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Shaft Line & Propulsion

Shafts, seals, bearings, CPP, couplings

16types 135manufacturers 4,155models

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Types in this category.

Every equipment type in Shaft Line & Propulsion links to full manufacturer and model data, specifications and service notes.

Outboard Engine (Petrol/SI)

Outboard Engine (Petrol/SI)

A petrol outboard is a self-contained propulsion unit — engine, gearbox, and propeller in one clamp-on housing — chosen for small craft and tenders specifically because it can be removed, serviced, and swapped without any shaft line work on the boat itself.

Sterndrive / Inboard Engine (Petrol/SI)

Sterndrive / Inboard Engine (Petrol/SI)

A petrol sterndrive or inboard engine is a spