tight‑port manoeuvring and can benefit from reduced resistance during cruise by retracting the unit. Avoid if budget constraints, limited hull space, or a simpler fixed tunnel thruster would meet performance needs.
Use Cases: The SPJ is typically installed on offshore vessels that need dynamic positioning while operating near rigs, as well as on large passenger ships that require precise docking and want to minimise drag during open‑water travel. It is also used on high‑speed ferries where rapid turning and quick retraction are valuable.
Datasheet
Schottel SPJ Thruster 3000kW stern unverified
· 3000.0 kW · retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
360.0
Diameter (mm)
2900
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈360 kN at 3000 kW) for strong maneuvering and DP capability
  • Retractable design reduces hydrodynamic resistance, improving fuel efficiency during transit
  • Full 360° rotation gives excellent handling in confined ports and offshore operations
  • Modular installation allows retro‑fit on existing hulls with relatively short downtime
  • Proven Schottel hydraulic/power transmission system known for reliability in harsh environments
Weaknesses
  • Complex hydraulic and control systems increase initial cost and maintenance requirements
  • Retractable mechanism occupies valuable internal volume and adds structural considerations
  • Higher upfront investment compared with fixed propeller or conventional tunnel thrusters
  • Partial‑load efficiency can be lower than a dedicated low‑speed propeller for continuous thrust
  • Requires regular inspection of seals and retraction bearings to avoid water ingress
Typical Vessels: Offshore Support Vessel (OSV)Anchor Handling Tug Supply (AHTS)Dynamic Positioning vessel (DP2/DP3)Cruise shipLarge container or bulk carrier with enhanced maneuverability needs
Certifications: IMO Type Approval for Azimuth ThrustersDNV GL class notationABS approval
Decision Guide: Choose if: you need high thrust for DP or tight‑berth manoeuvring, want drag reduction during cruising, and can accommodate the space and cost of a retractable system. Avoid if: budget constraints are primary, vessel operates mainly at constant low speed where a fixed tunnel thruster is more economical, or hull design cannot support the retraction housing.
Use Cases: The SPJ 3000 kW is typically installed on offshore vessels that require precise station‑keeping for drilling, ROV work, or subsea construction, as well as on large passenger ships that benefit from reduced drag while cruising and need strong bow‑/stern‑side thrust for port entry. It is also favored on DP‑equipped supply ships where rapid directional changes are essential.
Datasheet

Wärtsilä

25
Steerprop Thruster 200kW bow
· 200.0 kW · Retractable azimuth thruster
Power (kW)
200
Thrust (kN)
26.0
Diameter (mm)
540
Type
retractable
Location
bow
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Full 360° steering gives excellent maneuverability in confined ports.
  • In‑water serviceable Sternguard IWSS seal eliminates the need for dry‑dock removal during maintenance.
  • Compact retractable design reduces hull resistance when retracted, beneficial for vessels with limited draft.
  • High thrust‑to‑power ratio (26 kN @ 200 kW) compared with many fixed tunnel thrusters.
  • Integrated hydraulic drive with fine filtration extends bearing life.
Weaknesses
  • Limited power rating; not suitable for large vessels requiring >300 kW bow thrust.
  • Retractable mechanism adds mechanical complexity and higher initial cost versus fixed tunnel units.
  • Maintenance intervals (5‑year inspection, 10‑year overhaul) can be more demanding due to moving parts.
  • Potential slight efficiency loss at extreme azimuth angles because of gear geometry.
  • Requires dedicated hydraulic power unit and control system integration.
Typical Vessels: Offshore supply vesselCruise shipFerryContainer feederSmall tankerBulk carrier (≤30 kt)LNG/LPG carrier (mid‑size)
Certifications: DNVABSLR
Decision Guide: Choose if: the vessel operates in shallow waters or needs a retractable bow thruster to minimise hull resistance, requires high maneuverability for DP or tight port manoeuvring, and values underwater‑serviceable seals. Avoid if: the ship’s required bow thrust exceeds ~300 kW, budget constraints favour simpler fixed tunnel thrusters, or the vessel has sufficient draft to accommodate a permanent tunnel unit.
Use Cases: Commonly installed on offshore support ships for dynamic positioning during subsea operations, cruise liners for precise docking in congested harbours, and ferries that need rapid turn‑around in shallow terminals. The retractable feature also suits vessels that alternate between deep‑water voyages (retracted to reduce drag) and port manoeuvring (deployed).
Manufacturer Datasheet
Datasheet
Steerprop Thruster 200kW stern
· 200.0 kW · Retractable azimuth thruster with Sternguard In‑Water Serviceable Seal (IWSS)
Power (kW)
200
Thrust (kN)
26.0
Diameter (mm)
540
Type
retractable
Location
stern
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Full 360° steering gives excellent low‑speed manoeuvrability and DP support
  • Retractable design reduces drag when the thruster is not in use, improving fuel efficiency
  • Underwater serviceable seal allows maintenance without dry‑docking, lowering life‑cycle cost
  • Integrated hydraulic system with fine filtration extends bearing and gear life
  • Compact diameter (540 mm) fits vessels with limited hull space
Weaknesses
  • Relatively low power (200 kW) limits use to small‑to‑medium vessels
  • Retractable mechanism adds mechanical complexity and potential failure points
  • Higher initial purchase price compared with fixed tunnel thrusters of similar thrust
  • Spare‑part logistics are less common than for larger Wärtsilä models
  • Installation requires precise hull integration and may increase construction time
Typical Vessels: Offshore supply vesselWorkboat / tug‑assist boatCoastal ferrySmall product tanker (≤30 000 DWT)Research or survey vessel
Certifications: DNV GL class notation for retractable azimuth thrusters
Decision Guide: Choose if the vessel needs high manoeuvrability in confined ports, benefits from reduced drag when the thruster is stowed, and operates within the 200 kW power envelope. Avoid if the ship requires higher thrust/power (>500 kW), prefers a simpler fixed tunnel thruster, or has severe space constraints that preclude a retractable unit.
Use Cases: Commonly installed on offshore supply ships for dynamic positioning during offshore operations, on coastal ferries and small tankers to aid docking in tight berths, and on research vessels where precise low‑speed handling is required while maintaining hull efficiency when the thruster is retracted.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 300kW bow
· 300.0 kW · Retractable azimuth thruster
Power (kW)
300
Thrust (kN)
39.0
Diameter (mm)
610
Type
retractable
Location
bow
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈39 kN at 300 kW) for a compact unit
  • 360° continuous steering enables excellent maneuverability and DP support
  • Sternguard In‑Water Serviceable Seal (IWSS) allows underwater maintenance without dry‑docking
  • Compact 610 mm propeller diameter fits vessels with limited hull space
  • Integrated hydraulic system with fine filtration extends bearing life
Weaknesses
  • Limited maximum power (300 kW) may be insufficient for large vessels or high‑thrust requirements
  • Retractable mechanism adds mechanical complexity and potential wear points
  • Maintenance intervals (5‑year inspection, 10‑year overhaul) still require planned dry‑dock time
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power
  • Hydraulic system requires careful oil quality monitoring to avoid contamination
Typical Vessels: Offshore supply vesselsCoastal tankers (up to ~30 k DWT)Ferries and passenger tendersSmall container shipsRo‑Ro and general cargo vessels
Certifications: DNV GLABS
Decision Guide: Choose if you need a high‑maneuverability bow thruster on a vessel with limited hull space, require underwater serviceability to reduce dry‑dock time, or operate in DP‑supported offshore environments. Avoid if the ship demands higher thrust than 39 kN, prefers a simpler fixed tunnel design, or has constraints on hydraulic system complexity and maintenance resources.
Use Cases: Commonly installed on the bow of offshore support ships for dynamic positioning, on ferries for rapid docking, and on coastal tankers to aid in port entry where space is at a premium. The retractable feature also benefits vessels that cruise long distances and wish to reduce drag by stowing the thruster when not needed.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 300kW stern
· 300.0 kW · Retractable azimuth thruster
Power (kW)
300
Thrust (kN)
39.0
Diameter (mm)
610
Type
retractable
Location
stern
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • Compact 610 mm diameter allows installation on vessels with limited hull space
  • Retractable design reduces hydrodynamic resistance when the thruster is not in use
  • Sternguard In‑Water Serviceable Seal (IWSS) enables underwater maintenance, cutting downtime
  • Integrated hydraulic drive with fine filtration extends bearing life and simplifies installation
  • Full 360° steering gives excellent maneuverability for tight port operations
Weaknesses
  • Maximum power of 300 kW limits thrust to ~39 kN – insufficient for large vessels or high‑DP requirements
  • Retractable mechanism adds mechanical complexity and a potential failure point compared with fixed thrusters
  • Maintenance intervals (5‑year inspection, 10‑year overhaul) still required; overhauls are costly
  • Higher initial cost than basic tunnel thrusters of similar power
  • Requires dedicated hydraulic power unit and space for control electronics
Typical Vessels: Offshore supply vesselFeeder container shipSmall product tanker (<30 k DWT)Ro‑Ro ferryWorkboat / tug‑assist craftCruise‑ship tender
Certifications: DNV GL approvalABS classificationLR (Lloyd’s Register) type approval
Decision Guide: Choose if: you need a moderate‑power stern thruster on a vessel where hull drag must be minimised and underwater maintenance capability is valuable; space constraints favour a retractable unit; the required thrust does not exceed ~40 kN. Avoid if: the ship requires high thrust (>50 kN) or higher power for DP‑class operations, or you prefer a simpler fixed thruster with lower upfront cost.
Use Cases: Typically installed on medium‑size offshore support ships and feeder vessels that operate in congested ports or need occasional dynamic positioning. The unit is retracted during transit to improve fuel efficiency and deployed for berthing, unberthing, and low‑speed manoeuvring in tight waterways.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 500kW bow
· 500.0 kW · Retractable azimuth thruster
Power (kW)
500
Thrust (kN)
65.0
Diameter (mm)
750
Type
retractable
Location
bow
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (65 kN at 500 kW)
  • Fully retractable – reduces hydrodynamic resistance during transit
  • 360° continuous steering for superior manoeuvrability and DP capability
  • Sternguard In‑Water Serviceable Seal (IWSS) allows underwater maintenance without dry‑dock
  • Integrated hydraulic drive with fine filtration extends bearing life
Weaknesses
  • Higher capital cost compared with fixed tunnel thrusters
  • Requires hull penetration and retraction mechanism – limited to vessels that can accommodate the space
  • Maintenance of retractable gear and seals is more complex than for fixed units
  • Power rating (500 kW) may be insufficient for large tankers or cruise ships needing higher bow‑thruster thrust
  • Specialised spare parts (IWSS, blade‑root seals) can increase inventory costs
Typical Vessels: Offshore supply vesselsDynamic positioning vessels (DP2/DP3)Medium‑size container shipsBulk carriers up to ~30 000 dwtPassenger ferries and cruise ship tenders
Certifications: DNVABSLR
Decision Guide: Choose if you need high manoeuvrability, DP capability or want to eliminate thruster drag during cruising – especially on vessels that can accommodate the retraction system. Avoid if budget is tight, hull space does not allow a retractable unit, or thrust requirements exceed the 500 kW/65 kN rating.
Use Cases: Port entry and exit in confined harbours, dynamic positioning for offshore support operations, low‑speed manoeuvring of medium‑size vessels, emergency thrust reversal while underway, and any situation where drag reduction during open‑water transit is valuable.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 500kW stern
· 500.0 kW · Retractable azimuth thruster
Power (kW)
500
Thrust (kN)
65.0
Diameter (mm)
750
Type
retractable
Location
stern
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈65 kN at 500 kW) for precise maneuvering
  • Retractable design eliminates hydrodynamic resistance during transit
  • Sternguard In‑Water Serviceable Seal (IWSS) allows underwater maintenance without dry‑docking
  • Integrated hydraulic system with fine filtration extends bearing life and reduces oil contamination risk
  • Full 360° continuous steering for dynamic positioning and tight‑berth handling
Weaknesses
  • Limited to 500 kW; not suitable for very large vessels requiring higher thrust
  • Retractable mechanism adds mechanical complexity and potential failure points
  • Maintenance intervals (5‑year inspection, 10‑year overhaul) are relatively demanding
  • Higher upfront cost compared with fixed tunnel thrusters of similar power
  • Dependence on hydraulic oil system introduces contamination risk if filtration fails
Typical Vessels: Offshore supply vesselProduct tanker (≤30 kt)Ferry / Ro‑RoSmall to medium container shipCruise ship auxiliary thruster
Certifications: DNV GL class approvalABS class approval
Decision Guide: Choose if the vessel needs high maneuverability, a retractable unit to minimise drag, and the ability to perform underwater maintenance without dry‑docking. Avoid if the required thrust exceeds ~70 kN, if budget constraints favour a simpler fixed tunnel thruster, or if the operator cannot meet the prescribed inspection/overhaul schedule.
Use Cases: Commonly installed on offshore support vessels for dynamic positioning, on product tankers and ferries to aid stern‑first docking in confined ports, and on cruise ships where reduced drag during cruising is valuable while still providing precise low‑speed handling when maneuvering.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 750kW bow
· 750.0 kW · Retractable azimuth thruster
Power (kW)
750
Thrust (kN)
97.5
Diameter (mm)
925
Type
retractable
Location
bow
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (97.5 kN at 750 kW) for excellent low‑speed maneuverability
  • Full 360° steering enables precise docking and DP operations
  • Retractable design eliminates hull resistance when the thruster is stowed, improving fuel efficiency
  • Sternguard In‑Water Serviceable Seal (IWSS) allows underwater maintenance without dry‑docking
  • Integrated hydraulic system with fine filtration extends bearing life and reduces oil contamination
Weaknesses
  • Higher capital cost compared with fixed tunnel thrusters of similar power
  • Mechanical complexity of the retractable mechanism increases installation time and requires specialised training for maintenance
  • Requires sufficient hull space and structural reinforcement to accommodate retraction housing
  • Maximum thrust (≈97 kN) may be insufficient for very large vessels or high‑power DP applications
  • Periodic 5‑year inspections and 10‑year overhauls add lifecycle cost
Typical Vessels: Offshore supply vesselDynamic positioning vesselCruise ship (mid‑size)Product tankerContainer feederCoastal bulk carrier
Certifications: DNV
Decision Guide: Choose if the vessel needs high manoeuvrability, DP capability or frequent port entry where a retractable bow thruster reduces drag and improves fuel efficiency. Avoid if budget constraints dominate, the hull cannot accommodate the retraction housing, or the required thrust exceeds ~100 kN for larger vessels.
Use Cases: Commonly installed as a bow thruster on medium‑size offshore support ships and cruise vessels to provide precise docking, low‑speed maneuvering in confined ports, and supplemental thrust for dynamic positioning. The retractable feature is especially valued on vessels that spend long periods underway where drag reduction improves overall fuel consumption.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 750kW stern
· 750.0 kW · Retractable azimuth thruster
Power (kW)
750
Thrust (kN)
97.5
Diameter (mm)
925
Type
retractable
Location
stern
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (97.5 kN at 750 kW)
  • Full 360° continuous steering for precise manoeuvring
  • Retractable design reduces hull resistance during transit, improving fuel efficiency
  • Sternguard In‑Water Serviceable Seal (IWSS) allows seal maintenance without dry‑docking
  • Integrated hydraulic system with fine filtration extends bearing and gear life
Weaknesses
  • Higher capital cost compared with fixed tunnel thrusters of similar power
  • More complex retractable mechanism increases inspection and overhaul workload
  • Requires dedicated hull space and structural reinforcement for retraction tube
  • Seal wear can become critical in high‑cycle DP operations, demanding strict monitoring
  • Performance advantage diminishes at low load factors; efficiency drops below 30% rated power
Typical Vessels: Cruise shipsContainer vesselsOffshore supply vessels (OSV)LNG carriersRo‑Ro ferriesDP2/DP3 dynamic positioning vessels
Certifications: DNV
Decision Guide: Choose if the vessel needs high manoeuvring capability, DP operation and wants drag reduction during cruising – especially where hull space allows a retractable unit. Avoid if budget is tight, the ship has limited internal volume for a retraction tube, or only modest manoeuvring performance is required.
Use Cases: The thruster is typically installed on the stern of vessels that operate in congested ports or offshore sites, providing rapid lateral thrust for docking, undocking and dynamic positioning. Its retractable feature is exploited during open‑water voyages to lower resistance and fuel consumption, while the IWSS seal enables underwater servicing without dry‑docking.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 1000kW bow
· 1000.0 kW · Retractable Azimuth Thruster
Power (kW)
1000
Thrust (kN)
130.0
Diameter (mm)
1100
Type
retractable
Location
bow
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (130 kN at 1000 kW) for rapid maneuvering
  • Retractable design reduces hull resistance when the thruster is not in use
  • Sternguard IWSS allows full underwater maintenance, minimizing dry‑dock time
  • 360° continuous steering gives excellent low‑speed control and DP capability
  • Integrated fine‑filtration hydraulic system extends bearing life and lowers oil contamination risk
Weaknesses
  • Higher initial purchase and installation cost compared with fixed tunnel thrusters
  • Complex retractable mechanism requires more routine inspection and skilled maintenance
  • Hull penetration needed for retraction; not suitable for vessels with limited bow space
  • Seal wear (IWSS) can lead to oil leakage if not monitored closely
  • Power demand may be excessive for small vessels or those with limited electrical generation capacity
Typical Vessels: Container shipsTanker (product/LNG)Bulk carriersOffshore supply vesselsCruise shipsDP‑class ferries and passenger vessels
Certifications: DNVABSLloyd's RegisterIMO Type Approval
Decision Guide: Choose if you need high bow thrust for tight port manoeuvring or dynamic positioning, want drag reduction when the thruster is stowed, and can accommodate underwater maintenance. Avoid if vessel size or budget does not justify a retractable system, hull geometry cannot host the retraction unit, or simplicity/low cost of a fixed tunnel thruster is preferred.
Use Cases: The Steerprop 1000 kW bow thruster is commonly installed on medium‑to‑large vessels that require precise low‑speed handling—e.g., docking large container ships in confined harbours, maintaining position for offshore supply or LNG carriers during loading/unloading, and providing auxiliary thrust for cruise ships navigating tight berths. Its retractable feature also benefits vessels that operate long voyages where drag reduction improves fuel efficiency.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 1000kW stern
· 1000.0 kW · Retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
130.0
Diameter (mm)
1100
Type
retractable
Location
stern
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈130 kN at 1000 kW)
  • Fully retractable design reduces cruising resistance and fuel consumption
  • 360° continuous steering enables precise maneuvering and DP capability
  • Sternguard In‑Water Serviceable Seal (IWSS) allows underwater seal maintenance without dry‑docking
  • Integrated hydraulic system with fine filtration extends bearing life
Weaknesses
  • Higher capital cost compared with fixed tunnel thrusters
  • More complex hydraulic and retraction mechanisms increase maintenance skill requirements
  • Requires sufficient hull space for the retraction well, limiting retrofit options on smaller vessels
  • Seal wear (IWSS) must be inspected regularly; failure can lead to water ingress
  • Power demand may be excessive for small or low‑speed craft
Typical Vessels: Offshore support vesselDP2/DP3 dynamic positioning vesselCruise shipLarge container shipLNG carrier
Certifications: DNV
Decision Guide: Choose if the vessel needs high maneuverability, DP capability and wants to minimise drag during transit – especially on large offshore or passenger ships where hull space for a retractable unit is available. Avoid if budget constraints favour simpler fixed thrusters, the ship is small with limited hull volume, or the operating crew lacks hydraulic‑system expertise.
Use Cases: The thruster is typically deployed for precise docking in confined ports, dynamic positioning while offshore loading/unloading, emergency maneuvering, and can be retracted during open‑sea cruising to lower resistance and fuel consumption.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 1500kW bow
· 1500.0 kW · Retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
195.0
Diameter (mm)
1450
Type
retractable
Location
bow
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (195 kN at 1500 kW) for excellent manoeuvrability
  • Full 360° continuous steering enables precise DP and close‑quarter docking
  • Retractable design reduces hull resistance and fuel consumption when the thruster is not required
  • Sternguard In‑Water Serviceable Seal (IWSS) allows seal maintenance without dry‑docking
  • Integrated hydraulic system with fine filtration extends bearing life and lowers oil‑change intervals
Weaknesses
  • Higher capital cost compared with fixed tunnel or tunnel‑type thrusters
  • More complex installation and retraction mechanism increases installation time and requires specialised crew training
  • Seal and shaft‑seal wear must be inspected at 5‑year intervals; failure can lead to costly underwater repairs
  • Requires sufficient hull space for the 1.45 m diameter housing and retraction well
  • Potential for mechanical failure of the retractable drive unit if not maintained according to schedule
Typical Vessels: Offshore supply vessel (OSV)Anchor handling tug supply (AHTS) shipDynamic positioning (DP2/DP3) container or bulk carrierCruise ferryLNG carrier with high‑speed manoeuvring requirements
Certifications: DNV GL class approvalABS class approvalLR class approvalIMO Type Approval for thrusters (IMO D‑2)
Decision Guide: Choose if you need high thrust and precise 360° steering while keeping hull resistance low – e.g., vessels with DP requirements, limited aft space, or frequent port manoeuvring. Avoid if budget constraints favour simpler fixed tunnel thrusters, the vessel cannot accommodate the retractable housing, or maintenance resources for seal inspections are limited.
Use Cases: The Steerprop 1500 kW is typically installed on offshore support ships and DP‑equipped cargo vessels that require rapid heading changes, tight berth handling, or emergency manoeuvring. Its retractable feature is valuable for long transits where drag reduction improves fuel efficiency, while still providing full thrust when docking or during dynamic positioning operations.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 1500kW stern
· 1500.0 kW · Retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
195.0
Diameter (mm)
1450
Type
retractable
Location
stern
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (195 kN at 1500 kW) for strong low‑speed manoeuvring
  • Retractable design reduces hull resistance and fuel consumption when the thruster is not needed
  • 360° continuous steering enables dynamic positioning and tight docking operations
  • Sternguard In‑Water Serviceable Seal (IWSS) allows underwater maintenance without dry‑docking
  • Integrated hydraulic drive with fine filtration extends bearing life and lowers oil contamination risk
Weaknesses
  • Higher capital cost compared with fixed tunnel or bow thrusters of similar power
  • Complex retractable mechanism adds moving parts that require specialised inspection tools
  • Maintenance intervals (5‑year inspections, 10‑year overhauls) can be costly and need trained personnel
  • Limited maximum retraction depth; not suitable for vessels with very deep drafts or limited hull thickness
  • Maximum thrust is lower than larger‑diameter thrusters, which may limit bollard pull on heavy‑duty tugs
Typical Vessels: Offshore supply vessel (DP2/DP3)TugboatCruise shipContainer ship (for stern maneuvering)LNG carrier (maneuvering assistance)
Certifications: DNV GL class approvalABS class approvalIMO Type Approval for thrusters
Decision Guide: Choose if the vessel needs high manoeuvrability, DP capability or frequent docking where a retractable unit saves fuel and reduces drag. Avoid if budget constraints dominate, the ship operates primarily at cruise speed with little low‑speed maneuvering, or if hull geometry prevents safe retraction.
Use Cases: Commonly installed on offshore support vessels for station‑keeping, tugs requiring rapid directional changes, cruise ships needing precise berth alignment, and large container or LNG carriers that use a stern thruster to assist in port entry and exit while keeping drag low during open‑water sailing.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 2000kW bow
· 2000.0 kW · Retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
260.0
Diameter (mm)
1800
Type
retractable
Location
bow
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (260 kN at 2000 kW) for rapid maneuvering
  • Retractable design eliminates hull resistance during transit, saving fuel
  • 360° continuous steering enables precise dynamic positioning and docking
  • Sternguard In‑Water Serviceable Seal allows underwater maintenance without dry‑docking
  • Integrated hydraulic system with fine filtration extends bearing life
Weaknesses
  • Complex retractable mechanism raises initial capital cost and installation time
  • Requires regular 5‑year inspections and 10‑year overhauls, increasing lifecycle maintenance effort
  • Large 1.8 m diameter tunnel limits applicability to vessels with sufficient hull space
  • Oil‑based hydraulic system demands strict oil quality monitoring to avoid water contamination
  • Critical shaft and blade‑root seals may need replacement at major overhauls
Typical Vessels: Large tankersLNG carriersCruise shipsOffshore supply vesselsContainer shipsBulk carriers with DP or tight‑port requirements
Certifications: DNV GLABS
Decision Guide: Choose if you need high thrust for dynamic positioning, want drag reduction during cruising, and have the hull space for a retractable unit. Avoid if budget is limited, vessel size restricts a 1.8 m tunnel, or maintenance facilities cannot support the scheduled overhauls.
Use Cases: Commonly installed as a bow thruster on LNG carriers for DP‑2 operations, on large container ships to aid port entry, on cruise liners for tight‑harbor maneuvering, and on offshore supply vessels for station‑keeping while offloading cargo.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 2000kW stern
· 2000.0 kW · Retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
260.0
Diameter (mm)
1800
Type
retractable
Location
stern
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (260 kN at 2000 kW)
  • Retractable design reduces hull resistance when the thruster is not in use
  • Sternguard In‑Water Serviceable Seal (IWSS) allows seal replacement without dry‑docking
  • Continuous 360° steering provides excellent maneuverability and DP capability
  • Integrated hydraulic system with fine filtration extends bearing life
Weaknesses
  • Higher capital cost than comparable fixed tunnel thrusters
  • Complex installation requiring a large hull opening and retractable mechanism
  • Maintenance intervals (5‑year inspection, 10‑year overhaul) can be costly; seal wear is critical
  • Requires sufficient space for the 1.8 m propeller diameter and associated gear train
  • Hydraulic oil contamination risk; water ingress must be continuously monitored
Typical Vessels: Container shipBulk carrierTankerOffshore supply vessel (OSV)Cruise ship
Certifications: DNVABS
Decision Guide: Choose if the vessel needs high‑power DP or tight‑berth maneuvering and can benefit from reduced drag when the thruster is retracted. Avoid if budget constraints prohibit a higher upfront cost, the hull cannot accommodate the retractable unit, or the operational profile does not require a stern azimuth thruster.
Use Cases: Commonly installed on large merchant ships and offshore support vessels for dynamic positioning, low‑speed maneuvering in confined ports, and emergency thrust generation. The underwater serviceable seal makes it attractive for operators seeking to minimise dry‑dock time.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 2500kW bow
· 2500.0 kW · Retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
325.0
Diameter (mm)
2150
Type
retractable
Location
bow
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈130 kN/MW) for excellent low‑speed manoeuvring
  • Full 360° continuous steering without dead zones
  • Retractable design eliminates hull resistance during transit, improving fuel efficiency
  • Sternguard In‑Water Serviceable Seal enables underwater maintenance without dry‑docking
  • Integrated hydraulic system with fine filtration extends bearing and gear life
Weaknesses
  • Complex mechanical and hydraulic arrangement raises initial purchase price and requires specialised spare parts
  • Regular oil analysis and seal inspections are mandatory to avoid water ingress
  • Retractable mechanism adds moving parts that can wear, increasing long‑term maintenance effort
  • Maximum thrust is lower than a fixed tunnel thruster of the same power rating
  • Installation space at the bow must accommodate retraction housing, limiting fit on very narrow hulls
Typical Vessels: Offshore Supply VesselDynamic Positioning vessel (DP2/DP3)Cruise shipContainer ship (large‑size)LNG carrierResearch / Survey vessel
Certifications: DNV GLABS
Decision Guide: Choose if the vessel requires high manoeuvrability or dynamic positioning and you want to minimise hull resistance when the thruster is not in use. Avoid if budget constraints dominate, the ship operates only in calm ports where a fixed tunnel thruster would suffice, or space for the retraction housing is unavailable.
Use Cases: Commonly installed on offshore support vessels that need precise station‑keeping during drilling operations, cruise liners entering tight berths, LNG carriers requiring both strong bow thrust and reduced drag on long voyages, and research ships operating in ice or shallow waters where a retractable unit protects the propeller from impact while cruising.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 2500kW stern
· 2500.0 kW · retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
325.0
Diameter (mm)
2150
Type
retractable
Location
stern
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈130 kN per MW) for excellent low‑speed maneuverability
  • Retractable design eliminates drag during cruising, improving fuel efficiency
  • Sternguard In‑Water Serviceable Seal (IWSS) allows underwater maintenance without dry‑docking
  • Integrated hydraulic system with fine filtration extends bearing and gear life
  • Full 360° continuous steering enables precise dynamic positioning
Weaknesses
  • Complex retractable mechanism adds installation cost and requires regular inspection
  • Higher initial capital outlay compared with fixed tunnel thrusters of similar power
  • Requires dedicated space within the hull for the retraction tunnel, limiting applicability on narrow‑beam vessels
  • Maintenance intervals (5‑year inspections, 10‑year overhauls) can be more demanding than simple tunnel units
Typical Vessels: Offshore Supply Vessel (OSV)Platform Supply Vessel (PSV)Anchor Handling Tug Supply (AHTS)DP‑class Container ShipCruise FerryLNG Carrier with DP requirements
Decision Guide: Choose if: you need high maneuverability and DP capability, want to minimise cruising resistance, and have hull space for a retractable tunnel. Avoid if: budget constraints dominate, vessel design cannot accommodate the retraction system, or simplicity/low maintenance is a higher priority than performance.
Use Cases: The thruster is typically installed on vessels that perform frequent low‑speed operations such as offshore platform transfers, dynamic positioning during drilling support, tight‑berth manoeuvring in congested ports, and cruise ship docking where rapid thrust direction changes are required while still benefiting from reduced drag during open‑sea transit.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 3000kW bow
· 3000.0 kW · Retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
390.0
Diameter (mm)
2500
Type
retractable
Location
bow
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈130 kN per MW) for excellent low‑speed manoeuvrability
  • Retractable design reduces hydrodynamic resistance during transit, saving fuel
  • 360° continuous steering enables precise positioning and DP operations
  • Sternguard In‑Water Serviceable Seal (IWSS) allows underwater maintenance without dry‑docking
  • Integrated hydraulic system with fine filtration extends bearing life and lowers oil contamination risk
Weaknesses
  • Higher capital cost compared with fixed tunnel thrusters of similar power
  • Complex retraction mechanism adds potential failure points and requires regular inspection
  • Large installation envelope (≈2.5 m diameter) limits use on vessels with restricted hull space
  • Maintenance intervals (5‑year inspections, 10‑year overhauls) can be more demanding than simpler thrusters
  • Requires dedicated hydraulic power unit and control electronics, increasing system integration effort
Typical Vessels: Offshore supply vesselsCruise shipsLarge container ships (≥8 000 TEU)LNG carriersDP‑class tugs
Decision Guide: Choose if the vessel needs high manoeuvrability, DP capability, or wants to minimise drag during cruising and can accommodate a retractable unit. Avoid if budget is tight, hull space for retraction is limited, or the operational profile does not demand the extra thrust and steering flexibility.
Use Cases: Commonly installed on large ocean‑going vessels that require precise port entry/exit, dynamic positioning for offshore operations, or emergency manoeuvring in confined waters. The retractable feature is especially valued on ships that spend long periods at sea where drag reduction translates into fuel savings.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 3000kW stern
· 3000.0 kW · Retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
390.0
Diameter (mm)
2500
Type
retractable
Location
stern
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust (390 kN) for a 3000 kW unit gives excellent maneuverability and DP capability
  • Retractable design eliminates drag when the thruster is stowed, saving fuel at cruising speed
  • Sternguard In‑Water Serviceable Seal allows seal replacement or inspection without dry‑docking
  • Integrated fine‑filtration hydraulic system prolongs bearing life and reduces oil contamination risk
  • 360° continuous steering enables precise lateral and rotational control
Weaknesses
  • Higher capital cost compared with fixed tunnel thrusters of similar power
  • Mechanical complexity of the retractable mechanism increases maintenance workload
  • Requires a large (≈2.5 m) tunnel aperture, limiting installation on vessels with restricted hull space
  • Seal and bearing wear must be monitored closely; failure can lead to costly unscheduled repairs
  • Power demand is significant; auxiliary power system must accommodate peak loads
Typical Vessels: Offshore supply vesselDynamic positioning (DP) vesselCruise shipContainer ship (large‑size)Tanker (LR2/LR3)
Certifications: DNVABSIMO Type Approval
Decision Guide: Choose if you need high thrust for tight port manoeuvring or DP, want drag‑free operation when the thruster is not in use, and can accommodate a 2.5 m tunnel. Avoid if budget constraints dominate, hull space is limited, or you prefer a simpler fixed‑type thruster with lower maintenance complexity.
Use Cases: Commonly installed on offshore support vessels for station‑keeping, large cruise ships to aid berthing in confined ports, and container or tanker ships that require stern thrust for safe maneuvering under low‑speed conditions. The retractable feature is especially valuable on vessels that operate both at high speed (where drag matters) and low speed (requiring precise control).
Manufacturer Datasheet
Datasheet
Steerprop Thruster 3500kW bow
· 3500.0 kW · Retractable azimuth thruster
Power (kW)
3500
Thrust (kN)
455.0
Diameter (mm)
2850
Type
retractable
Location
bow
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (455 kN at 3500 kW) for excellent low‑speed maneuverability
  • Fully retractable design reduces hydrodynamic resistance during transit, saving fuel
  • 360° continuous steering enables precise docking and dynamic positioning
  • Sternguard In‑Water Serviceable Seal (IWSS) allows underwater maintenance without dry‑docking
  • Integrated hydraulic system with fine filtration extends bearing life and lowers oil contamination risk
Weaknesses
  • Higher capital cost compared with fixed bow thrusters of similar power
  • Complex retraction mechanism requires specialised installation and crew training
  • Maintenance intervals (5‑year inspection, 10‑year overhaul) are more demanding due to moving parts
  • Hull penetration for the retractable unit can affect structural integrity if not properly reinforced
  • Large diameter (2.85 m) may limit applicability on vessels with restricted bow space
Typical Vessels: Cruise shipsLNG carriersOffshore supply vessels (DP‑class)Ferries and Ro‑Ro vesselsLarge container ships requiring enhanced maneuverability
Certifications: DNVABSIMO Type Approval
Decision Guide: Choose if the vessel needs high manoeuvring performance, benefits from drag reduction during cruising, or operates in tight ports/Dynamic Positioning scenarios. Avoid if budget constraints dominate, the ship size cannot accommodate the retraction mechanism, or a simpler fixed thruster meets operational requirements.
Use Cases: The Steerprop 3500 kW is typically installed on large passenger and offshore vessels to provide precise docking assistance, low‑speed thrust for DP operations, and to minimise fuel consumption by retracting when sailing in open water. It is also favoured on ships with limited draft where a protruding fixed thruster would increase resistance.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 3500kW stern
· 3500.0 kW · Retractable azimuth thruster with Sternguard IWSS seal
Power (kW)
3500
Thrust (kN)
455.0
Diameter (mm)
2850
Type
retractable
Location
stern
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈455 kN at 3500 kW) for strong maneuvering and DP capability
  • Retractable design reduces hull resistance during normal cruising, saving fuel
  • Sternguard In‑Water Serviceable Seal allows seal replacement without dry‑docking
  • 360° continuous steering with optional 8° propeller tilt for up to 20 % extra thrust
  • Integrated hydraulic drive with fine filtration extends bearing life
Weaknesses
  • Complex retractable mechanism increases initial cost and installation time
  • Requires a large duct (≈2.85 m diameter) and internal retraction space, limiting hull compatibility
  • Seal and shaft‑seal wear demand specialised underwater maintenance procedures
  • Higher spare‑part inventory compared with fixed tunnel thrusters
  • Longer lead times for OEM delivery relative to conventional tunnel units
Typical Vessels: Offshore Supply Vessels (OSV)Dynamic Positioning (DP) vesselsCruise ships and large ferriesLNG carriers with stern‑maneuvering needsFPSO support vessels
Certifications: DNV GL class approvalABS classificationLR (Lloyd's Register) approval
Decision Guide: Choose if you need high thrust for DP or tight‑berth manoeuvring, want drag reduction during transit, and can accommodate the retraction space. Avoid if budget is limited, hull geometry cannot house a 2.85 m duct, or you prefer a simpler fixed tunnel thruster with lower upfront cost.
Use Cases: The 3500 kW Steerprop is typically installed on offshore support ships that must hold position beside rigs, on large cruise vessels needing precise stern thrust for docking, and on LNG carriers where a retractable unit provides both maneuvering power and reduced resistance when sailing. It also serves as an emergency backup propulsion source on DP‑class vessels.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 4000kW bow
· 4000.0 kW · Retractable azimuth thruster
Power (kW)
4000
Thrust (kN)
520.0
Diameter (mm)
3200
Type
retractable
Location
bow
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High power‑to‑thrust ratio (4000 kW / 520 kN) suitable for DP2/DP3 vessels
  • Retractable design reduces hull resistance when the thruster is not in use
  • Sternguard In‑Water Serviceable Seal allows underwater maintenance without dry‑docking
  • Continuous 360° steering gives superior maneuverability in confined ports
  • Integrated hydraulic system with fine filtration extends bearing life
Weaknesses
  • Complex hydraulic and seal systems increase initial cost and require specialized training
  • Regular oil quality monitoring is mandatory; water contamination >1000 ppm triggers maintenance
  • Large propeller diameter (3.2 m) limits installation to vessels with sufficient hull space
  • Erosion‑prone blades demand frequent visual/NDT inspections in abrasive environments
  • Maintenance intervals (5‑year inspection, 10‑year overhaul) can be costly for operators
Typical Vessels: Offshore Supply VesselLNG CarrierCruise ShipLarge Container ShipVery Large Crude Carrier (VLCC) with DP requirements
Certifications: DNV GL Class ApprovedABS Approved
Decision Guide: Choose if the vessel requires high thrust bow maneuverability, dynamic positioning or frequent port calls where retractable thrusters reduce drag and underwater serviceability cuts dry‑docking time. Avoid if budget constraints favor a fixed thruster, the hull cannot accommodate the 3.2 m diameter, or operating conditions involve heavy debris that could damage a retractable unit.
Use Cases: Commonly installed on DP‑capable offshore support ships for station‑keeping, LNG carriers for precise berth alignment, cruise liners navigating tight harbours, and large container vessels needing extra bow thrust during low‑speed maneuvers.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 4000kW stern
· 4000.0 kW · Retractable azimuth thruster
Power (kW)
4000
Thrust (kN)
520.0
Diameter (mm)
3200
Type
retractable
Location
stern
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈130 kN/MW) for a single unit
  • Fully retractable design cuts drag during cruising and protects the propeller in ice or debris
  • Sternguard In‑Water Serviceable Seal (IWSS) allows underwater maintenance without dry‑dock
  • 360° continuous steering gives excellent maneuverability and DP capability
  • Integrated hydraulic drive with fine filtration extends bearing life and reduces oil contamination
Weaknesses
  • Higher capital cost than fixed tunnel or bow thrusters of similar power
  • Mechanical retraction system adds complexity and potential failure points
  • Requires dedicated hull space for the retraction well, limiting installation on smaller ships
  • Maintenance intervals (5‑year inspection, 10‑year overhaul) are more demanding than simple tunnel thrusters
  • Maximum thrust limited to ~520 kN; larger vessels may need multiple units
Typical Vessels: Cruise shipLNG carrierOffshore supply vesselFPSO / drillshipLarge tanker or bulk carrier with DP requirements
Certifications: DNV GLABSLR
Decision Guide: Choose if the vessel needs high thrust for dynamic positioning, tight‑port maneuvering, and wants drag reduction by retracting the thruster when underway. Avoid if budget is limited, hull space cannot accommodate a retraction well, or a simpler fixed tunnel thruster meets the manoeuvring requirements.
Use Cases: Commonly installed on DP‑class offshore vessels for station‑keeping, on cruise ships to aid docking and reduce fuel consumption at sea, and on LNG carriers where ice protection and low resistance are critical. Also used as an emergency backup propulsion unit on large tankers.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 5000kW bow
· 5000.0 kW · Retractable azimuth thruster
Power (kW)
5000
Thrust (kN)
650.0
Diameter (mm)
3900
Type
retractable
Location
bow
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (650 kN at 5 MW) for rapid bow‑side manoeuvres
  • Retractable design reduces drag and fuel consumption when the thruster is not in use
  • Sternguard In‑Water Serviceable Seal (IWSS) allows maintenance without dry‑docking
  • 360° continuous steering gives excellent handling for DP or tight berths
  • Integrated hydraulic system with fine filtration extends bearing life
Weaknesses
  • Large physical envelope (3.9 m diameter) limits installation on smaller hulls
  • Complex retractable mechanism adds initial cost and requires specialised maintenance expertise
  • High power demand necessitates robust electrical/hydraulic supply infrastructure
  • Weight and centre‑of‑gravity impact must be carefully assessed during ship design
Typical Vessels: Crude oil tankerLNG carrierContainer vessel (≥8 000 TEU)Bulk carrierOffshore supply vesselCruise ship
Certifications: DNVABS
Decision Guide: Choose if the vessel needs high bow thrust for DP or tight‑berth handling, operates in shallow water where drag reduction is valuable, and can accommodate a retractable unit. Avoid if hull space is limited, budget constraints preclude the higher upfront cost, or the operational profile does not require frequent use of a bow thruster.
Use Cases: Commonly installed on large tankers, LNG carriers and offshore support ships for dynamic positioning, ice‑class manoeuvring, and rapid port entry/exit in congested terminals. The retractable feature is especially beneficial for vessels that spend long periods cruising at speed, as it eliminates unnecessary resistance.
Manufacturer Datasheet
Datasheet
Steerprop Thruster 5000kW stern
· 5000.0 kW · Retractable azimuth thruster
Power (kW)
5000
Thrust (kN)
650.0
Diameter (mm)
3900
Type
retractable
Location
stern
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Strengths
  • High thrust‑to‑power ratio (≈130 kN/MW) suitable for DP and tight‑port maneuvers
  • 360° continuous steering eliminates need for separate bow thrusters in many cases
  • Retractable design reduces hull drag when the unit is stowed, improving fuel efficiency
  • Sternguard IWSS allows seal inspection/replacement under water, minimizing dry‑dock time
  • Integrated hydraulic system with fine filtration extends bearing and gear life
Weaknesses
  • Large tunnel diameter (≈3.9 m) limits installation to vessels with sufficient hull space
  • Higher capital cost compared with fixed tunnel thrusters or electric azimuth units
  • Complex retraction mechanism adds mechanical failure points and requires specialised training
  • Hydraulic oil system demands rigorous monitoring for water contamination
  • Maintenance intervals (5‑year inspection, 10‑year overhaul) can be costly
Typical Vessels: Very Large Crude Carriers (VLCC)LNG carriersCruise shipsOffshore supply vessels (DP2/DP3)Large container shipsBulk carriers requiring high maneuverability
Certifications: DNVABSLR
Decision Guide: Choose if you need maximum thrust for dynamic positioning or confined‑port operations and want the drag‑reduction benefit of a retractable unit with underwater serviceable seals. Avoid if hull space is limited, budget constraints preclude the higher purchase price, or an all‑electric azimuth solution better matches emission‑reduction goals.
Use Cases: Installed on DP‑class offshore support vessels and large tankers to provide precise station‑keeping during offshore operations or to maneuver safely in restricted harbours without tug assistance. The retractable feature is exploited on long voyages where the thruster is stowed to minimise resistance, then deployed for docking or emergency maneuvers.
Manufacturer Datasheet
Datasheet
Wärtsilä WRT-250
WRT-250
2500 kW · 2500.0 kW · Seawater · Retractable azimuth thruster
Technical Specifications
Leistungsbereich WST
700 kW bis 4900 kW
Leistungsbereich WTT
400 kW bis 5500 kW
Leistungsbereich WST-R
750 kW bis 6500 kW
Neigungswinkel (WST-R)
8-Grad Propeller-Getriebe-Neigung für 15-20% höheren Schub
Drehbereich
360° kontinuierliche Lenkung in horizontaler Ebene
Wartungsintervalle
5-Jahres-Inspektionen, 10-Jahres-Überholungen oder nach 40.000-56.000 Betriebsstunden
Dichtungstechnologie
Sternguard In-Water Serviceable Seal (IWSS) - vollständig unter Wasser wartbar
Ölsystem
Integrierte Hydraulik mit Feinfiltration zur Lagerverlängerung
Product Lines
  • WST - Steerable Thrusters (700-4900 kW)
  • WTT - Transverse/Tunnel Thrusters (400-5500 kW)
  • WST-R - Retractable Steerable Thrusters (750-6500 kW)
  • WST-E - Electric Steerable Thrusters (WST-18E embedded electric)
  • Underwater-Mountable Steerable Thrusters
Common Failures & Inspection Points
  • Area: Propeller-Blätter: Erosion, Korrosion, Kantenschäden, Verschleißmuster
    Check: Visuelle Inspektion und NDT (Zerstörungsfreie Prüfung) gemäß OEM und Klassifikationsgesellschafts-Standards durchführen. Polieren in Kombination mit Kantenschaden-Reparatur erhöht Betriebseffizienz um 2-5%. Auf Pitting, Erosionsmuster und Korrosionsstellen prüfen; schwere Pitting-Stellen dokumentieren.
  • Area: Propeller-Blattwurzel-Dichtungen (Blade Foot Seals): Verschleiß, Undichtheit, Wassereinlass
    Check: 5-Jahres-Überholung: Demontage und Kontrolle aller Dichtungen durchführen. 10-Jahres-Überholung: Vollständiger Austausch von Blattwurzel-O-Ringen durchführen. Auf Wasser-Eindringung in Strahlruder-Assembly prüfen. Dichtungen sind kritisch für Systemschutz.
  • Area: Wellendichtungen (Shaft Seals): Abnutzung, Leckage, Austauschbedarf
    Check: Propellerwellenverschleiß mit Poker-Gauge messen (zwischen letzten zwei Heckrohr-Dichtungen). Vollständige Inspektion von Zahnspiel, Zahnmuster und Wellendichtungen durchführen. 5-Jahres-Überholung: Dichtungsersatz. 10-Jahres-Überholung: Umfangreicher Austausch.
  • Area: Lager (Roller Bearings): Verschleiß, Lagerspiel, Pressung, Versagen-Vorzeichen
    Check: 5-Jahres-Überholung: Lagerspiel und Verschleiß kontrollieren. 10-Jahres-Überholung: Vollständiger Lagerwechsel, Pressung neu einstellen, NDT-Prüfung durchführen. Grundlager-Achtspielverschleiß mit Feeler-Gauge (0,1 mm) prüfen; max. Grenzwert 2 mm. Wärtsilä-Lagerverschleißmess-System nutzen zur Fernüberwachung des Propellerschafts-Absatzes.
  • Area: Hydrauliksystem: Öl-Verschmutzung (Wasser, Partikel), Filtration, Ölqualität
    Check: Getriebeöl regelmäßig prüfen. Bei kritischen Grenzwerten: Teiltausch (Bleed-and-Feed) oder kompletter Ölwechsel. Wasser-Gehalt im Öl überwachen (kritisch >1000 ppm). Feinfiltrations-System und redundante Filter-Optionen prüfen. Wasser-Eindringung kontinuierlich ausfiltern. Alle Wärtsilä-zugelassenen Ersatzteile nutzen. 5-10-Jahres-Überholung: Ölwechsel und Filter-Wartung durchführen.
  • Area: Sternguard In-Water Serviceable Seal (IWSS): Dichtungs-Integrität, Wartung unter Wasser möglich
    Check: Öl-Leckage an der äußeren Dichtung prüfen. Inflatable Emergency Seal und innere Rope Guard kontrollieren. Vollständig unter Wasser wartbar ohne Habitatanlage oder Entladung. Dichtungs-Spaltmaße und Verschleiß messen. Retrofit-Kompatibilität mit anderen Dichtungstypen überprüfen. Kompatibilität mit EAL und Mineralölen bestätigen.

Typ-universelle Inspektions-/Wartungspunkte fuer Bow/Stern Thrusters (Wärtsilä, Mega-Schwarm 2026-06). Per-Modell-Specs nicht auto-gefuellt.

Service: Wartsila retractable; test retraction/deployment mechanism regularly.
Spare Parts: Wärtsilä: Getriebeöl und Dichtungen an Bord. Lead time: 3-6 Wochen.
Strengths
  • Full 360° steering enables precise maneuvering and DP operations
  • Retractable design reduces hull resistance, improving fuel efficiency at cruise speed
  • Sternguard In‑Water Serviceable Seal (IWSS) allows underwater maintenance without dry‑docking
  • Integrated hydraulic drive with fine filtration extends bearing life and lowers oil contamination risk
  • Wide power range (750 kW – 6.5 MW) covers many vessel classes
Weaknesses
  • Higher initial purchase and installation cost compared with fixed tunnel thrusters
  • Complex retract/extend mechanism requires regular functional testing and specialised spare parts
  • Seal wear (IWSS) can be costly to replace and demands OEM‑approved components
  • Hull form must accommodate a retractable tunnel, limiting applicability on some existing ships
  • Maintenance intervals (5‑year inspection, 10‑year overhaul) are more demanding than simple fixed units
Typical Vessels: Offshore Supply VesselDynamic Positioning vessel (DP2/DP3)Cruise shipLNG carrierContainer shipBulk carrier
Certifications: DNV GL Type ApprovalABS ClassificationIMO SOLAS compliance
Decision Guide: Choose if the vessel needs high maneuverability, dynamic positioning capability, or wants to minimise drag during transit by retracting the thruster. Avoid if budget constraints are tight, the hull cannot accommodate a retractable tunnel, or the operating environment (e.g., heavy ice) favours a fixed, robust thruster.
Use Cases: The WRT-250 is commonly installed on DP‑equipped offshore support vessels for precise station keeping, on cruise ships for fast berthing and unberthing, on LNG carriers to aid in tight port manoeuvres, and on newbuild container or bulk carriers where fuel‑saving drag reduction is a design priority.
Manufacturer Datasheet
Datasheet

Hydromaster

18
HM-RAT-200 bow unverified
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
26.0
Diameter (mm)
540
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈13 kN per 100 kW)
  • Retractable design eliminates hull resistance when the unit is stowed
  • 360° thrust vectoring gives excellent maneuverability and DP capability
  • Compact 540 mm propeller diameter fits vessels with limited beam
  • Sealed, low‑maintenance bearing arrangement
Weaknesses
  • Mechanical retraction system adds complexity and potential failure points
  • Maximum thrust (26 kN) may be insufficient for larger DP‑class ships
  • Higher upfront cost compared with fixed tunnel thrusters of similar power
  • Requires internal hull space for the retraction cradle and hydraulic/pneumatic actuators
  • Noise and vibration can be higher at full power due to exposed propeller
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS) – small/medium sizeWorkboat / Crew Transfer VesselFerry (short‑route, high maneuverability required)Small Container or Bulk Carrier (up to ~30 kt)
Decision Guide: Choose if you need full azimuth thrust for DP or tight‑harbor manoeuvring while keeping hull resistance low when the thruster is not in use. Avoid on vessels that have ample space for fixed tunnel thrusters, require higher thrust than 26 kN, or where simplicity and lowest cost are primary concerns.
Use Cases: The HM-RAT-200 is typically installed on offshore support ships that perform dynamic positioning during subsea operations, as well as on ferries and workboats that need rapid side‑way thrust for docking in congested ports. Its retractable feature is valuable on vessels where drag reduction at cruise speed improves fuel efficiency.
Datasheet
HM-RAT-200 stern unverified
· 200.0 kW · Retractable azimuth thruster
Power (kW)
200
Thrust (kN)
26.0
Diameter (mm)
540
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (26 kN at 200 kW) gives strong low‑speed manoeuvring capability.
  • Retractable design eliminates propeller drag during transit, improving fuel efficiency.
  • Compact 540 mm diameter allows installation on vessels with limited hull space or retrofits.
  • Azimuth rotation provides 360° thrust vectoring for precise positioning and docking.
  • Integrated hydraulic/electrical drive (typical of Hydromaster units) reduces mechanical complexity.
Weaknesses
  • Retractable mechanism adds moving‑part wear and requires regular inspection.
  • Maximum power (200 kW) may be insufficient for large DP‑2 or high‑thrust applications.
  • Installation cost is higher than a fixed tunnel thruster of similar size.
  • Limited redundancy if only one unit is fitted; failure disables stern thrust.
  • Maintenance access can be more involved due to the retractable housing.
Typical Vessels: Handymax bulk carrierFeeder container shipProduct tanker (≤30 kt)Offshore supply vesselCruise ferry
Decision Guide: Choose the HM‑RAT‑200 when you need strong, 360° thrust on a medium‑size vessel while keeping hull resistance low – especially for DP‑1 or DP‑2 operations, tight port manoeuvring, and retrofit projects where space is limited. Avoid it if the vessel requires higher than 300 kW power, very high thrust levels, or multiple redundant thrusters for critical DP‑3 missions.
Use Cases: The unit is typically installed on the stern of mid‑size commercial ships to provide precise low‑speed control during docking, offshore support operations, and dynamic positioning. Its retractable feature is valued on vessels that spend most of their time under way, as it can be pulled into the hull to reduce drag and protect the propeller from debris.
Datasheet
HM-RAT-300 bow unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
39.0
Diameter (mm)
610
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈13 kN per 100 kW) for strong low‑speed maneuvering
  • Retractable design reduces hydrodynamic drag during transit, improving fuel efficiency
  • Compact footprint fits into limited bow space on medium‑size vessels
  • Azimuth capability provides 360° thrust vectoring for precise docking and station‑keeping
  • Standard 300 kW motor size matches many existing vessel power distributions
Weaknesses
  • Retractable mechanism adds mechanical complexity and requires regular inspection
  • Limited to bow installation; not suitable where stern thruster is required without additional unit
  • Maximum thrust of 39 kN may be insufficient for very large vessels or extreme weather conditions
  • Installation depth constraints – hull must accommodate 610 mm propeller when extended
Typical Vessels: Offshore supply vesselContainer feederRo‑Ro ferryCruise ship (mid‑size)Coastal bulk carrier
Decision Guide: Choose if you need a high‑thrust, space‑saving bow thruster for vessels up to roughly 30 000 gt that operate frequently in confined ports or require reduced drag during long voyages. Avoid if the vessel demands higher thrust levels, has limited hull depth for retraction, or prefers a simpler fixed‑pitch thruster with fewer moving parts.
Use Cases: The HM‑RAT‑300 is typically installed on medium‑size commercial ships that need strong low‑speed maneuverability—such as offshore supply vessels docking at rigs, container feeders navigating tight berths, and cruise ships performing precise port turns. Its retractable feature is valuable for vessels that spend long periods underway where drag reduction translates to fuel savings.
Datasheet
HM-RAT-300 stern unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
39.0
Diameter (mm)
610
Type
retractable
Location
stern
Strengths
  • Retractable design reduces hull resistance when the unit is stowed, improving fuel efficiency during transit.
  • High thrust‑to‑power ratio (39 kN @ 300 kW) provides strong low‑speed maneuverability and DP capability.
  • Compact 610 mm diameter fits vessels with limited stern space or narrow hull forms.
  • Azimuth rotation offers 360° thrust vectoring for precise station‑keeping and docking.
  • Hydromaster’s modular design simplifies installation and future upgrades.
Weaknesses
  • Retractable mechanism adds mechanical complexity, leading to higher maintenance requirements compared with fixed thrusters.
  • Initial procurement cost is typically greater than that of a comparable fixed azimuth unit.
  • Requires hull penetration and sealing; improper installation can increase risk of water ingress.
  • Limited to stern mounting due to the specific retraction geometry.
Typical Vessels: Platform Supply VesselAnchor Handling Tug Supply (AHTS)Offshore Support VesselSmall Container ShipCoastal Bulk Carrier
Decision Guide: Choose if you need high thrust for DP or tight‑maneuvering operations while wanting to minimise drag during cruising, and you have sufficient budget for a retractable system. Avoid if you prefer the lower lifecycle cost and simplicity of a fixed thruster or lack the required hull space for retraction hardware.
Use Cases: The HM-RAT-300 is typically deployed on offshore support vessels that require dynamic positioning for station‑keeping near rigs, as well as on ships that need strong low‑speed thrust for port entry/exit where reduced drag during open‑water travel is advantageous.
Datasheet
HM-RAT-500 bow unverified
· 500.0 kW · retractable azimuth thruster
Power (kW)
500
Thrust (kN)
65.0
Diameter (mm)
750
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio for a 500 kW unit
  • Retractable design reduces hydrodynamic resistance during transit
  • Full 360° rotation gives excellent maneuverability and DP capability
  • Compact diameter (750 mm) fits in moderate‑size hulls
  • Hydromaster’s proven hydraulic drive system offers reliable response
Weaknesses
  • Mechanical complexity of the retractable mechanism increases maintenance requirements
  • Higher initial cost compared with fixed tunnel thrusters of similar power
  • Potential for retraction failure if not inspected regularly
  • Limited thrust compared to larger fixed tunnel units on high‑displacement ships
  • Requires dedicated hydraulic power and control integration
Typical Vessels: Platform Supply Vessel (PSV)Offshore Support Vessel (OSV)Anchor Handling Tug Supply (AHTS)Medium‑size Container FeederRo‑Ro / Ferry
Decision Guide: Choose if: you need high maneuverability, DP capability, and want to minimise drag during cruising; vessel has space for a retractable unit and can support hydraulic control. Avoid if: budget is tight, maintenance resources are limited, or the vessel operates primarily at low speeds where a fixed tunnel thruster would be more economical.
Use Cases: The HM‑RAT‑500 is typically installed on the bow of offshore supply ships to aid in precise positioning during cargo transfer, mooring operations, and harbor entry/exit. Its retractable feature allows the vessel to maintain fuel efficiency on long transits while still providing powerful thrust when needed for dynamic positioning or tight maneuvering.
Datasheet
HM-RAT-500 stern unverified
· 500.0 kW · retractable azimuth thruster
Power (kW)
500
Thrust (kN)
65.0
Diameter (mm)
750
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (65 kN at 500 kW) for strong low‑speed manoeuvring
  • Retractable design reduces hull resistance and fuel consumption when not in use
  • 360° rotation gives excellent directional control for docking and DP operations
  • Compact diameter (750 mm) fits into moderate‑size stern tunnels
Weaknesses
  • Limited to 500 kW; may be undersized for large tankers or high‑power DP vessels
  • Mechanical retract/extend system adds complexity and maintenance requirements
  • Potential for seal wear in the tunnel, requiring regular inspection
  • Higher initial cost compared with fixed thrusters of similar power
Typical Vessels: Offshore supply vesselAnchor handling tug‑supply (AHTS)Coastal ferryMedium‑size container feederWorkboat / crew transfer vessel
Decision Guide: Choose if: you need high manoeuvrability on a medium‑size vessel, want drag reduction when the thruster is not in use, and can accommodate the maintenance of a retractable system. Avoid if: the vessel requires higher thrust than 65 kN, prefers a simpler fixed installation, or operates in environments where mechanical complexity poses reliability concerns.
Use Cases: The HM‑RAT‑500 is typically installed on vessels that require precise port handling, dynamic positioning for offshore support, and occasional high‑thrust manoeuvres such as tug assistance. Its retractable feature makes it attractive for ships that spend most of their time cruising at speed but need a powerful thruster for low‑speed operations.
Datasheet
HM-RAT-750 bow unverified
· 750.0 kW · Retractable azimuth thruster
Power (kW)
750
Thrust (kN)
97.5
Diameter (mm)
925
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (97.5 kN from 750 kW) gives strong bow control on medium‑size vessels.
  • Retractable design reduces hydrodynamic resistance when the thruster is not in use, improving fuel efficiency.
  • Compact 925 mm propeller diameter fits into tighter hull spaces, allowing installation on a range of vessel sizes.
  • Azimuth capability provides 360° thrust vectoring for precise docking and low‑speed manoeuvring.
  • Integrated control system (typically joystick or DP interface) simplifies operator handling.
Weaknesses
  • Retractable mechanism adds mechanical complexity and requires regular inspection and maintenance.
  • Initial procurement cost is higher than a comparable fixed thruster of similar power.
  • When retracted, the unit occupies internal hull volume that could otherwise be used for cargo or systems.
  • Potential for fouling or debris ingress in the housing if not sealed properly during long voyages.
  • Maximum thrust may be lower than larger fixed bow thrusters on high‑displacement ships.
Typical Vessels: Cruise shipsOffshore supply vesselsContainer ships (mid‑size)FerriesLNG carriers (medium size)
Decision Guide: Choose the HM‑RAT‑750 if you need strong, 360° bow control on a vessel that benefits from reduced drag during cruising – typical for ships with frequent port calls or dynamic positioning requirements. Avoid it when budget constraints are tight, the vessel is small enough to use a simpler fixed thruster, or internal hull space is at a premium.
Use Cases: The unit is commonly deployed on vessels that require precise low‑speed manoeuvring in confined ports, dynamic positioning for offshore operations, and frequent docking/undocking cycles where retractability saves fuel by eliminating drag when the thruster is not needed.
Datasheet
HM-RAT-750 stern unverified
· 750.0 kW · retractable azimuth thruster
Power (kW)
750
Thrust (kN)
97.5
Diameter (mm)
925
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈13 kN per 100 kW) for a 750 kW unit
  • Retractable design reduces hull resistance when not in use, improving fuel efficiency
  • Full 360° thrust vectoring enables excellent low‑speed maneuverability and DP capability
  • Compact 925 mm propeller diameter fits within limited stern space
  • Integrated control interface compatible with most ship automation systems
Weaknesses
  • Complex retractable mechanism adds to installation cost and maintenance requirements
  • Requires dedicated housing volume in the hull, limiting applicability on smaller vessels
  • Higher initial purchase price compared with fixed tunnel thrusters of similar power
  • Potential for reduced thrust efficiency at very low RPM due to gear‑box design
  • Spare parts inventory may be less common than for mainstream manufacturers
Typical Vessels: Offshore Support VesselAnchor Handling Tug Supply (AHTS)DP‑class Platform Supply VesselCruise ShipFerry
Decision Guide: Choose if you need high thrust for DP or tight‑berth maneuvers and want the drag‑reduction benefit of a retractable unit. Avoid if budget is constrained, hull space at the stern is limited, or you prefer a simpler fixed thruster with lower lifecycle cost.
Use Cases: The HM-RAT-750 is typically installed on offshore support ships that require dynamic positioning for station‑keeping while also cruising long distances where retraction saves fuel. It is also used on cruise liners and ferries to aid in port entry/exit and emergency maneuvering, with the thruster retracted during normal sailing.
Datasheet
HM-RAT-1000 bow unverified
· 1000.0 kW · retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
130.0
Diameter (mm)
1100
Type
retractable
Location
bow
Strengths
  • High thrust (130 kN) relative to its 1 000 kW power rating gives excellent bollard pull for docking and undocking.
  • Retractable design reduces hull resistance during transit and protects the propeller from debris.
  • Compact 1.1 m diameter fits into relatively narrow bow spaces, allowing installation on vessels with limited beam.
  • Integrated control electronics are compatible with common bridge navigation systems for easy operation.
Weaknesses
  • Mechanical retraction mechanism adds complexity and requires regular inspection of seals and moving parts.
  • Higher initial purchase price compared with fixed tunnel thrusters of similar power.
  • Maintenance downtime can be longer due to the need to service the retractable shaft and hydraulic system.
  • Thrust may drop off at very low RPMs, limiting performance for vessels that need extreme low‑speed bollard pull.
Typical Vessels: Container ShipCruise ShipOffshore Supply VesselLNG CarrierRo‑Ro Ferry
Decision Guide: Choose if: you need a high‑thrust bow thruster on a vessel where hull resistance and propeller protection are critical, and you have space for a retractable unit. Avoid if: budget constraints favour simpler fixed tunnel thrusters or the vessel operates in environments where retraction mechanisms could be prone to fouling.
Use Cases: The HM‑RAT‑1000 is typically installed on large commercial ships that require precise manoeuvring in confined ports, such as container carriers entering tight berths, cruise liners docking at shore facilities, and offshore supply vessels handling dynamic positioning near platforms. Its retractable feature also makes it suitable for vessels that spend long periods underway where drag reduction is beneficial.
Datasheet
HM-RAT-1000 stern unverified
· 1000.0 kW · retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
130.0
Diameter (mm)
1100
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (130 kN at 1 MW) for strong maneuvering and DP capability
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency
  • Compact 1100 mm propeller diameter fits vessels with limited hull space
  • Integrated electronic control system enables precise thrust vectoring and quick response
  • Low vibration and noise levels compared with conventional fixed thrusters
Weaknesses
  • Retractable mechanism adds mechanical complexity and requires specialised maintenance
  • Higher initial purchase price than a comparable fixed tunnel thruster
  • Potential for fouling or debris accumulation in the retracted housing if not regularly cleaned
  • Installation may require hull modifications and reinforcement, increasing dock‑time
  • Limited to vessels that can accommodate the required shaft line and hydraulic/power supply
Typical Vessels: Offshore Supply Vessel (OSV)Dynamic Positioning (DP) vessel – DP2/DP3Cruise shipLarge container or bulk carrier requiring stern maneuverabilityLNG/LPG carrier with tight port constraints
Decision Guide: Choose if the vessel needs high‑power thrust for dynamic positioning, frequent low‑speed manoeuvring, and benefits from reduced drag during cruise. Avoid if budget is constrained, maintenance resources are limited, or the ship’s design cannot accommodate a retractable unit.
Use Cases: The HM-RAT-1000 is typically installed on offshore support ships that must hold position near rigs, on cruise liners for precise docking in congested ports, and on large cargo vessels where a stern thruster improves maneuverability without compromising fuel efficiency during long voyages.
Datasheet
HM-RAT-1500 bow unverified
· 1500.0 kW · retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
195.0
Diameter (mm)
1450
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈130 kN/MW) for strong low‑speed maneuvering
  • Retractable design eliminates tunnel resistance and improves fuel efficiency when cruising
  • Full 360° rotation provides excellent directional control for DP operations
  • Compact installation footprint suitable for vessels with limited hull space
  • Integrated electronic control unit compatible with most bridge navigation systems
Weaknesses
  • More complex mechanical system than fixed tunnel thrusters, leading to higher maintenance intervals
  • Initial capital cost is typically higher than comparable non‑retractable units
  • Requires dedicated housing and sealing arrangements in the hull structure
  • Potential for fouling or debris ingress when the unit is deployed for extended periods
  • Weight of the motor‑pump assembly can affect vessel stability if not properly compensated
Typical Vessels: Offshore supply vesselsDP‑class workboatsCruise ships and ferriesContainer ships with high maneuverability requirementsLNG carriers and other gas tankers needing precise berthing control
Decision Guide: Choose the HM‑RAT‑1500 when you need maximum thrust in a shallow‑draft or drag‑sensitive hull, require full 360° azimuth control for dynamic positioning, and can accommodate the higher upfront cost and maintenance regime. Avoid it on vessels where a simple fixed tunnel thruster meets performance needs, budget constraints dominate, or where hull modifications for a retractable housing are impractical.
Use Cases: The unit is typically deployed on DP‑class offshore support ships for station‑keeping near rigs, on cruise liners to aid tight port entries, and on high‑value cargo vessels that benefit from reduced cruising resistance while still needing strong bow thrust for berthing maneuvers.
Datasheet
HM-RAT-1500 stern unverified
· 1500.0 kW · retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
195.0
Diameter (mm)
1450
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈195 kN at 1500 kW) for strong maneuvering capability
  • Retractable unit can be folded into the hull, lowering resistance and fuel consumption when the thruster is not needed
  • Compact installation envelope fits vessels with limited stern space or narrow hull forms
  • Integrated control electronics support dynamic positioning (DP) and precise azimuth steering
  • Robust hydraulic drive system designed for continuous low‑speed operation
Weaknesses
  • Maximum power of 1500 kW may be insufficient for the largest DP‑class vessels or high‑draft tankers
  • Retractable mechanism adds mechanical complexity and requires regular inspection to prevent sticking
  • Initial procurement cost is higher than comparable fixed tunnel thrusters of similar rating
  • Potential for increased noise and vibration at full power due to exposed propeller geometry
  • Spare parts and service support are regionally concentrated, which can affect lead times
Typical Vessels: Cruise shipsOffshore supply vessels (OSV)Container feedersRo‑Ro ferriesLNG carriers with DP requirements
Decision Guide: Choose if: you need high maneuverability and the ability to hide the thruster when cruising, especially on vessels that require dynamic positioning or frequent port turns. Avoid if: your vessel exceeds the 1500 kW power envelope for DP, you prefer a simpler fixed tunnel solution, or you operate in regions where service support for retractable units is limited.
Use Cases: The HM‑RAT‑1500 is typically deployed on ships that require precise low‑speed thrust for docking, offshore station‑keeping, and emergency maneuvering. Its retractable feature makes it attractive for cruise liners and OSVs that want to minimize drag during long transits while retaining DP capability when on‑station.
Datasheet
HM-RAT-2000 bow unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
260.0
Diameter (mm)
1800
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (260 kN at 2 000 kW)
  • Retractable design reduces drag and fuel consumption while cruising
  • Full 360° rotation provides precise low‑speed manoeuvring
  • Integrated with DP2/DP3 control systems for dynamic positioning
  • Compact 1.8 m diameter fits medium‑size hull openings
Weaknesses
  • Complex retractable mechanism increases maintenance requirements
  • Higher upfront cost than comparable fixed tunnel thrusters
  • Requires dedicated hydraulic and control space in the machinery layout
  • Noise and vibration can be noticeable when fully deployed
  • Installation limited to vessels that can accommodate a 1.8 m tunnel aperture
Typical Vessels: Offshore Supply VesselDynamic Positioning VesselCruise ShipContainer Ship (large)Bulk Carrier (large)
Certifications: DNV GL ApprovalABS ClassificationLloyd's Register Approval
Decision Guide: Choose if you need high bow thrust for DP or tight‑port manoeuvring and want to minimise transit resistance. Avoid if budget is constrained, the vessel cannot accommodate the retractable tunnel, or only low manoeuvrability is required.
Use Cases: Deployed on offshore support vessels performing dynamic positioning near rigs, cruise liners docking in confined harbours, large container ships needing bow assistance for berthing, and bulk carriers operating in restricted waterways.
Datasheet
HM-RAT-2000 stern unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
260.0
Diameter (mm)
1800
Type
retractable
Location
stern
Strengths
  • High power‑to‑thrust ratio (2000 kW → 260 kN) gives strong maneuverability even on large vessels
  • Retractable design reduces hull resistance when the unit is stowed, improving fuel efficiency
  • 360° rotation provides omni‑directional thrust for fine DP control and rapid emergency stops
  • Integrated electronic control system compatible with most bridge navigation suites
  • Robust 1.8 m propeller diameter suited to high‑displacement ships
Weaknesses
  • Complex hydraulic/mechanical retract mechanism increases maintenance intervals
  • Higher upfront cost compared with fixed tunnel thrusters of similar power
  • Requires dedicated stern space and structural reinforcement for installation
  • Potential for cavitation at full power in shallow water conditions
  • Spare‑part inventory is specific to Hydromaster, limiting interchangeability
Typical Vessels: Very Large Crude Carriers (VLCC)LNG carriersOffshore supply vesselsCruise shipsContainer ships >20 000 TEU with DP requirements
Decision Guide: Choose if the vessel needs high thrust for dynamic positioning, frequent low‑speed maneuvering, or wants to minimise drag when the thruster is not in use. Avoid if budget constraints dominate, hull space at the stern is limited, or a simpler fixed tunnel thruster meets the operational profile.
Use Cases: The HM‑RAT‑2000 is typically deployed on large DP‑class vessels for station‑keeping during offshore operations, tight port entries/exits, and emergency maneuvering where rapid thrust vectoring is critical. Its retractable feature is valued on long‑haul ships that spend most of their time underway and wish to reduce added resistance.
Datasheet
HM-RAT-2500 bow unverified
· 2500.0 kW · Retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
325.0
Diameter (mm)
2150
Type
retractable
Location
bow
Strengths
  • High thrust (325 kN) enables rapid lateral movement even on very large ships
  • Retractable design reduces hull resistance and protects the propeller when not in use
  • Azimuth rotation provides 360° thrust vectoring for precise maneuvering
  • Integrated hydraulic drive offers smooth, fine‑grade control suitable for DP operations
Weaknesses
  • Complex retractable mechanism increases maintenance intervals and spare‑part inventory
  • Higher initial capital cost compared with fixed bow thrusters of similar power
  • Requires dedicated hydraulic power unit and space in machinery layout
  • Potential for seal wear in the retraction tube, demanding regular inspection
Typical Vessels: Container shipCrude oil tankerLNG carrierCruise linerOffshore supply vesselHeavy lift / RoRo vessel
Decision Guide: Choose if: you need high lateral thrust for a large vessel, operate in confined ports or require dynamic positioning and want the drag‑reduction benefit of a retractable unit. Avoid if: budget is limited, vessel size does not justify 2 500 kW bow power, or maintenance resources for hydraulic/retractable systems are constrained.
Use Cases: The HM-RAT-2500 is typically installed on deep‑draft cargo ships and offshore vessels to assist with tight berth handling, emergency lateral stops, and dynamic positioning during offshore operations. Its retractable feature allows the thruster to be stowed during open‑sea transit to minimise fuel consumption.
Datasheet
HM-RAT-2500 stern unverified
· 2500.0 kW · retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
325.0
Diameter (mm)
2150
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈325 kN @ 2500 kW)
  • Retractable design reduces hydrodynamic resistance during transit
  • Full 360° rotation provides excellent maneuverability and DP capability
  • Compact footprint compared with fixed tunnel thrusters of similar power
  • Proven Hydromaster reliability and service network
Weaknesses
  • Complex retract/extend mechanism increases maintenance requirements
  • Higher initial capital cost versus conventional fixed thrusters
  • Requires sufficient hull space and structural reinforcement for the retraction tube
  • Potential sealing issues in harsh offshore environments if not properly maintained
  • Weight and installation complexity may affect vessel stability calculations
Typical Vessels: Offshore Support Vessel (OSV)Dynamic Positioning (DP) vesselCruise shipLNG carrier with DP requirementsLarge tanker or bulk carrier needing enhanced maneuverability
Certifications: IMO Type ApprovalDNV
Decision Guide: Choose if you need high thrust for dynamic positioning and want drag reduction during cruising, and the vessel can accommodate a retractable unit. Avoid if budget constraints are tight, hull space is limited, or you prefer a simpler fixed‑type thruster with lower maintenance overhead.
Use Cases: The HM-RAT-2500 is typically installed on offshore support ships for precise station‑keeping during drilling operations, on cruise liners for tight port manoeuvring, and on DP‑class tankers where reduced transit resistance improves fuel efficiency while still providing powerful thrust when required.
Datasheet
HM-RAT-3000 bow unverified
· 3000.0 kW · retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
390.0
Diameter (mm)
2500
Type
retractable
Location
bow
Strengths
  • High thrust-to-power ratio (≈390 kN at 3 000 kW) suitable for large vessels requiring strong bow assistance
  • Retractable design minimizes hydrodynamic resistance when not in use, improving fuel efficiency
  • 360° rotation provides excellent maneuverability for tight berthing and dynamic positioning
  • Large 2.5 m propeller diameter enhances low‑speed thrust control
  • Compact installation footprint compared with fixed tunnel thrusters
Weaknesses
  • Complex deployment/retraction mechanism increases maintenance requirements and potential failure points
  • Higher initial capital cost than conventional fixed bow thrusters of similar power
  • Requires dedicated hull space for the retracted housing, affecting internal layout
  • Potential noise and vibration transmission to the hull when operating at high power
  • Limited availability of spare parts if Hydromaster has a small global service network
Typical Vessels: Container ships (≥8 000 TEU)Crude oil tankers (VLCC, Suezmax)LNG carriersOffshore supply vesselsCruise ships
Decision Guide: Choose if the vessel needs maximum bow thrust for port maneuvering or dynamic positioning while preserving hull efficiency during cruise; especially valuable on deep‑draft, high‑capacity ships where a fixed tunnel thruster would cause excessive drag. Avoid if budget constraints dominate, maintenance resources are limited, or the ship operates primarily in open water with minimal low‑speed maneuvering requirements.
Use Cases: The HM-RAT-3000 is typically installed on large ocean-going vessels that must berth in congested ports, perform offshore support operations requiring precise station‑keeping, or operate under ice‑class conditions where rapid thrust changes are essential. Its retractable feature allows the thruster to be hidden during long voyages, reducing resistance and fuel consumption.
Datasheet
HM-RAT-3000 stern unverified
· 3000.0 kW · retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
390.0
Diameter (mm)
2500
Type
retractable
Location
stern
Strengths
  • High thrust output (≈390 kN) for a 3 MW unit, enabling rapid manoeuvring and DP capability
  • Retractable design eliminates tunnel resistance when the thruster is stowed, preserving fuel efficiency at speed
  • Compact installation footprint – suitable for vessels with limited hull space or low freeboard
  • Full‑360° azimuth steering provides precise thrust vectoring for tight port operations
  • Integrated control interface compatible with most ship bridge automation systems
Weaknesses
  • Mechanical complexity of the deployment/retraction mechanism increases maintenance requirements
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power
  • Potential for fouling or damage to the propeller when operating in debris‑laden waters
  • Requires dedicated hull cut‑outs and sealing arrangements, impacting structural design
  • Limited thrust margin if the unit is operated at reduced speed for extended periods
Typical Vessels: Very Large Crude Carriers (VLCC)Ultra‑Large Container Vessels (ULCV)Cruise shipsOffshore Supply Vessels (OSV)LNG carriers with space constraints
Decision Guide: Choose if: you need high manoeuvring thrust on a large vessel while maintaining low drag during transit, and you have the hull space for a retractable unit. Avoid if: budget is tight, maintenance resources are limited, or the vessel’s operational profile does not demand the extra thrust capability.
Use Cases: The HM‑RAT‑3000 is typically deployed on deep‑draft tankers and cruise ships that must berth in confined ports, as well as offshore support vessels requiring dynamic positioning. Its retractable nature allows the ship to retain optimal hydrodynamic performance while still providing powerful bow‑/stern‑side thrust when needed for docking, undocking, or station‑keeping.
Datasheet

Nakashima Thruster

18
NK-RAT-200 bow unverified
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
26.0
Diameter (mm)
540
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (26 kN from 200 kW)
  • Retractable design reduces hull resistance and allows operation in shallow draft ports
  • 360° thrust vectoring gives precise low‑speed maneuverability for docking and station‑keeping
  • Compact 540 mm propeller diameter fits vessels with limited hull space
  • Integrated control interface compatible with most bridge navigation systems
Weaknesses
  • Mechanical retraction mechanism adds complexity and maintenance requirements
  • Maximum thrust lower than comparable fixed tunnel thrusters of the same power rating
  • Higher upfront cost due to retractable system and specialised components
  • Potential for reduced performance in heavy seas when the unit is retracted
  • Limited global service network if Nakashima has a small dealer base
Typical Vessels: Offshore supply vesselCruise shipFerryContainer ship (mid‑size)LNG carrier (moderate size)
Decision Guide: Choose if the vessel needs high maneuverability in confined or shallow ports and can benefit from reduced drag during cruising. Avoid if budget is tight, maximum thrust is critical, or a proven global support network is required.
Use Cases: Commonly installed on offshore support vessels and passenger ships that frequently dock at ports with limited depth, where the ability to retract the thruster saves fuel and protects the unit from grounding while still providing strong bow‑side thrust for precise handling.
Datasheet
NK-RAT-200 stern unverified
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
26.0
Diameter (mm)
540
Type
retractable
Location
stern
Strengths
  • Retractable design lowers hull resistance and improves fuel efficiency during transit.
  • High thrust‑to‑power ratio (26 kN at 200 kW) provides strong low‑speed maneuverability.
  • Compact 540 mm propeller diameter fits in limited hull spaces, suitable for retrofits.
  • Azimuth capability gives 360° thrust vectoring for precise positioning and docking.
  • Sealed bearing arrangement reduces maintenance intervals compared with exposed fixed thrusters.
Weaknesses
  • Mechanical retract/extend mechanism adds complexity and potential failure points.
  • Maximum continuous thrust is lower than a similarly powered fixed tunnel thruster.
  • Higher upfront cost due to retractable system and control electronics.
  • Requires dedicated hull cut‑out and structural reinforcement for the retraction housing.
Typical Vessels: Offshore Supply VesselAnchor Handling Tug Supply (AHTS)Cruise ShipFerryDynamic Positioning research vessel
Decision Guide: Choose the NK‑RAT‑200 when a vessel needs high maneuverability and wants to minimise drag during cruising, such as offshore support ships or cruise ferries that frequently dock. Avoid it on vessels that demand continuous high thrust (e.g., large tankers) or where simplicity and lowest life‑cycle cost are paramount.
Use Cases: The thruster is typically deployed for precise low‑speed maneuvers, dynamic positioning during offshore operations, and rapid docking/undocking of passenger ships. Its retractable feature allows the vessel to cruise with reduced resistance, making it popular on vessels that alternate between high‑maneuverability tasks and long transits.
Datasheet
NK-RAT-300 bow unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
39.0
Diameter (mm)
610
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈39 kN at 300 kW)
  • Retractable design reduces hull resistance during cruising
  • Compact 610 mm propeller diameter fits vessels with limited bow space
  • Integrated control system compatible with common bridge consoles
  • Balanced impeller design lowers vibration and noise
Weaknesses
  • Requires dedicated hydraulic/electric retraction mechanism, adding complexity
  • Installation depth limits suitability for very shallow‑draft vessels
  • Maintenance access can be more involved than fixed tunnel thrusters
  • Higher initial cost compared with conventional fixed bow thrusters of similar power
  • Performance may be affected by debris when fully deployed
Typical Vessels: Offshore supply vesselCruise shipContainer shipLNG carrierFerryBulk carrier (retrofit)
Decision Guide: Choose if you need strong low‑speed maneuverability on a vessel where hull resistance must be kept low during transit, especially when bow space is limited or frequent port operations are required. Avoid if the vessel operates in extremely shallow water, has strict budget constraints, or prefers the simplicity of a fixed tunnel thruster.
Use Cases: Typically installed on offshore supply vessels, cruise liners, container ships and LNG carriers to provide precise docking assistance, dynamic positioning support, and emergency maneuvering. Frequently used in retrofits where cutting a permanent bow tunnel is impractical.
Datasheet
NK-RAT-300 stern unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
39.0
Diameter (mm)
610
Type
retractable
Location
stern
Strengths
  • High thrust (39 kN) for a compact 610 mm diameter unit
  • Retractable design lowers drag and improves fuel efficiency when the thruster is stowed
  • 360° rotation provides excellent maneuverability for low‑speed docking and DP operations
  • Compact footprint fits vessels with limited hull space or narrow tunnel sections
  • Control interface compatible with most modern dynamic positioning systems
Weaknesses
  • More moving parts than a fixed tunnel thruster, leading to higher maintenance requirements
  • Higher upfront cost compared with conventional fixed‑type thrusters of similar power
  • Maximum thrust is lower than that of larger fixed azimuth units for the same power rating
  • Reliance on hydraulic/electrical actuation for retraction introduces an additional failure point
  • Requires dedicated space and routing for retraction mechanism and control lines
Typical Vessels: Offshore Supply VesselCruise Ship (mid‑size)Container Ship (500–2,000 TEU)FerrySmall LNG Carrier
Decision Guide: Choose the NK‑RAT‑300 when you need high maneuverability and want to minimise hull resistance in vessels with limited space for a fixed tunnel thruster. It is well suited for ships that operate in confined ports or require dynamic positioning. Avoid it on projects where budget constraints dominate, maintenance resources are limited, or maximum thrust beyond 39 kN is required.
Use Cases: The NK‑RAT‑300 is typically installed at the stern of medium‑size vessels to aid in tight port turns, berthing assistance, and low‑speed maneuvering. Its retractable feature makes it popular on offshore supply ships that need both high thrust for DP work and reduced drag during transit, as well as on cruise liners where fuel efficiency is a priority.
Datasheet
NK-RAT-500 bow unverified
· 500.0 kW · retractable azimuth bow thruster
Power (kW)
500
Thrust (kN)
65.0
Diameter (mm)
750
Type
retractable
Location
bow
Strengths
  • High thrust (≈65 kN) relative to power, improving low‑speed manoeuvrability and DP performance.
  • Retractable design eliminates tunnel resistance during transit, saving fuel.
  • Compact installation – fits in vessels where a fixed tunnel thruster would be impractical.
  • Direct drive arrangement provides quick response and precise thrust vectoring.
Weaknesses
  • More complex mechanical system (retract/extend mechanism) increases maintenance requirements.
  • Higher upfront cost compared with conventional fixed tunnel thrusters of similar power.
  • Limited maximum thrust compared to a similarly powered fixed tunnel thruster due to space constraints.
  • Requires dedicated bow space and structural reinforcement for the retractable housing.
Typical Vessels: Offshore supply vessel (OSV)Platform supply vessel (PSV)Dynamic positioning (DP) workboatCruise ferryMedium‑size container or bulk carrier needing enhanced bow maneuverability
Decision Guide: Choose if the vessel needs high thrust for DP or tight‑port operations while wanting to minimise drag during normal sailing, and when hull space does not allow a fixed tunnel thruster. Avoid if budget is limited, maintenance resources are scarce, or the design already incorporates an adequate fixed tunnel system.
Use Cases: Commonly installed on offshore support vessels that perform dynamic positioning near rigs, on ferries docking in confined harbours, and on new builds where designers prefer a retractable solution to keep hull resistance low while still providing strong bow thrust for manoeuvring.
Datasheet
NK-RAT-500 stern unverified
· 500.0 kW · retractable azimuth thruster
Power (kW)
500
Thrust (kN)
65.0
Diameter (mm)
750
Type
retractable
Location
stern
Strengths
  • Retractable design eliminates hull protrusion, reducing resistance and improving fuel efficiency during transit.
  • Azimuth capability provides 360° thrust vectoring for superior maneuverability and dynamic positioning support.
  • Compact 750 mm propeller diameter fits vessels with limited hull space while delivering up to 65 kN of thrust.
  • Integrated retraction mechanism allows quick deployment/retraction from the bridge or automated control system.
Weaknesses
  • Mechanical retraction system adds complexity and requires regular inspection to prevent jamming or seal failures.
  • Maximum thrust (65 kN) may be lower than fixed thrusters of comparable power on very large vessels.
  • Installation demands a dedicated stern tunnel and structural reinforcement, increasing initial fit‑out cost.
  • Potential for increased maintenance downtime if the hydraulic/electric actuation system fails.
Typical Vessels: Offshore supply vesselCruise shipHigh‑speed ferryLNG carrier with dynamic positioningContainer ship requiring enhanced low‑speed maneuverability
Decision Guide: Choose if: you need a high‑maneuverability thruster on a vessel where hull protrusion must be avoided, such as fast ferries or ships that spend long periods under way and benefit from reduced drag. Avoid if: the vessel requires maximum thrust for heavy berthing operations and can accommodate a fixed tunnel thruster, or if maintenance resources are limited for retractable mechanisms.
Use Cases: The NK‑RAT‑500 is typically deployed on vessels that alternate between high‑speed transit (where retraction reduces resistance) and low‑speed maneuvering or dynamic positioning (where rapid thrust vectoring is essential). It is common on offshore supply ships operating near rigs, cruise liners docking in tight ports, and fast ferries navigating congested waterways.
Datasheet
NK-RAT-750 bow unverified
· 750.0 kW · retractable azimuth thruster
Power (kW)
750
Thrust (kN)
97.5
Diameter (mm)
925
Type
retractable
Location
bow
Strengths
  • Very high thrust‑to‑power ratio (≈97.5 kN at 750 kW) suitable for DP2/DP3 operations
  • Retractable design reduces drag when not in use and protects the unit in heavy seas
  • Azimuth rotation provides 360° thrust vectoring for precise maneuvering
  • Large 925 mm propeller diameter improves efficiency at lower RPMs, lowering fuel consumption
  • Compact bow installation frees internal volume compared with fixed tunnel thrusters
Weaknesses
  • Higher initial purchase and installation cost than standard fixed tunnel units
  • Complex hydraulic/mechanical retraction system adds maintenance requirements
  • Requires reinforced hull structure to accommodate the retractable housing and bearing loads
  • Potential for increased noise and vibration at high thrust levels, requiring mitigation measures
  • Limited availability of spare parts in remote regions compared with more common manufacturers
Typical Vessels: Offshore supply vessels (OSV)Dynamic positioning platformsCruise shipsLNG carriersContainer ships with high maneuverability demands
Decision Guide: Choose if: you need maximum bow thrust in a limited hull space, operate under dynamic‑positioning or tight‑berth conditions, and can accommodate the higher capital cost and maintenance of a retractable system. Avoid if: budget constraints dominate, vessel size does not justify the extra thrust, or operating environments limit access to specialized service support.
Use Cases: The NK‑RAT‑750 is typically installed on vessels that must hold position in offshore wind farms, perform precise docking in congested ports, or maneuver large hulls in restricted waterways. Its retractable feature also makes it attractive for ships that spend long periods cruising where drag reduction is valuable.
Datasheet
NK-RAT-750 stern unverified
· 750.0 kW · retractable azimuth thruster
Power (kW)
750
Thrust (kN)
97.5
Diameter (mm)
925
Type
retractable
Location
stern
Strengths
  • High thrust (97.5 kN) for a 750 kW motor gives excellent low‑speed maneuvering power
  • Retractable design eliminates hull resistance and protects the unit when not in use
  • 360° azimuth rotation provides precise vector control for docking and dynamic positioning
  • Integrated hydraulic drive and electronic control system simplify operator handling
  • Compact footprint fits into limited stern space on modern ship designs
Weaknesses
  • Retractable mechanism adds mechanical complexity and requires regular inspection
  • Higher upfront cost compared with fixed tunnel thrusters of similar power
  • Maintenance intervals are shorter due to moving seals and hydraulic components
  • Limited to stern installation; not suitable for vessels that need bow‑mounted thrust
  • Spare‑part availability may be restricted outside Nakashima’s dealer network
Typical Vessels: Offshore Supply Vessel (OSV)Anchor Handling Tug Supply (AHTS)Cruise ShipContainer ShipLNG Carrier (mid‑size)
Decision Guide: Choose if: you need high thrust for tight port maneuvers or DP, want drag reduction when the thruster is not in use, and have space constraints at the stern. Avoid if: budget is limited, you prefer a simpler fixed tunnel thruster, or the vessel requires bow‑mounted maneuvering aid.
Use Cases: The NK‑RAT‑750 is commonly installed on offshore support vessels that perform frequent close‑quarter operations, cruise ships docking in congested harbours, and mid‑size container or LNG carriers that benefit from DP capability while maintaining hull efficiency during transit.
Datasheet
NK-RAT-1000 bow unverified
· 1000.0 kW · retractable azimuth bow thruster
Power (kW)
1000
Thrust (kN)
130.0
Diameter (mm)
1100
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (130 kN at 1 000 kW) for strong maneuvering capability
  • Retractable design reduces hydrodynamic drag and protects the propeller when cruising
  • Full 360° thrust vectoring improves station‑keeping and dynamic positioning performance
  • Compact 1.1 m diameter fits into a wide range of hull forms without major structural modifications
  • Suitable for integration with DP control systems on vessels requiring precise positioning
Weaknesses
  • Retractable mechanism adds mechanical complexity and requires regular maintenance
  • Higher initial purchase and installation cost compared with fixed‑type thrusters
  • Limited operational depth; the unit must remain above the waterline when retracted, restricting use in very shallow drafts
  • High electrical power demand may necessitate upgrades to shipboard power distribution
  • Potential for hydraulic or bearing wear in the deployment/retraction system
Typical Vessels: Offshore Supply Vessel (OSV)Dynamic Positioning PlatformCruise ShipLarge Container ShipLNG CarrierAframax Tanker
Decision Guide: Choose the NK‑RAT‑1000 if you need high maneuverability, DP capability, and want to minimise cruising drag by retracting the thruster when not in use. It is ideal for vessels that operate in congested ports or offshore stations where precise positioning is critical. Avoid this model if budget constraints are tight, the vessel has limited space for a retractable housing, or the operating profile does not justify the added complexity and power consumption.
Use Cases: The NK‑RAT‑1000 is typically installed on offshore support vessels to maintain position during ROV deployment, on cruise liners to assist docking in narrow harbours, and on large tankers or container ships that require rapid lateral thrust for emergency maneuvering or DP operations in open water.
Datasheet
NK-RAT-1000 stern unverified
· 1000.0 kW · retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
130.0
Diameter (mm)
1100
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (130 kN from 1 MW) suitable for large vessels
  • Retractable design reduces hull resistance when the unit is not in use
  • Full 360° azimuth capability enables precise manoeuvring and DP operations
  • Compact diameter (1.1 m) fits into standard stern tunnel arrangements
Weaknesses
  • Complex retractable mechanism adds maintenance tasks and potential leak points
  • Higher capital cost compared with fixed shaft thrusters of similar power
  • Requires dedicated hydraulic/electrical control system integration
  • Installation demands a reinforced stern tunnel, increasing build‑out time
Typical Vessels: Container shipCrude oil tankerLiquefied gas carrierCruise linerOffshore support vessel (DP class)
Decision Guide: Choose if the vessel needs high‑precision manoeuvring, dynamic positioning or operates in confined ports where a retractable stern thruster reduces drag. Avoid if budget is tight, the ship’s operational profile does not require DP capability, or hull space for a reinforced tunnel is unavailable.
Use Cases: The NK‑RAT‑1000 is commonly installed on large commercial ships and offshore support vessels to provide thrust for docking, undocking, low‑speed manoeuvres, and dynamic positioning during offshore operations. Its retractable feature allows the vessel to cruise efficiently when thruster assistance is not required.
Datasheet
NK-RAT-1500 bow unverified
· 1500.0 kW · retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
195.0
Diameter (mm)
1450
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (195 kN at 1500 kW) suitable for dynamic positioning and tight‑maneuvering.
  • Retractable design reduces hull resistance during transit, improving fuel efficiency.
  • 360° rotation provides excellent maneuverability in confined ports or offshore sites.
  • Bow location enhances forward thrust vectoring for improved heading control.
Weaknesses
  • Complex hydraulic/mechanical retraction system increases installation and maintenance costs.
  • Requires dedicated hull space and structural reinforcement at the bow.
  • Potential for higher noise and vibration compared with fixed tunnel thrusters.
  • Limited availability of spare parts if manufacturer support is not global.
Typical Vessels: Offshore supply vesselDP‑class platform support shipCruise liner (maneuvering aid)LNG carrier (bow thruster for docking)
Decision Guide: Choose if you need high bow thrust for DP or tight‑port operations and want the drag‑reduction benefit of a retractable unit. Avoid if budget, space constraints, or limited maintenance infrastructure make a simpler fixed tunnel thruster more appropriate.
Use Cases: The NK‑RAT‑1500 is commonly installed on vessels that require precise station‑keeping—such as offshore wind support ships, oil‑rig supply boats, and cruise ships navigating congested harbours—where the ability to retract the thruster during open‑water cruising yields fuel savings.
Datasheet
NK-RAT-1500 stern unverified
· 1500.0 kW · retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
195.0
Diameter (mm)
1450
Type
retractable
Location
stern
Strengths
  • High thrust (195 kN) relative to power rating enables strong low‑speed manoeuvring.
  • Retractable design reduces hull resistance when the unit is stowed, improving fuel efficiency during transit.
  • Full 360° azimuth capability provides excellent heading control for DP and tight docking.
  • Robust construction typical of Nakashima units offers good durability in harsh marine environments.
Weaknesses
  • Mechanical retractable mechanism adds complexity and requires regular maintenance.
  • Higher upfront cost compared with fixed tunnel thrusters of similar power.
  • Installation demands sufficient hull space and structural reinforcement at the stern.
  • Potential for hydraulic or electrical system failures due to additional moving parts.
Typical Vessels: Offshore Supply VesselAnchor Handling Tug Supply (AHTS)Drillship / DP‑class vesselCruise shipLarge container or bulk carrier requiring enhanced stern maneuverability
Decision Guide: Choose if the vessel needs high‑power, low‑speed thrust for dynamic positioning, tight port entry/exit, or offshore operations and can accommodate a retractable unit. Avoid if budget constraints, limited maintenance capability, or the ship’s operational profile does not demand such maneuverability.
Use Cases: The NK‑RAT‑1500 is typically deployed on vessels that perform offshore support tasks, require DP for station‑keeping during drilling or subsea work, and need rapid stern thrust for safe docking in confined harbours. It is also used on cruise ships to aid in precise berthing.
Datasheet
NK-RAT-2000 bow unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
260.0
Diameter (mm)
1800
Type
retractable
Location
bow
Strengths
  • High power‑to‑thrust ratio (2000 kW → 260 kN) for excellent low‑speed maneuverability
  • Retractable design lowers hull resistance and fuel consumption when the thruster is not required
  • Azimuth capability provides 360° thrust vectoring, ideal for dynamic positioning (DP) operations
  • Robust marine‑grade construction typical of Nakashima products, suited to harsh offshore environments
  • Compact diameter (1.8 m) fits within limited hull space while still delivering high thrust
Weaknesses
  • Complex retractable mechanism increases installation and maintenance costs compared with fixed thrusters
  • Requires dedicated hydraulic/electrical infrastructure and control integration on board
  • Potential for seal or bearing wear in the retraction system, leading to higher inspection intervals
  • Limited retrofit suitability for vessels without sufficient hull volume for the retracted unit
  • Higher initial capital outlay than conventional fixed bow thrusters of similar power
Typical Vessels: Offshore supply vessel (OSV)Dynamic positioning tanker or product carrierCruise shipLarge container vessel with DP capabilityLNG/LPG carrier requiring precise maneuvering
Decision Guide: Choose if: the vessel needs high thrust for tight‑port operations, dynamic positioning, or offshore work and can accommodate a retractable unit to gain drag reduction when cruising. Avoid if: budget constraints dominate, hull space is insufficient for retraction, or a simpler fixed thruster meets the maneuverability requirements.
Use Cases: The NK‑RAT‑2000 is typically installed on new builds that require strong bow thrust for DP‑enabled offshore support, precise docking in confined harbors, and rapid emergency maneuvers. Its retractable feature is exploited during open‑sea transits to minimise resistance, while the azimuth capability is used for station‑keeping during offshore installations or subsea interventions.
Datasheet
NK-RAT-2000 stern unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
260.0
Diameter (mm)
1800
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (260 kN from 2 MW) enables strong low‑speed manoeuvring.
  • Retractable design reduces hull resistance when the unit is stowed, improving fuel efficiency during transit.
  • Full 360° azimuth capability gives excellent DP and docking control.
  • Integrated hydraulic drive with built‑in fault monitoring simplifies operation on modern vessels.
  • Compact vertical profile (1800 mm diameter) fits in limited stern space compared to fixed tunnel thrusters.
Weaknesses
  • Complex retractable mechanism adds installation cost and requires regular maintenance.
  • Large propeller diameter may limit fitment on vessels with narrow aft sections or shallow hull forms.
  • High electrical demand (2 MW) necessitates robust shipboard power distribution and backup systems.
  • Potential for hydraulic leaks or seal wear in the retraction system under heavy use.
  • Weight and structural reinforcement requirements can increase overall vessel weight.
Typical Vessels: Offshore Support VesselDynamic Positioning DrillshipLNG Carrier (DP‑2/3)Cruise ShipLarge Tanker with DP capability
Decision Guide: Choose if: you need high thrust for DP or tight port manoeuvring and want to minimise transit drag by stowing the thruster. Avoid if: budget constraints limit complex systems, vessel geometry cannot accommodate a retractable unit, or operating profile does not require frequent low‑speed thrust.
Use Cases: The NK‑RAT‑2000 is typically installed on vessels that perform offshore operations requiring precise station‑keeping (e.g., ROV deployment, drilling), as well as large passenger or cargo ships that benefit from reduced drag during open‑water cruising while retaining powerful thruster assistance for docking and emergency manoeuvres.
Datasheet
NK-RAT-2500 bow unverified
· 2500.0 kW · retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
325.0
Diameter (mm)
2150
Type
retractable
Location
bow
Strengths
  • High thrust-to‑power ratio (≈325 kN at 2.5 MW) enables strong lateral forces for large vessels.
  • Retractable design reduces hull resistance when the thruster is not in use, improving fuel efficiency.
  • Compact 2.15 m propeller diameter fits within standard bow tunnel dimensions.
  • Integrated control electronics support DP‑class operation and automated maneuvering.
  • Japanese engineering reputation for reliability and low vibration.
Weaknesses
  • Retractable mechanism adds mechanical complexity and requires regular inspection of hydraulic/actuator systems.
  • Higher upfront cost compared with fixed‑pitch bow thrusters of similar power.
  • Installation demands sufficient hull space and structural reinforcement for the retraction system.
  • Maintenance downtime can be longer if the retractable unit becomes jammed or leaks.
  • Power consumption is significant; auxiliary generators must be sized accordingly.
Typical Vessels: Cruise shipsOffshore supply / DP vesselsLNG carriersLarge ferriesContainer ships (≥30 000 gt)Tankers (product or chemical)
Decision Guide: Choose if you need a high‑thrust bow thruster with drag‑reduction benefits for DP or tight‑berthing maneuvers on large vessels and have the hull space for a retractable unit. Avoid if budget constraints favour simpler fixed thrusters, the vessel lacks adequate tunnel geometry, or operational profiles do not require the extra thrust capability.
Use Cases: Commonly installed on cruise liners to aid port entry/exit, on offshore support ships that must hold position beside rigs, and on LNG carriers where precise low‑speed control is critical during loading/unloading. The retractable feature is especially valued on vessels operating in shallow ports or needing reduced resistance during long voyages.
Datasheet
NK-RAT-2500 stern unverified
· 2500.0 kW · retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
325.0
Diameter (mm)
2150
Type
retractable
Location
stern
Strengths
  • High power‑to‑thrust ratio (2500 kW → 325 kN) for strong maneuvering capability
  • Retractable design reduces hull resistance and fuel consumption during transit
  • Large 2.15 m propeller diameter promotes efficient, low‑cavitation operation
  • Ideal for dynamic positioning (DP) vessels requiring precise thrust vectoring
  • Compact footprint allows installation on medium‑size offshore ships
Weaknesses
  • Mechanical complexity of the retractable mechanism increases maintenance requirements
  • Higher initial installation cost due to hull cut‑out, sealing and actuation system
  • Requires a robust electrical supply and cooling arrangement for 2500 kW rating
  • Limited suitability for vessels that cannot accommodate stern hull penetrations
Typical Vessels: Offshore Supply VesselDrillshipFPSOLNG Carrier (DP2/3)Platform Support Vessel
Decision Guide: Choose if you need high thrust for DP or station‑keeping and want the drag‑reduction benefit of a retractable unit. Avoid if budget constraints, limited hull space, or low maintenance capability make a fixed tunnel thruster more appropriate.
Use Cases: Commonly fitted on offshore support ships that perform dynamic positioning, low‑speed maneuvering in confined ports, and emergency propulsion where the ability to retract the thruster during normal cruising improves fuel efficiency.
Datasheet
NK-RAT-3000 bow unverified
· 3000.0 kW · Retractable Azimuth Thruster
Power (kW)
3000
Thrust (kN)
390.0
Diameter (mm)
2500
Type
retractable
Location
bow
Strengths
  • High power (3 000 kW) provides strong maneuvering force (≈390 kN).
  • Retractable design eliminates hull resistance and protects the propeller when cruising.
  • 360° azimuth capability enables precise thrust vectoring for DP and tight‑berth handling.
  • Compact 2.5 m diameter fits medium‑to‑large vessels without excessive hull penetration.
  • Integrated control interface compatible with most commercial DP consoles.
Weaknesses
  • Higher capital cost than fixed tunnel thrusters of comparable thrust.
  • Complex retractable mechanism adds maintenance workload and requires regular inspection.
  • Seal wear can lead to water ingress if not properly serviced.
  • Noise and vibration at full power may affect crew comfort on passenger vessels.
  • Thrust‑to‑diameter ratio is lower than that of larger ducted propellers, limiting efficiency in some regimes.
Typical Vessels: Cruise ShipOffshore Supply VesselLNG CarrierContainer ShipBulk Carrier
Decision Guide: Choose if the vessel requires high‑power bow thrust for dynamic positioning, tight port maneuvering, and wants drag reduction when cruising. Avoid if budget constraints dominate, the hull form cannot accommodate a retractable unit, or lower thrust levels are sufficient.
Use Cases: Deployed on vessels that need precise low‑speed control such as offshore support ships during DP operations, large passenger liners for berthing in confined ports, and high‑capacity cargo carriers that benefit from reduced resistance while underway.
Datasheet
NK-RAT-3000 stern unverified
· 3000.0 kW · retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
390.0
Diameter (mm)
2500
Type
retractable
Location
stern
Strengths
  • High thrust (390 kN) from a relatively compact 3 MW unit
  • Full 360° azimuth capability enables excellent low‑speed maneuverability and DP performance
  • Retractable design reduces hull resistance when not in use, improving fuel efficiency
  • Integrated control interface compatible with common dynamic positioning consoles
Weaknesses
  • Mechanical retractable mechanism adds complexity and maintenance requirements
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power
  • Thrust may drop at very low propeller speeds if the unit is optimized for higher RPM operation
  • Requires dedicated hull space and structural reinforcement at the stern
Typical Vessels: Offshore supply vesselDynamic positioning vesselLNG carrier (DP class)Cruise shipContainer ship with DP capability
Decision Guide: Choose if: you need high thrust and full azimuth control on a vessel that benefits from reduced drag when the thruster is not in use, such as DP‑class offshore or cruise ships. Avoid if: budget constraints limit capital expenditure, maintenance resources are limited, or a simpler fixed tunnel thruster would meet performance needs.
Use Cases: The NK‑RAT‑3000 is typically installed on vessels that require precise station‑keeping and tight maneuvering in confined ports or offshore environments, such as platform supply ships, LNG carriers with dynamic positioning, and cruise liners navigating narrow waterways. Its retractable feature allows the ship to maintain optimal cruising efficiency when thrust is not required.
Datasheet

Thrustmaster Marine

18
TM-RAT-200 bow unverified
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
26.0
Diameter (mm)
540
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (26 kN @ 200 kW) for effective low‑speed maneuvering
  • Compact 540 mm propeller diameter fits vessels with limited hull space
  • Retractable design reduces drag when the thruster is not in use
  • Azimuth capability provides 360° thrust vectoring for precise handling
Weaknesses
  • 200 kW power may be insufficient for very large DP‑required ships
  • Retractable mechanism adds moving parts and maintenance requirements
  • Potentially higher upfront cost compared with fixed tunnel thrusters
  • Limited published data on long‑term reliability for this specific model
Typical Vessels: Offshore supply vesselDP‑1 ferry or passenger craftMedium‑size tanker (up to ~30 kt)Workboat / tug‑assist vessel
Decision Guide: Choose if: you need a high‑thrust, compact bow thruster with the ability to retract for reduced drag and have DP‑1 or port‑maneuvering requirements. Avoid if: the vessel requires >200 kW thrust power, operates in extreme ice conditions, or you prefer a simpler fixed tunnel design with lower maintenance.
Use Cases: Typically installed at the bow of offshore support vessels to aid docking, undocking and low‑speed positioning; also used on DP‑1 ferries for precise station keeping during passenger loading/unloading.
Datasheet
TM-RAT-200 stern unverified
· 200.0 kW · retractable azimuth thruster
Power (kW)
200
Thrust (kN)
26.0
Diameter (mm)
540
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈13 kN per 100 kW) for a compact unit
  • Retractable design lowers hydrodynamic resistance during transit, improving fuel efficiency
  • 360° rotation provides excellent maneuverability and precise station‑keeping
  • Relatively small diameter (540 mm) fits in limited hull spaces common on mid‑size vessels
  • Simplified installation compared with fixed tunnel thrusters
Weaknesses
  • Mechanical complexity of the retractable mechanism can increase maintenance intervals
  • Higher upfront cost than a conventional fixed tunnel thruster of similar power
  • Limited maximum thrust (26 kN) may be insufficient for very large vessels or extreme weather DP operations
  • Potential for hull penetration leaks if sealing system degrades
Typical Vessels: Offshore supply vesselFerrySmall container shipCruise ship (mid‑size)Coastal tanker
Decision Guide: Choose if you need a compact stern thruster that can be retracted to minimise drag, require 360° thrust for tight port manoeuvring or low‑speed DP, and have space constraints. Avoid if budget is tight, the vessel demands higher absolute thrust than 26 kN, or you prefer the lower maintenance profile of a fixed tunnel unit.
Use Cases: The TM‑RAT‑200 is typically installed on vessels that operate frequently in confined harbours or offshore terminals where precise docking and low‑speed manoeuvring are critical. Its retractable feature makes it attractive for ships that also cruise at higher speeds, allowing the thruster to be stowed to reduce resistance.
Datasheet
TM-RAT-300 bow unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
39.0
Diameter (mm)
610
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (39 kN @ 300 kW) suitable for dynamic positioning and tight maneuvering
  • Retractable design eliminates hull resistance when the unit is stowed, improving fuel efficiency
  • Compact 610 mm diameter fits into moderate‑size bow tunnels without major hull modifications
  • Azimuth capability gives 360° thrust vectoring for precise control
  • Integrated motor‑controller package simplifies installation and wiring
Weaknesses
  • Mechanical retraction mechanism adds moving parts that require regular inspection and maintenance
  • Limited to bow installation; no stern option in this model
  • Power demand (300 kW) may be high for smaller vessels with limited generator capacity
  • Potential for increased noise/vibration compared with fixed tunnel thrusters
  • Higher upfront cost than basic fixed‑pitch tunnel units
Typical Vessels: Offshore supply vesselDP2/DP3 platform support shipCruise ferryMedium‑size container feederResearch / survey vessel
Decision Guide: Choose if: you need high maneuverability and DP capability on a vessel where hull drag must be minimised when the thruster is not in use, and you have sufficient onboard power. Avoid if: the ship has limited generator capacity, prefers a simpler fixed‑pitch solution, or requires stern thrust as well.
Use Cases: The TM‑RAT‑300 bow is typically deployed on offshore support ships that perform frequent station‑keeping near rigs, on cruise ferries navigating congested ports, and on research vessels that require precise low‑speed positioning for scientific work. Its retractable feature is especially valued on vessels that alternate between high‑speed transit (where drag reduction matters) and low‑speed maneuvering.
Datasheet
TM-RAT-300 stern unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
39.0
Diameter (mm)
610
Type
retractable
Location
stern
Strengths
  • High thrust‑to‑power ratio (39 kN from 300 kW) suitable for medium‑large vessels
  • Retractable design eliminates hull resistance and protects the unit during transit
  • Full 360° azimuth steering gives excellent maneuverability and DP capability
  • Compact 610 mm propeller diameter fits into limited hull spaces
  • Integrated control interface compatible with most ship bridge systems
Weaknesses
  • More complex mechanical system than a fixed thruster, leading to higher maintenance requirements
  • Requires a dedicated hull opening and sealing arrangement, increasing installation cost
  • Retractable mechanism adds weight and occupies internal volume that could be used for other equipment
  • Higher upfront purchase price compared with conventional fixed tunnel thrusters of similar power
  • Limited to stern installations; not suitable where bow thruster is required
Typical Vessels: Offshore Supply VesselPlatform Support VesselDynamic Positioning (DP) vesselCruise ShipFerryMedium‑size Container or Bulk Carrier
Decision Guide: Choose if you need high thrust and full azimuth control on a vessel where drag reduction when the thruster is not in use matters, such as DP‑equipped offshore support ships or cruise vessels. Avoid if budget constraints favor simpler fixed tunnel thrusters, if space for a retractable housing is unavailable, or if the vessel primarily requires bow‑side maneuvering.
Use Cases: The TM‑RAT‑300 is typically deployed on offshore supply and platform support vessels that require precise station‑keeping in harsh sea states, on cruise ships for tight port manoeuvring, and on DP‑class vessels where rapid thrust vector changes are essential. It is also used on ferries and medium‑size cargo ships to improve low‑speed handling while keeping hull resistance low during cruising.
Datasheet
TM-RAT-500 bow unverified
· 500.0 kW · retractable azimuth thruster
Power (kW)
500
Thrust (kN)
65.0
Diameter (mm)
750
Type
retractable
Location
bow
Strengths
  • High thrust‑to‑power ratio (65 kN from 500 kW) suitable for large vessels requiring strong low‑speed manoeuvring.
  • Retractable design reduces hull resistance and protects the propeller when not in use.
  • Compact 750 mm tunnel diameter fits into moderate‑size bow sections, allowing installation on a range of vessel classes.
  • Azimuth capability provides 360° thrust vectoring for precise handling and dynamic positioning support.
Weaknesses
  • Retractable mechanism adds complexity and requires regular inspection to prevent hydraulic or mechanical failure.
  • Higher initial purchase and installation cost compared with fixed tunnel thrusters of similar power.
  • Requires dedicated space within the hull for retraction housing, potentially impacting internal layout.
  • Maintenance downtime can be longer due to the need to access the retractable assembly.
Typical Vessels: Container shipBulk carrierTankerCruise linerOffshore supply vessel
Decision Guide: Choose if you need high manoeuvring thrust on a large vessel, operate frequently in confined ports or require dynamic positioning and want to minimise drag during transit. Avoid if the vessel is small‑to‑medium where a lower‑power fixed thruster suffices, budget constraints are tight, or hull space for a retractable housing is unavailable.
Use Cases: The TM-RAT-500 is typically deployed on deep‑draft merchant ships and offshore support vessels that must berth in restricted harbours, perform close‑quarter manoeuvres, or maintain position during offshore operations. Its retractable feature allows the thruster to be stowed when cruising to preserve fuel efficiency.
Datasheet
TM-RAT-500 stern unverified
· 500.0 kW · retractable azimuth thruster
Power (kW)
500
Thrust (kN)
65.0
Diameter (mm)
750
Type
retractable
Location
stern
Strengths
  • Full 360° thrust vectoring gives excellent low‑speed manoeuvrability and dynamic positioning capability.
  • Retractable design reduces hull resistance when the thruster is not in use, improving fuel efficiency.
  • High thrust output (65 kN) for a 500 kW unit provides strong bollard pull for large vessels.
  • Compact installation at the stern frees up deck space compared with tunnel‑type thrusters.
Weaknesses
  • Retractable mechanism adds mechanical complexity and requires regular inspection of seals and hydraulic systems.
  • Higher initial purchase and integration cost than a fixed tunnel or ducted thruster of similar power.
  • Maintenance downtime can be longer because the retraction system must be serviced in addition to the propeller unit.
Typical Vessels: Container shipTankerCruise linerOffshore supply vessel
Decision Guide: Choose if the vessel needs high‑precision manoeuvring, dynamic positioning or frequent low‑speed operations and can accommodate a retractable unit in its hull. Avoid if budget constraints, limited maintenance capability, or a simpler fixed thruster solution would meet the operational requirements.
Use Cases: Commonly installed on large commercial ships that require tight port handling, emergency stop capability, or dynamic positioning for offshore work. The retractable feature is especially valuable on vessels where drag reduction during cruise mode is a priority.
Datasheet
TM-RAT-750 bow unverified
· 750.0 kW · retractable azimuth bow thruster
Power (kW)
750
Thrust (kN)
97.5
Diameter (mm)
925
Type
retractable
Location
bow
Strengths
  • High power (750 kW) and thrust (97.5 kN) suitable for DP2/DP3 operations
  • Retractable design reduces hydrodynamic drag when not in use, improving fuel efficiency
  • Compact 925 mm propeller diameter fits within limited hull space
  • Full‑circle azimuth steering provides excellent maneuverability in tight ports
  • Integrated control interface compatible with most DP systems
Weaknesses
  • Complex retractable mechanism increases maintenance requirements and potential failure points
  • Higher initial cost compared with fixed bow thrusters of similar power
  • Installation may require significant hull modifications to accommodate the retraction housing
  • Power consumption is substantial, impacting overall vessel fuel budget
  • Limited suitability for ice‑class or heavily fouled operating environments
Typical Vessels: Offshore Supply Vessel (OSV)Dynamic Positioning Platform Supply VesselAnchor Handling Tug Supply (AHTS) – larger unitsCruise Ship (mid‑size to large)LNG Carrier (DP equipped)
Decision Guide: Choose if: you need high thrust for precise DP work, want drag reduction during transit, and have the hull space for a retractable unit. Avoid if: vessel operates in ice or heavily fouled waters, budget constraints limit upfront cost, or you prefer a simpler fixed‑type thruster with lower maintenance.
Use Cases: The TM‑RAT‑750 is typically installed on offshore support vessels that must hold position beside rigs, cruise ships docking in congested harbours, and large cargo carriers requiring tight maneuvering during port entry. Its retractable feature allows the vessel to cruise efficiently while still providing powerful thrust when needed for DP or low‑speed manoeuvring.
Datasheet
TM-RAT-750 stern unverified
· 750.0 kW · retractable azimuth thruster
Power (kW)
750
Thrust (kN)
97.5
Diameter (mm)
925
Type
retractable
Location
stern
Strengths
  • High thrust output (97.5 kN) relative to power rating, enabling strong manoeuvring forces
  • Retractable design reduces hull resistance when the unit is stowed, improving fuel efficiency
  • 360° rotatable nozzle provides omni‑directional thrust for fine positioning and rapid course changes
  • Integrated control electronics compatible with most DP and bridge navigation systems
  • Robust 925 mm propeller diameter suitable for large commercial vessels
Weaknesses
  • Complex mechanical arrangement (retract/extend mechanism) increases maintenance workload
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power
  • Requires dedicated space in the stern tube and structural reinforcement
  • Power demand (750 kW) may necessitate upgrades to ship's electrical distribution system
  • Potential for hydraulic or actuator failure if not inspected regularly
Typical Vessels: Very Large Crude Carrier (VLCC)Ultra‑Large Container Ship (ULCS)Cruise linerOffshore supply vesselFloating production storage and offloading unit (FPSO)
Decision Guide: Choose if: you need high‑power, low‑drag thrust for DP or tight port manoeuvring on large vessels and can accommodate the retractable system. Avoid if: budget constraints limit upfront cost, space for a stern tube is insufficient, or you prefer simpler fixed thrusters with lower maintenance.
Use Cases: The TM‑RAT‑750 is typically deployed on deep‑draft ships that require dynamic positioning during offshore operations, tight berthing in congested ports, and rapid emergency manoeuvres. Its retractable feature allows the vessel to cruise efficiently while still providing powerful thrust when needed for precise control.
Datasheet
TM-RAT-1000 bow unverified
· 1000.0 kW · retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
130.0
Diameter (mm)
1100
Type
retractable
Location
bow
Strengths
  • High power (1,000 kW) and thrust (130 kN) for rapid low‑speed manoeuvring
  • Retractable design reduces hull resistance and fuel consumption when the thruster is not needed
  • Full 360° rotation gives excellent directional control for docking and DP operations
  • Relatively compact diameter (1.1 m) fits many modern bow tunnel arrangements
Weaknesses
  • Complex retractable mechanism increases installation and maintenance effort
  • Higher initial cost compared with fixed‑pitch bow thrusters of similar power
  • Requires sufficient hull space for the retraction tube and hydraulic/electrical services
  • Limited field data on long‑term reliability (no recorded failures in catalog)
Typical Vessels: Cruise shipLNG carrierOffshore supply vesselContainer shipLarge tanker
Decision Guide: Choose if you need a high‑thrust bow thruster that can be retracted to minimise drag on large vessels with dynamic positioning or tight‑harbor requirements. Avoid if budget constraints, limited hull space for the retraction system, or preference for simpler fixed‑type thrusters.
Use Cases: Commonly installed on vessels that require strong low‑speed manoeuvring and DP capability, such as offshore support ships entering congested ports, large cruise liners docking in narrow berths, or LNG carriers needing precise positioning during loading/unloading.
Datasheet
TM-RAT-1000 stern unverified
· 1000.0 kW · retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
130.0
Diameter (mm)
1100
Type
retractable
Location
stern
Strengths
  • High thrust (≈130 kN) from a relatively compact 1 MW unit
  • Full 360° vectoring provides excellent maneuverability and DP capability
  • Retractable design reduces hydrodynamic drag when the thruster is not needed
  • Protects the propeller and nozzle from fouling and impact while retracted
  • Can be integrated with existing ship control systems for automated positioning
Weaknesses
  • Complex retractable mechanism increases installation and maintenance effort
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power
  • Requires hull penetration; potential leak points must be carefully sealed
  • Space‑intensive retraction housing may limit use on vessels with tight aft arrangements
  • Power demand (≈1 MW) can impact overall ship electrical load and fuel consumption
Typical Vessels: Offshore supply vesselPlatform support vesselDP‑class tugCruise linerLNG carrier with dynamic positioning
Decision Guide: Choose if the vessel needs high maneuverability, DP capability, or wants to minimise drag by retracting the thruster when cruising. Avoid if budget is tight, hull space aft is limited, or a simpler fixed tunnel thruster meets the operational profile.
Use Cases: Commonly installed on offshore supply ships for station‑keeping beside rigs, cruise ships for precise berth handling in congested ports, and DP‑tugs that require rapid thrust changes while keeping drag low during transit.
Datasheet
TM-RAT-1500 bow unverified
· 1500.0 kW · Retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
195.0
Diameter (mm)
1450
Type
retractable
Location
bow
Strengths
  • Very high thrust (195 kN) suitable for large vessels and DP operations
  • Retractable design reduces hull resistance when the thruster is not in use
  • Large propeller diameter improves efficiency at low speeds
  • Integrated control system compatible with most bridge consoles
  • Robust construction rated for continuous high‑power operation
Weaknesses
  • Large physical envelope (1.45 m diameter) limits installation on smaller hulls
  • Higher power demand (1 500 kW) increases fuel consumption and electrical load
  • Retractable mechanism adds mechanical complexity and maintenance requirements
  • Initial procurement cost is relatively high compared with fixed thrusters of similar rating
  • Spare‑part availability may be limited to the manufacturer’s network
Typical Vessels: Ultra‑large container shipLNG carrierCrude oil tanker (VLCC)Cruise linerOffshore supply vessel
Decision Guide: Choose if the vessel requires very high bow thrust for DP or tight‑port maneuvering and has sufficient hull space to accommodate a 1.45 m retractable unit. Avoid if the ship is size‑restricted, power‑limited, or if budget constraints make a simpler fixed thruster more appropriate.
Use Cases: The TM‑RAT‑1500 is typically installed on large ocean‑going vessels that need precise low‑speed control for berthing, unberthing, and dynamic positioning in confined waterways. It is also used on offshore platforms and cruise ships where drag reduction during transit is a priority.
Datasheet
TM-RAT-1500 stern unverified
· 1500.0 kW · retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
195.0
Diameter (mm)
1450
Type
retractable
Location
stern
Strengths
  • High thrust output (195 kN) for its power rating, supporting DP operations
  • Retractable design reduces hull resistance during cruising, improving fuel efficiency
  • 360° thrust vectoring provides excellent maneuverability in tight ports and offshore work
  • Compact tunnel diameter (1.45 m) fits medium‑size vessels without excessive hull enlargement
  • Integrated control interface compatible with most ship bridge systems
Weaknesses
  • Complex retractable mechanism adds to installation cost and maintenance requirements
  • Requires a dedicated stern tunnel; not suitable for vessels lacking sufficient beam or structural allowance
  • Higher initial capital expense compared with fixed thrusters of similar power
  • Potential reliability concerns if the retract system is not regularly serviced
  • Limited thrust when retracted (essentially zero), so cannot be used for low‑speed propulsion
Typical Vessels: Offshore supply vesselPlatform support vesselDynamic positioning vessel (DP2/DP3)Anchor handling tug supply (AHTS) shipCruise ship or ferry requiring enhanced maneuverability
Decision Guide: Choose if the vessel needs high‑precision manoeuvring, dynamic positioning capability and wants to minimise cruising drag by retracting the thruster. Avoid if hull space is limited, budget constraints preclude a retractable system, or the operational profile does not require frequent low‑speed thrust vectoring.
Use Cases: Commonly installed on offshore support vessels for station‑keeping during drilling operations, on cruise ships for tight docking maneuvers, and on tugs that need rapid directional changes while maintaining low resistance when cruising.
Datasheet
TM-RAT-2000 bow unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
260.0
Diameter (mm)
1800
Type
retractable
Location
bow
Strengths
  • Very high thrust (260 kN) suitable for large vessels and DP operations
  • Retractable design reduces drag when the vessel is underway, improving fuel efficiency
  • Large 1.8 m propeller diameter provides efficient thrust at low RPMs
  • Integrated control interface compatible with most ship bridge systems
  • Robust construction designed for harsh offshore environments
Weaknesses
  • Complex mechanical and hydraulic systems increase maintenance requirements
  • Requires significant hull penetration and internal space in the bow section
  • Higher initial capital cost compared with fixed‑pitch bow thrusters of similar power
  • Retract/extend cycles can lead to wear on sealing surfaces if not properly serviced
  • Limited availability of spare parts outside Thrustmaster Marine’s service network
Typical Vessels: Offshore supply vesselDP‑class platform support shipCruise linerLarge container or bulk carrier requiring enhanced port maneuverabilityLNG/LPG carrier with dynamic positioning needs
Decision Guide: Choose if you need a high‑thrust, retractable bow thruster for DP or tight‑port operations and are willing to invest in the associated maintenance infrastructure. Avoid if budget constraints favor simpler fixed‑pitch units, or if hull space for a retractable system is limited.
Use Cases: The TM‑RAT‑2000 is typically installed on vessels that must hold position during offshore loading/unloading, perform precise docking in confined harbours, or require reduced resistance while cruising. It is common on DP‑2/DP‑3 support ships and large passenger vessels where maneuverability and fuel savings are critical.
Datasheet
TM-RAT-2000 stern unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
260.0
Diameter (mm)
1800
Type
retractable
Location
stern
Strengths
  • High thrust (260 kN) for a 2 MW unit enables strong maneuverability and DP capability
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency
  • Full 360° azimuth steering gives precise positioning and low‑speed handling
  • Robust construction suitable for harsh offshore environments
  • Integrated control interface compatible with most ship automation systems
Weaknesses
  • Complex mechanical retraction system increases maintenance requirements
  • Higher upfront cost compared with fixed tunnel thrusters of similar power
  • Requires dedicated hull space and structural reinforcement at the stern
  • Potential for cavitation if operated continuously at high RPM in shallow water
  • Weight and installation time are greater than simpler ducted propeller solutions
Typical Vessels: Offshore Support Vessel (OSV)Drillship / FPSOLNG carrier with DP requirementsCruise ship requiring fine maneuvering in portsLarge research or survey vessel
Decision Guide: Choose if the vessel needs high‑precision dynamic positioning, frequent low‑speed maneuvers, and can accommodate a retractable unit to gain transit efficiency. Avoid if budget constraints dominate, hull space is limited, or the operational profile does not demand 360° thrust vectoring.
Use Cases: The TM‑RAT‑2000 is typically installed on DP2/DP3 offshore vessels for station‑keeping during drilling or loading operations, on cruise ships for tight port entries, and on LNG carriers that require precise maneuvering in confined terminals. It also serves as an emergency thrust source for large ships needing redundancy.
Datasheet
TM-RAT-2500 bow unverified
· 2500.0 kW · retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
325.0
Diameter (mm)
2150
Type
retractable
Location
bow
Strengths
  • High thrust (325 kN) suitable for large vessels and DP operations
  • Full 360° rotation gives excellent maneuverability
  • Retractable design reduces hydrodynamic drag during transit
  • Compact footprint compared with fixed tunnel thrusters of similar power
  • Facilitates dynamic positioning and precise station‑keeping
Weaknesses
  • Complex mechanical retraction system increases maintenance requirements
  • Higher initial cost than conventional fixed thrusters
  • Requires dedicated hull space for the retraction well
  • Potential for cavitation at high thrust levels if not properly sized to vessel speed
  • Weight and structural reinforcement needs may impact overall ship design
Typical Vessels: Offshore supply vesselsDP‑class tankers (e.g., LNG carriers)Cruise shipsHeavy lift / RoRo vesselsResearch vessels
Decision Guide: Choose if the vessel needs high maneuverability, dynamic positioning or frequent low‑speed operations where drag reduction is valuable. Avoid if budget constraints, limited hull space for a retraction well, or if a simpler fixed thruster meets the operational profile.
Use Cases: Commonly installed on offshore support ships to hold position beside drilling rigs, on large cruise liners for tight harbor turns, and on DP‑equipped tankers for precise maneuvering during loading/unloading. The retractable feature is leveraged when the vessel cruises at higher speeds to minimise resistance.
Datasheet
TM-RAT-2500 stern unverified
· 2500.0 kW · retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
325.0
Diameter (mm)
2150
Type
retractable
Location
stern
Strengths
  • High power‑to‑thrust ratio (2 500 kW → 325 kN) suitable for DP‑class vessels
  • Retractable design reduces hull resistance when the unit is not in use
  • 360° thrust vectoring provides excellent low‑speed maneuverability and station‑keeping
  • Large propeller diameter (2.15 m) improves efficiency at lower RPMs
Weaknesses
  • Large physical envelope (2.15 m diameter) may limit installation on smaller hulls
  • Retractable mechanism adds mechanical complexity and maintenance requirements
  • High power rating implies significant electrical load and associated cabling costs
  • Limited published data; verification of performance curves may be required
Typical Vessels: Offshore supply vesselDynamic positioning platformCruise ship (stern maneuvering)LNG carrier with DP requirementsLarge tanker requiring enhanced stern control
Decision Guide: Choose if: you need a high‑thrust, retractable stern thruster for DP operations or tight docking maneuvers and have sufficient hull space for the unit. Avoid if: budget constraints, limited installation envelope, or lower thrust requirements make a fixed‑pitch or smaller thruster more appropriate.
Use Cases: Commonly installed on offshore support vessels and cruise ships to provide precise stern steering during dynamic positioning, low‑speed docking, and tug assistance while allowing the propeller to be retracted for cruising to minimise drag.
Datasheet
TM-RAT-3000 bow unverified
· 3000.0 kW · retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
390.0
Diameter (mm)
2500
Type
retractable
Location
bow
Strengths
  • Very high thrust (≈390 kN) suitable for large vessels requiring strong lateral forces
  • Retractable design minimizes hull resistance and drag when the unit is stowed
  • Full‑circle azimuth capability gives excellent maneuverability in confined ports
  • Integrated hydraulic or electric drive options allow flexible installation on new builds or retrofits
  • Compact 2.5 m propeller diameter fits within typical bow tunnel dimensions for vessels of this power class
Weaknesses
  • Complex retractable mechanism adds maintenance requirements compared with fixed thrusters
  • Higher initial capital cost due to hydraulic/electromechanical actuation and sealing systems
  • Requires sufficient hull space in the bow to accommodate retraction housing and guide rails
  • Potential for water ingress if seals degrade; regular inspection is mandatory
Typical Vessels: Aframax tankerPanamax container shipLarge bulk carrier (Handymax/Handysize)Cruise shipOffshore supply vesselLNG/LPG carrier
Decision Guide: Choose if you need maximum bow thrust for a vessel of 30 000‑80 000 gt, require the ability to retract the unit to reduce drag during cruising, and have budget for higher upfront cost and maintenance. Avoid if hull space is limited, the vessel operates primarily in open water where high thrust is unnecessary, or you prefer a simpler fixed thruster with lower lifecycle costs.
Use Cases: The TM‑RAT‑3000 is typically installed on large commercial ships that must perform tight port turns, berth without tug assistance, or maintain position during offshore operations. It is also used on cruise liners for precise docking and on LNG carriers where dynamic positioning is required during loading/unloading at terminals.
Datasheet
TM-RAT-3000 stern unverified
· 3000.0 kW · retractable azimuth thruster
Power (kW)
3000
Thrust (kN)
390.0
Diameter (mm)
2500
Type
retractable
Location
stern
Strengths
  • High power‑to‑thrust ratio (3000 kW → 390 kN) suitable for large vessels
  • Retractable design reduces hull resistance when not in use, improving fuel efficiency
  • 360° rotation gives excellent maneuverability and DP capability
  • Integrated control electronics compatible with most DP systems
  • Compact pod diameter (2.5 m) fits into moderate‑size stern tunnels
Weaknesses
  • Complex hydraulic/mechanical system increases maintenance requirements
  • Higher initial capital cost compared with fixed tunnel thrusters of similar power
  • Retractable mechanism adds weight and occupies valuable hull space
  • Requires dedicated control room integration and trained operators
  • Potential for seal wear in the retractable housing, leading to periodic over‑hauls
Typical Vessels: Offshore Supply Vessel (OSV)Dynamic Positioning (DP) Platform Support ShipLNG CarrierCruise ShipLarge Bulk Carrier with DP requirement
Decision Guide: Choose if the vessel needs high thrust for DP or tight‑berth manoeuvring and benefits from reduced drag when the thruster is retracted. Avoid if budget constraints limit capital spend, maintenance resources are scarce, or a simpler fixed tunnel thruster meets the maneuvering requirements.
Use Cases: The TM‑RAT‑3000 is typically installed on DP‑class offshore support vessels, LNG carriers and cruise ships where precise station‑keeping and low‑drag operation are critical. It is also used on large bulk carriers that require enhanced manoeuvrability in confined ports while maintaining fuel efficiency during normal cruising.
Datasheet

ABB Azipod

14
Azipod CZ Thruster 500kW bow unverified
· 500.0 kW · retractable azimuth thruster
Power (kW)
500
Thrust (kN)
70.0
Diameter (mm)
800
Type
azimuth
Location
bow
Strengths
  • Full 360° thrust vectoring provides superior low‑speed maneuverability and dynamic positioning capability.
  • Retractable design reduces drag and improves fuel efficiency when the thruster is not in use.
  • Integrated electric drive eliminates gearbox, resulting in lower vibration, noise and maintenance on moving parts.
  • Compact footprint frees up internal space compared with conventional tunnel thrusters.
  • Proven ABB Azipod control system offers fast response and easy integration with ship automation.
Weaknesses
  • Higher capital cost than traditional fixed‑pitch tunnel or ducted thrusters of similar power.
  • Requires dedicated high‑power electric supply and sophisticated control electronics, increasing installation complexity.
  • Pod seal and bearing maintenance can be more specialised and costly over the life‑cycle.
  • Maximum thrust (70 kN) may be insufficient for very large vessels requiring higher bow‑side pulling force.
  • Retractable mechanism adds mechanical components that must be inspected regularly to avoid failure.
Typical Vessels: Offshore Supply VesselDynamic Positioning PlatformCruise Ship (bow thruster)LNG CarrierContainer Ship with DP
Certifications: DNV GL ClassificationABS ClassificationLloyd's Register Classification
Decision Guide: Choose if: you need precise low‑speed handling, dynamic positioning or frequent docking in confined ports and want drag reduction when the thruster is idle. Avoid if: budget constraints dominate, the vessel requires thrust well above 70 kN at the bow, or the operator prefers a simpler mechanically driven tunnel thruster.
Use Cases: Commonly installed on offshore support vessels for DP operations, cruise ships to aid berthing and departure, LNG carriers that require tight maneuvering in terminals, and container ships equipped with DP systems for safe cargo handling near shore facilities.
Datasheet
Azipod CZ Thruster 500kW stern unverified
· 500.0 kW · Retractable azimuth electric pod thruster
Power (kW)
500
Thrust (kN)
70.0
Diameter (mm)
800
Type
azimuth
Location
stern
Strengths
  • Full 360° rotation gives superior manoeuvrability and docking precision
  • Pod‑integrated motor eliminates shaft line, reducing vibration and noise
  • Retractable design lowers hull resistance during cruising, improving fuel efficiency
  • Compact footprint frees internal space compared with conventional shaft lines
  • High thrust‑to‑power ratio (≈70 kN at 500 kW) for its size
Weaknesses
  • Higher upfront cost and lifecycle cost than a conventional fixed propeller + rudder
  • Maintenance requires dry‑docking to access the internal motor and bearings
  • Limited maximum thrust compared with larger Azipod models, unsuitable for high‑speed or heavy‑towing applications
  • Requires dedicated electric power distribution and control system integration
  • Potential cavitation at higher advance speeds if not properly sized
Typical Vessels: Ro‑Pax ferrySmall cruise shipOffshore supply vesselResearch / survey vesselContainer feeder
Certifications: DNVIMO Type Approval
Decision Guide: Choose if the vessel needs excellent low‑speed manoeuvrability, dynamic positioning capability and wants to minimise cruising resistance with a retractable unit. Avoid if budget constraints are tight, higher thrust levels are required, or the ship operates primarily at high speeds where conventional shafts are more economical.
Use Cases: Commonly installed as a stern thruster on ferries and small cruise liners for docking assistance, on offshore support vessels for dynamic positioning during offshore operations, and on research ships to enable precise station‑keeping in confined waters. The retractable feature is exploited on vessels that spend most of their time cruising but require occasional high‑precision manoeuvring.
Datasheet
Azipod CZ Thruster 750kW bow unverified
· 750.0 kW · retractable azimuth thruster
Power (kW)
750
Thrust (kN)
105.0
Diameter (mm)
950
Type
azimuth
Location
bow
Strengths
  • Full 360° steering gives excellent low‑speed maneuverability and dynamic positioning capability.
  • Retractable design reduces hydrodynamic resistance when not in use, improving fuel efficiency on long passages.
  • Integrated electric drive eliminates the need for a separate gearbox, lowering mechanical losses and noise.
  • Compact installation footprint frees up valuable hull space compared with conventional shaft lines.
  • Proven ABB Azipod control system offers precise thrust vectoring and easy integration with ship automation.
Weaknesses
  • Higher capital cost than conventional fixed bow thrusters of similar power.
  • Retractable mechanism adds complexity and requires specialised maintenance procedures.
  • Maximum thrust (≈105 kN) may be insufficient for very large vessels or extreme weather DP operations.
  • Requires dedicated high‑power electric supply and cooling infrastructure on board.
  • Redundancy is limited to the single unit; failure can affect both propulsion and maneuvering functions.
Typical Vessels: Cruise shipsFerriesOffshore supply vesselsLNG carriers (mid‑size)Research vessels
Decision Guide: Choose if: you need high maneuverability and the ability to retract the thruster for cruising efficiency, especially on vessels that operate frequently in ports or require dynamic positioning. Avoid if: budget constraints dominate, thrust requirements exceed ~105 kN, or you prefer a simpler, lower‑maintenance fixed thruster solution.
Use Cases: Commonly installed as a bow thruster on cruise liners and ferries to aid docking, undocking and low‑speed navigation in confined waters. Also used on offshore supply ships for DP‑1/DP‑2 operations where the ability to hide the thruster during transit reduces drag and fuel consumption.
Datasheet
Azipod CZ Thruster 750kW stern unverified
· 750.0 kW · retractable azimuth thruster
Power (kW)
750
Thrust (kN)
105.0
Diameter (mm)
950
Type
azimuth
Location
stern
Strengths
  • Full 360° thrust vectoring gives exceptional manoeuvrability for docking and low‑speed operations.
  • Retractable design reduces hydrodynamic resistance when the unit is not needed, improving fuel efficiency at cruise speed.
  • Integrated electric motor eliminates the need for a conventional shaft line, reducing vibration and noise in passenger areas.
  • Compact footprint frees up internal hull space compared with traditional propeller/shaft arrangements.
  • Proven ABB control system supports dynamic positioning and automated docking procedures.
Weaknesses
  • Higher capital cost than a conventional fixed propeller or tunnel thruster of similar power.
  • Maintenance of the pod bearing, motor seals and retracting mechanism is more specialised.
  • Maximum thrust (105 kN) may be insufficient for very large vessels requiring high bollard pull.
  • Requires dedicated electrical power distribution and control integration on board.
  • Potential cavitation at full‑power operation in shallow water if not properly sized.
Typical Vessels: Ro‑Pax ferryMid‑size cruise shipOffshore supply vesselCoastal tankerLNG bunkering or service vessel
Certifications: DNV GLABSLloyd's Register
Decision Guide: Choose if you need high‑precision manoeuvring, want to reduce drag during transit, and have the electrical infrastructure for a podded motor. Avoid if budget constraints dominate, the vessel requires very high bollard pull, or you lack access to specialised maintenance facilities.
Use Cases: The Azipod CZ is commonly installed on ferries and cruise ships for rapid docking and reverse‑free manoeuvring, on offshore support vessels for dynamic positioning, and on coastal tankers where a retractable thruster can be stowed to improve cruising efficiency while still providing reliable low‑speed thrust when needed.
Datasheet
Azipod CZ Thruster 1000kW bow unverified
· 1000.0 kW · retractable azimuth thruster
Power (kW)
1000
Thrust (kN)
140.0
Diameter (mm)
1100
Type
azimuth
Location
bow
Strengths
  • Full 360° thrust vectoring gives superior low‑speed manoeuvrability and DP capability.
  • Retractable design eliminates hydrodynamic resistance during transit, improving fuel efficiency.
  • Integrated electric motor removes the need for a gearbox, reducing vibration and maintenance points.
  • Compact footprint compared with conventional tunnel thrusters of similar power.
  • Proven ABB Azipod control system with advanced fault diagnostics.
Weaknesses
  • Higher upfront capital cost than fixed‑pitch tunnel thrusters of comparable thrust.
  • Requires hull modifications for the retractable tunnel and associated sealing systems.
  • Maintenance of pod seals and hydraulic retraction mechanisms can be more complex.
  • Maximum continuous thrust (≈140 kN) may be insufficient for very large vessels or extreme weather DP operations.
  • Dependence on ship‑board electrical power distribution; requires robust power management.
Typical Vessels: Offshore supply vesselPlatform support vesselDP‑class research vesselSmall cruise shipLNG carrier (bow thruster application)Container feeder
Certifications: DNV GL ClassificationABS ClassificationIMO Type Approval
Decision Guide: Choose if the vessel needs high‑precision low‑speed manoeuvring, dynamic positioning and wants to minimise drag during cruising. Avoid if budget constraints dominate, thrust requirements exceed ~140 kN, or hull form cannot accommodate a retractable tunnel without major redesign.
Use Cases: Commonly installed as a bow thruster on offshore supply vessels for station‑keeping while loading rigs, on DP‑2/DP‑3 research ships for precise positioning, and on smaller cruise or LNG carriers to aid berthing in confined ports where rapid thrust direction changes are required.
Datasheet
Azipod CZ Thruster 1000kW stern unverified
· 1000.0 kW · Retractable azimuth electric pod
Power (kW)
1000
Thrust (kN)
140.0
Diameter (mm)
1100
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (140 kN at 1000 kW) for excellent maneuverability
  • Full 360° rotation eliminates need for rudders and stern thrusters, simplifying hull design
  • Retractable design reduces hydrodynamic resistance during cruising, improving fuel efficiency
  • Integrated electric motor offers low vibration and noise, beneficial for passenger comfort
  • Well suited for dynamic positioning (DP) applications on offshore and ferry vessels
Weaknesses
  • Higher capital cost compared with conventional fixed propeller + rudder arrangements
  • Maintenance requires specialised knowledge of pod‑integrated electric motors and seals
  • Efficiency drops off‑design when operating at speeds far from the design point
  • Installation demands hull reinforcement and space for retraction mechanisms
  • Limited availability of spare parts in remote ports may affect turnaround time
Typical Vessels: FerryOffshore supply vesselWorkboat / tug‑type DP vesselSmall cruise shipIce‑class support vessel
Certifications: ABSDNVGL
Decision Guide: Choose this Azipod CZ when you need superior maneuverability, DP capability and the ability to retract the thruster to lower cruising resistance – especially on vessels with limited stern space or where passenger comfort (low noise/vibration) is critical. Avoid it if budget constraints dominate, the vessel operates primarily at a single speed far from the pod’s optimum efficiency range, or you lack access to specialised maintenance facilities.
Use Cases: The thruster is commonly installed on ferries docking in congested harbours, offshore supply vessels that must hold position near rigs, and small cruise ships requiring quiet operation while still needing tight turning circles. Its retractable feature is also valued on ice‑support vessels where reduced drag improves fuel consumption during long transits.
Datasheet
Azipod CZ Thruster 1500kW bow unverified
· 1500.0 kW · retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
210.0
Diameter (mm)
1400
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈0.14 kN/kW) for a compact unit
  • Retractable design reduces hull resistance when not in use, improving fuel efficiency
  • Full 360° rotation gives excellent maneuverability and DP capability
  • Electric drive eliminates long shaft lines and gearboxes, lowering mechanical losses
  • Relatively small diameter (1.4 m) fits into tight bow spaces
Weaknesses
  • Higher capital cost compared with conventional fixed‑pitch bow thrusters
  • Requires dedicated electric power distribution and sophisticated control software
  • Pod seal and bearing maintenance can be more complex than for simple ducted propellers
  • Limited redundancy – loss of the unit removes both thrust and steering capability at that location
  • Retractable mechanism adds moving parts that need regular inspection
Typical Vessels: Platform Supply Vessel (PSV)Anchor Handling Tug Supply (AHTS)Offshore Support / DP‑class vesselCruise ship or ferry with high maneuverability requirementsLNG carrier or chemical tanker using bow thrusters for docking
Decision Guide: Choose if you need a powerful, 360° steerable bow thruster that can be retracted to minimise drag and support dynamic positioning. Ideal for offshore vessels where maneuverability outweighs upfront cost. Avoid if the vessel lacks an integrated electric power system, budget constraints are tight, or redundancy through multiple conventional thrusters is preferred.
Use Cases: Commonly installed on offshore supply ships for precise station‑keeping during cargo transfer, on cruise liners to aid docking in confined ports, and on DP‑class tankers where a retractable bow unit reduces resistance while cruising but provides full thrust when maneuvering.
Datasheet
Azipod CZ Thruster 1500kW stern unverified
· 1500.0 kW · retractable electric azimuth thruster
Power (kW)
1500
Thrust (kN)
210.0
Diameter (mm)
1400
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (≈210 kN at 1500 kW) for excellent maneuverability
  • Full 360° vectoring eliminates the need for separate bow and stern rudders
  • Retractable design reduces hull resistance during straight‑line cruising
  • Electric drive lowers vibration, noise and mechanical losses compared with shaft‑driven systems
  • Compact footprint frees up internal volume for cargo or accommodation
Weaknesses
  • Higher capital cost than conventional fixed propellers or rudders
  • Requires a robust shipboard electrical power system and skilled control‑room operators
  • Maintenance of pod seals, bearings and electric motor can be more complex
  • Potential cavitation at high thrust settings if not properly sized for hull form
  • Limited redundancy if the single pod fails; often paired with a secondary propulsion unit
Typical Vessels: FerryOffshore Support Vessel (OSV)Small cruise ship / river cruise vesselResearch or survey vesselDP‑2 tug or workboat
Certifications: IMO Type Approval
Decision Guide: Choose if you need precise, 360° thrust for dynamic positioning, tight harbor maneuvers, or ice navigation and want drag reduction when cruising. Avoid if budget constraints dominate, the vessel lacks sufficient electrical power capacity, or redundancy can only be achieved with multiple conventional propellers.
Use Cases: The Azipod CZ is commonly installed on vessels that require high maneuverability such as ferries docking frequently, offshore support ships maintaining DP positions, and small cruise vessels navigating constrained ports. Its retractable feature is valuable for vessels that spend long periods on straight‑line voyages but still need occasional thrust vectoring.
Datasheet
Azipod CZ Thruster 2000kW bow unverified
· 2000.0 kW · Retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
280.0
Diameter (mm)
1700
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈280 kN from 2 MW) for strong maneuvering and DP capability
  • Full 360° rotation eliminates the need for separate rudders or steering gear
  • Retractable installation reduces drag and protects the unit when cruising
  • Compact pod layout frees internal hull space compared with conventional tunnel thrusters
  • Electric drive offers low vibration, lower noise and easier integration with ship‑board power systems
Weaknesses
  • Higher capital cost than traditional fixed tunnel or ducted thrusters
  • Complex maintenance of the electric motor and retractable sealing mechanism
  • Requires compatible hull form and structural reinforcement at the bow
  • Integration demands sophisticated control software and power management
  • Potential for seal wear on the retractable joint, increasing inspection intervals
Typical Vessels: Offshore supply vesselsCruise shipsLNG carriersContainer ships with DP requirementsResearch / survey vessels
Certifications: IMO Type Approval (Resolution MSC.267(84))
Decision Guide: Choose if the vessel needs high‑power, all‑direction thrust for dynamic positioning or tight port manoeuvring and can accommodate the higher upfront cost and maintenance regime of an electric pod. Avoid if a conventional tunnel thruster provides sufficient performance at lower cost, or if hull design cannot support a bow‑mounted retractable unit.
Use Cases: The Azipod CZ 2000 kW is typically installed on large vessels that require precise station‑keeping during offshore operations, rapid turning in confined ports, and reduced resistance while underway. It is common on DP‑class supply ships, cruise liners needing tight docking control, and LNG carriers where bow thrust aids ice navigation or low‑speed manoeuvring.
Datasheet
Azipod CZ Thruster 2000kW stern unverified
· 2000.0 kW · retractable azimuth thruster
Power (kW)
2000
Thrust (kN)
280.0
Diameter (mm)
1700
Type
azimuth
Location
stern
Strengths
  • Full 360° steering eliminates need for separate rudders or bow thrusters
  • Retractable design reduces drag when the pod is not in use, improving fuel efficiency
  • High thrust‑to‑power ratio (≈0.14 kN/kW) gives excellent maneuverability for large vessels
  • Electric drive removes mechanical transmission losses and lowers vibration/noise levels
  • Integrated with ship’s power system, enabling dynamic positioning and redundancy
Weaknesses
  • Higher capital cost compared with conventional shaft‑line thrusters
  • Complex control and monitoring systems require specialised crew training
  • Maintenance of sealed electric motor and pod bearings can be more demanding
  • Hull penetration for the retractable mechanism may affect structural integrity if not designed correctly
  • Cavitation risk at very high thrust settings, especially in shallow water
Typical Vessels: Cruise shipsOffshore supply vessels (OSV)LNG carriers with DP requirementsFerriesNaval auxiliary ships
Certifications: IMO D‑2USCG Type ApprovalDNV GL Type Approved
Decision Guide: Choose if the vessel needs high maneuverability, dynamic positioning or a retractable thruster to minimise drag during cruise. Ideal for ships with limited hull space where a conventional shaft line would be impractical. Avoid if budget constraints dominate, the vessel is small (<5 000 gt), or crew expertise in electric pod systems is lacking.
Use Cases: The Azipod CZ 2000 kW stern unit is commonly installed on cruise ships for precise docking and undocking, on offshore supply vessels to provide DP‑class thrust while keeping drag low during transit, and as a backup maneuvering thruster on LNG carriers where redundancy and space saving are critical.
Datasheet
Azipod CZ Thruster 2500kW bow unverified
· 2500.0 kW · retractable azimuth thruster
Power (kW)
2500
Thrust (kN)
350.0
Diameter (mm)
2000
Type
azimuth
Location
bow
Strengths
  • Retractable design reduces hydrodynamic resistance during transit, improving fuel efficiency.
  • Integrated electric motor eliminates shaft line, lowering vibration and noise levels.
  • Full 360° thrust vectoring gives superior maneuverability for docking and dynamic positioning.
  • High thrust‑to‑power ratio (≈350 kN at 2500 kW) suitable for large vessels requiring strong bow assistance.
  • Compact installation frees up hull space compared with conventional tunnel thrusters.
Weaknesses
  • Higher initial capital cost than conventional fixed tunnel thrusters.
  • Maintenance requires access to the pod interior and specialised electrical expertise.
  • Retractable mechanism adds mechanical complexity and potential failure points.
  • Requires a robust ship‑board electric power distribution system (high‑voltage cabling).
  • Limited retro‑fit applicability on vessels without sufficient hull volume for retraction.
Typical Vessels: Cruise shipsLNG carriersOffshore supply vesselsFPSOsLarge container ships with high maneuverability requirements
Decision Guide: Choose if the vessel needs strong bow thrust combined with reduced drag during cruising, such as cruise liners or offshore support ships that perform frequent docking and dynamic positioning. Avoid if budget constraints dominate, the ship lacks space for a retractable pod, or the operator prefers simpler, lower‑cost fixed tunnel thrusters.
Use Cases: The Azipod CZ is typically deployed on new builds where designers integrate the retractable pod into the hull to provide high‑power bow assistance for port entry/exit, tight berth handling, and DP operations while allowing the pod to be retracted during open‑water sailing to minimise resistance.
Datasheet
Azipod CZ Thruster 2500kW stern unverified
· 2500.0 kW · Retractable azimuth pod
Power (kW)
2500
Thrust (kN)
350.0
Diameter (mm)
2000
Type
azimuth
Location
stern
Strengths
  • Full 360° thrust vectoring gives superior maneuverability and DP capability.
  • Retractable design reduces hydrodynamic resistance during cruising, improving fuel efficiency.
  • Integrated electric motor eliminates the need for a traditional shaft line, lowering vibration and noise.
  • High power‑to‑size ratio (2500 kW in a 2 m diameter pod) suits vessels with limited hull space.
  • Proven ABB Azipod heritage provides extensive operational experience and support network.
Weaknesses
  • Higher upfront capital cost compared with conventional shaft‑driven thrusters.
  • Complex retraction mechanism adds maintenance tasks and potential failure points.
  • Spare parts and specialized service may be less readily available in remote ports.
  • Weight of the pod and retraction system can impact payload calculations for smaller vessels.
  • Efficiency at very low speeds can be lower than that of dedicated tunnel or ducted thrusters.
Typical Vessels: Offshore supply vesselLNG carrierCruise shipContainer ship (DP‑enabled)Bulk carrier with high maneuverability requirements
Decision Guide: Choose if you need maximum steering flexibility, the ability to retract for cruise efficiency, and DP capability on a vessel where hull space is at a premium. Avoid if budget constraints dominate, the operating profile involves prolonged low‑speed thrust where conventional ducted thrusters are more efficient, or if spare‑part logistics for electric pods are problematic.
Use Cases: The Azipod CZ 2500 kW is commonly installed on offshore support vessels that must hold position in harsh seas, on LNG carriers that benefit from reduced resistance during long voyages, and on cruise ships requiring precise docking maneuvers in congested ports. Its retractable feature also makes it attractive for vessels operating both at high speed (retracted) and low speed with DP (deployed).
Datasheet
Azipod CZ Thruster 3000kW bow unverified
· 3000.0 kW · retractable electric azimuth thruster
Power (kW)
3000
Thrust (kN)
420.0
Diameter (mm)
2300
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio with 420 kN at 3000 kW
  • Retractable design lowers drag and improves fuel efficiency when the thruster is not needed
  • Full 360° rotation provides precise maneuvering and DP capability
  • Direct‑drive electric motor eliminates gearboxes, reducing vibration and maintenance
  • Compact installation suitable for bow locations on DP vessels
Weaknesses
  • Higher capital cost compared with conventional tunnel thrusters
  • Complex retractable mechanism adds to maintenance workload and requires periodic inspection
  • Requires dedicated high‑power electrical supply and cooling infrastructure
  • Limited thrust for very large tankers or cruise ships; may need multiple units
  • Installation space for retraction housing can be restrictive on smaller hulls
Typical Vessels: Offshore Support Vessel (OSV)Platform Supply Vessel (PSV)Anchor Handling Tug Supply (AHTS)DP‑class LNG carrierCruise ship with advanced maneuvering requirements
Certifications: IMO D-2DNV
Decision Guide: Choose if you need high thrust and precise azimuth control for dynamic positioning, want the ability to retract the thruster to reduce drag during transit, and have sufficient electrical power capacity. Avoid if budget is tight, a simpler conventional tunnel thruster meets your maneuverability needs, or hull form cannot accommodate the retraction housing.
Use Cases: Typically installed on DP‑capable offshore vessels for station‑keeping near rigs, on large cruise ships to aid port entry and exit while allowing the unit to be stowed during cruising, and on LNG carriers where bow thrust is needed for tight berthing but drag reduction is critical for fuel efficiency.
Datasheet
Azipod CZ Thruster 3000kW stern unverified
· 3000.0 kW · retractable azimuth pod
Power (kW)
3000
Thrust (kN)
420.0
Diameter (mm)
2300
Type
azimuth
Location
stern
Strengths
  • Full 360° thrust vectoring gives superior maneuverability and dynamic positioning capability.
  • Retractable design reduces hydrodynamic drag when the thruster is not needed, improving fuel efficiency.
  • Integrated electric drive eliminates a conventional shaft line, lowering vibration and noise levels.
  • High power‑to‑thrust ratio (3000 kW → 420 kN) suitable for medium‑size vessels requiring strong bollard pull.
  • Compact installation frees up aft deck space for cargo handling or accommodation.
Weaknesses
  • Higher initial capital cost compared with conventional shaft‑line propellers.
  • Requires sophisticated control and monitoring systems, increasing crew training needs.
  • Maintenance of the sealed electric motor and retractable mechanism can be more complex and costly.
  • Pod diameter (2.3 m) and weight may limit applicability on smaller hull forms or vessels with restricted aft space.
  • Electrical power supply must be robust; retrofitting older ships may need extensive rewiring.
Typical Vessels: LNG carrierCruise shipOffshore supply vesselContainer ship (mid‑size)Bulk carrier (handymax)Tanker (product/chemical)
Certifications: IMO Type ApprovalDNV Class
Decision Guide: Choose if: you need high maneuverability, DP capability, space savings aft, and are willing to invest in electric propulsion infrastructure. Avoid if: budget constraints dominate, vessel size cannot accommodate the pod diameter, or a simple conventional shaft line meets performance needs.
Use Cases: The Azipod CZ is commonly installed on vessels that operate in confined ports, require precise station‑keeping for offshore operations, or benefit from reduced hull resistance during long voyages. It is favored on LNG carriers and cruise ships for its smooth ride and on offshore supply vessels for DP‑3 class maneuvering.
Datasheet

Voith VSP

10
VSP Thruster 300kW bow unverified
· 300.0 kW · retractable azimuth thruster
Power (kW)
300
Thrust (kN)
45.0
Diameter (mm)
610
Type
azimuth
Location
bow
Strengths
  • Instantaneous 360° thrust vectoring for precise manoeuvring
  • Retractable design reduces hydrodynamic resistance during transit
  • Compact installation footprint suitable for vessels with limited hull space
  • Low vibration and noise compared with conventional tunnel thrusters
Weaknesses
  • Maximum thrust (≈45 kN) may be insufficient for large DP‑class ships
  • Retract/extend mechanism adds mechanical complexity and maintenance requirements
  • Higher specific fuel consumption per kN of thrust than larger fixed tunnel units
Typical Vessels: Offshore supply vesselFerryCruise ship (mid‑size)Container feeder
Decision Guide: Choose if you need a compact, retractable bow thruster that provides full‑circle thrust for vessels up to ~5 000 gt and value reduced drag during cruising. Avoid if the vessel requires higher thrust levels (>50 kN), operates in extreme ice conditions, or prefers a simpler fixed tunnel thruster with lower maintenance overhead.
Use Cases: Commonly installed on offshore supply ships, ferries and mid‑size cruise vessels to aid docking, undocking and dynamic positioning. The retractable feature is especially valuable for vessels that spend long periods underway at speed, as the unit can be hidden to improve fuel efficiency while still being available for precise low‑speed manoeuvres.
Datasheet
VSP Thruster 300kW stern unverified
· 300.0 kW · cycloidal propulsion
Power (kW)
300
Thrust (kN)
45.0
Diameter (mm)
610
Type
azimuth
Location
stern
Strengths
  • Instantaneous 360° thrust direction change without rotating the whole pod
  • High thrust‑to‑power ratio – up to ~45 kN at 300 kW
  • Retractable design reduces hull resistance during transit
  • Compact installation footprint, ideal for vessels with limited aft space
  • Excellent low‑speed control, suited for DP and tight harbour operations
Weaknesses
  • Higher capital cost than conventional fixed‑pitch azimuth thrusters of similar power
  • More complex mechanical arrangement (blade pitch gear) increases maintenance skill requirements
  • Maximum speed and efficiency lower than a standard propeller‑driven shaft at higher RPMs
  • Spare parts and service support are specialised, potentially longer lead times
  • Noise and vibration can be noticeable at certain operating points
Typical Vessels: Coastal TugOffshore Supply VesselFerry (short‑route)Small Cruise ShipResearch / Survey Vessel
Certifications: DNV
Decision Guide: Choose if the vessel needs high manoeuvrability, dynamic positioning or frequent low‑speed operations and benefits from a retractable unit to minimise drag on cruise. Avoid if budget is tight, the ship operates mainly at higher speeds where conventional azimuth thrusters are more efficient, or spare‑part logistics for cycloidal units are problematic.
Use Cases: Commonly installed on tugs and offshore supply vessels that require rapid thrust reversal and precise positioning while working near platforms; also fitted to ferries and small cruise ships for tight harbour docking where a retractable unit keeps transit resistance low.
Datasheet
VSP Thruster 500kW bow unverified
· 500.0 kW · Voith Schneider Propeller (VSP)
Power (kW)
500
Thrust (kN)
75.0
Diameter (mm)
750
Type
azimuth
Location
bow
Strengths
  • Instantaneous 360° thrust direction without rotating the whole unit
  • Compact footprint ideal for bow installations where space is limited
  • Retractable design reduces hull resistance when not in use
  • Excellent low‑speed maneuverability, suited for DP and tight‑berth operations
Weaknesses
  • Higher initial purchase and installation cost than conventional azimuth thrusters
  • More complex mechanical arrangement leads to higher maintenance expertise requirements
  • Thrust per kW is generally lower than that of a comparable fixed‑pitch propeller azimuth unit
  • Requires dedicated control system integration and operator training
Typical Vessels: Cruise shipsOffshore supply vessels (OSV)Ro‑Pax ferriesLNG carriers with DP capabilityContainer ships requiring enhanced bow handling
Certifications: DNVIMO Type Approval
Decision Guide: Choose if: you need high‑precision maneuverability, dynamic positioning, or want a retractable unit to minimise drag in open water. Avoid if: budget constraints dominate, the vessel operates primarily at higher speeds where conventional azimuth thrusters provide better thrust efficiency, or crew lack VSP‑specific training.
Use Cases: Commonly installed on vessels that must dock in confined ports, maintain position during offshore operations, or execute rapid heading changes—e.g., cruise liners approaching a narrow berth, OSVs holding station beside an FPSO, and ferries navigating busy terminals.
Datasheet
VSP Thruster 500kW stern unverified
· 500.0 kW · cycloidal propulsion
Power (kW)
500
Thrust (kN)
75.0
Diameter (mm)
750
Type
azimuth
Location
stern
Strengths
  • Full 360° thrust vectoring gives exceptional maneuverability and station‑keeping capability.
  • Retractable design reduces drag during transit and protects the unit from fouling or impact.
  • Compact diameter (750 mm) fits well in vessels with limited hull space.
  • Low vibration and noise compared with conventional propellers, improving crew comfort.
  • High thrust at low speeds makes it ideal for tugs, DP‑operated ships and ferries.
Weaknesses
  • Higher initial purchase price and lifecycle cost than standard fixed azimuth thrusters.
  • Complex mechanical arrangement (retraction mechanism, cycloidal gear) increases maintenance workload.
  • Efficiency drops at higher ship speeds; not suited for vessels that cruise continuously at full speed.
  • Requires dedicated hull space and structural reinforcement for the retractable housing.
  • Spare parts and specialised service expertise may be less widely available than for conventional thrusters.
Typical Vessels: Harbour tugOffshore supply vesselDynamic positioning vesselFerryCruise ship (stern thruster)
Decision Guide: Choose if the vessel needs precise low‑speed handling, DP capability or frequent maneuvering in confined waters and can accommodate the higher cost and maintenance of a cycloidal unit. Avoid if the primary operation is high‑speed transit, budget constraints dominate, or the ship lacks space for a retractable housing.
Use Cases: Commonly installed on harbour tugs for rapid bollard‑pull maneuvers, offshore supply vessels that require DP station‑keeping while drilling, ferries docking in tight terminals, and cruise ships using stern thrusters to assist with berthing and low‑speed positioning.
Datasheet
VSP Thruster 750kW bow unverified
· 750.0 kW · Voith Schneider Propeller (VSP)
Power (kW)
750
Thrust (kN)
112.5
Diameter (mm)
925
Type
azimuth
Location
bow
Strengths
  • Instantaneous 360° thrust direction control without rotating the unit
  • High thrust‑to‑power ratio (≈112.5 kN at 750 kW)
  • Retractable design reduces hull resistance during cruising
  • Low draft suitable for shallow‑water operations
  • Proven reliability in DP and tug applications
Weaknesses
  • Higher capital cost than conventional azimuth bow thrusters
  • Complex blade‑pitch gear requires specialised maintenance
  • Limited maximum vessel speed due to VSP design characteristics
  • Retract/extend mechanism adds space, weight and potential failure points
  • Potential for higher acoustic signature compared with some screw thrusters
Typical Vessels: TugboatOffshore Supply Vessel (OSV)FerryDynamic Positioning vesselCruise ship (bow thruster application)
Certifications: DNV
Decision Guide: Choose if the vessel needs precise, low‑draft maneuverability for DP, harbor docking or ice navigation and can accommodate the higher upfront cost and space for a retractable unit. Avoid if budget is tight, the ship operates at high transit speeds where conventional azimuth thrusters are more efficient, or maintenance facilities lack VSP expertise.
Use Cases: Commonly deployed on tugs and offshore supply vessels for dynamic positioning, on ferries for rapid side‑way docking, and on cruise ships where a retractable bow thruster improves fuel efficiency while still providing tight berth handling in ports.
Datasheet
VSP Thruster 750kW stern unverified
· 750.0 kW · cycloidal retractable azimuth thruster
Power (kW)
750
Thrust (kN)
112.5
Diameter (mm)
925
Type
azimuth
Location
stern
Strengths
  • Very high maneuverability with instantaneous thrust direction change
  • Retractable design reduces drag when not in use and allows operation in shallow water
  • Compact diameter (≈925 mm) fits vessels with limited hull space
  • Integrated control system compatible with DP‑2/DP‑3 dynamic positioning
  • Low acoustic signature compared with conventional propellers
Weaknesses
  • Higher capital cost than standard tunnel or fixed azimuth thrusters
  • Complex gear and blade mechanism increases maintenance intervals
  • Maximum thrust (≈112 kN) may be insufficient for very large vessels requiring high bollard pull
  • Noise and vibration can be higher at certain blade‑pitch settings
  • Requires dedicated control electronics and trained operators
Typical Vessels: Offshore supply vesselPlatform supply vessel (PSV)Dynamic positioning tugFerryCruise ship (stern maneuvering)
Decision Guide: Choose if you need precise, low‑draft thrust vectoring for DP or tight docking and can accommodate a higher upfront cost. Avoid if the vessel requires very high bollard pull, operates on a strict budget, or prefers a simpler maintenance regime.
Use Cases: Commonly installed on offshore support ships that must hold position beside rigs, ferries that need rapid stern‑to‑bow turning in confined ports, and cruise vessels where a retractable thruster reduces drag during cruising but provides powerful maneuvering when docking.
Datasheet
VSP Thruster 1000kW bow unverified
· 1000.0 kW · Voith Schneider cycloidal propeller
Power (kW)
1000
Thrust (kN)
150.0
Diameter (mm)
1100
Type
azimuth
Location
bow
Strengths
  • Instantaneous thrust direction change without mechanical steering gear
  • High maneuverability ideal for dynamic positioning and tight berthing
  • Compact vertical layout fits in limited hull space when retracted
  • Low vibration and noise compared with conventional azimuth thrusters
  • Good low‑speed efficiency, reducing fuel consumption during manoeuvres
Weaknesses
  • Higher initial purchase price than standard fixed‑pitch azimuth units
  • Complex blade‑control mechanisms increase maintenance skill requirements
  • Limited maximum thrust compared with some large ducted propeller thrusters of similar power
  • Retractable housing adds weight and occupies internal volume
  • Spare parts inventory is specialised, potentially longer lead times
Typical Vessels: Cruise shipsFerriesOffshore supply vessels (DP‑class)LNG carriers with tight berthing constraintsLarge passenger ferries
Certifications: IMO Type ApprovalDNV class notation
Decision Guide: Choose if the vessel requires precise, rapid thrust vectoring for dynamic positioning, frequent tight‑berth operations, or enhanced maneuverability in confined waters. Avoid if budget constraints dominate, the ship operates primarily at high speed where a conventional azimuth thruster offers better thrust efficiency, or maintenance facilities lack experience with cycloidal gear.
Use Cases: The VSP 1000 kW bow thruster is commonly installed on cruise liners and ferries to enable quick side‑way docking without tug assistance, on offshore supply vessels for DP‑2 station keeping during offshore operations, and on LNG carriers where precise low‑speed handling reduces berthing time.
Datasheet
VSP Thruster 1000kW stern unverified
· 1000.0 kW · cycloidal propulsion
Power (kW)
1000
Thrust (kN)
150.0
Diameter (mm)
1100
Type
azimuth
Location
stern
Strengths
  • Instantaneous 360° thrust direction change enables precise station‑keeping and DP operations
  • High thrust‑to‑power ratio (≈150 kN @ 1000 kW) compared with conventional azimuth thrusters of similar size
  • Low vibration and noise due to the cycloidal blade action, beneficial for passenger comfort
  • Retractable installation reduces drag when the unit is not in use, improving fuel efficiency on transit legs
Weaknesses
  • Mechanically complex gear train results in higher maintenance intervals and specialised spare parts
  • Higher capital cost than standard fixed‑pitch azimuth thrusters of comparable power
  • Maximum propulsive speed limited; not ideal for vessels requiring high cruising speeds
  • Hull penetration for the retractable housing can be a source of leakage if not properly maintained
Typical Vessels: Offshore supply & anchor handling tug supply (AHTS) vesselsDynamic positioning (DP) platform service shipsFerries and high‑speed passenger craft requiring tight harbor turnsCruise ship stern thrusters for precise docking
Decision Guide: Choose if: you need rapid, omnidirectional thrust for DP, tight maneuvering in confined ports, or low acoustic signature. Avoid if: project budget is highly constrained, vessel operates primarily at high transit speeds, or maintenance infrastructure for cycloidal gearboxes is unavailable.
Use Cases: Commonly installed on offshore support vessels that must hold position beside oil rigs, on ferries docking multiple times per day in busy terminals, and on cruise ships where precise stern‑side thrust aids in parallel docking without tug assistance.
Datasheet
VSP Thruster 1500kW bow unverified
· 1500.0 kW · retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
225.0
Diameter (mm)
1450
Type
azimuth
Location
bow
Strengths
  • High thrust‑to‑power ratio (≈225 kN at 1500 kW) for rapid maneuvering
  • Retractable design reduces hull resistance and fuel consumption when not in use
  • 360° azimuth steering provides precise station‑keeping and docking control
  • Integrated hydraulic/electronic control system simplifies operator handling
  • Relatively compact diameter (1450 mm) fits into medium‑size bow sections
Weaknesses
  • Higher capital cost compared with fixed tunnel thrusters of similar power
  • Complex retractable mechanism adds maintenance tasks and potential downtime
  • Hydraulic system requires regular inspection for leaks and oil contamination
  • Blade fouling can reduce efficiency if not cleaned frequently in high‑biofouling areas
  • Installation demands structural reinforcement of the bow, increasing retrofit effort
Typical Vessels: Cruise shipsFerriesOffshore supply vesselsLNG carriers (mid‑size)Container ships (up to 8 000 TEU)
Decision Guide: Choose if the vessel operates in confined ports, requires dynamic positioning or frequent docking maneuvers, and can accommodate a retractable unit to save cruise resistance. Avoid if budget is tight, the ship’s operational profile does not demand high‑precision thrust control, or space for the retraction system is unavailable.
Use Cases: The VSP 1500 kW bow thruster is commonly installed on passenger ferries and offshore support ships that need rapid side thrust for docking, as well as on larger cargo vessels that benefit from reduced drag during open‑water voyages by retracting the unit when not needed. It also supports DP‑class operations where instant thrust vectoring is essential.
Datasheet
VSP Thruster 1500kW stern unverified
· 1500.0 kW · retractable azimuth thruster
Power (kW)
1500
Thrust (kN)
225.0
Diameter (mm)
1450
Type
azimuth
Location
stern
Strengths
  • High thrust‑to‑power ratio (225 kN at 1500 kW) for strong maneuvering capability
  • Retractable design reduces hull resistance when the unit is not in use, improving fuel efficiency
  • Full 360° rotation enables precise dynamic positioning and docking operations
  • Compact diameter (1.45 m) fits into standard stern tunnel arrangements
  • Voith’s proven hydraulic‑electric control system offers low vibration and reliable service
Weaknesses
  • Requires a dedicated retractable tunnel and associated hull modifications, limiting retrofit applicability
  • Higher capital cost compared with fixed ducted propellers or conventional bow thrusters
  • Complex hydraulic/electrical systems increase maintenance demands and spare‑part inventory
  • Off‑design thrust efficiency can drop at extreme azimuth angles
  • Maximum thrust is lower than larger fixed tunnel thrusters of the same power rating
Typical Vessels: Offshore supply vesselsDynamic positioning (DP) vesselsCruise shipsLarge tankers and bulk carriers requiring stern maneuverabilityContainer ships operating in constrained ports
Certifications: DNV GL class approval
Decision Guide: Choose if the vessel needs high‑precision steering, DP capability, or wants to minimise drag when the thruster is not engaged. Avoid if budget constraints prohibit a retractable system, hull space cannot accommodate a tunnel, or thrust requirements exceed what a 1500 kW azimuth unit can provide.
Use Cases: Commonly installed on offshore support vessels for station‑keeping near rigs, on cruise ships for tight port manoeuvring, and on large tankers to aid stern docking and emergency stopping. The retractable feature is especially valued on vessels that spend most of their time underway at speed but require occasional high‑power thrust for maneuvering.
Datasheet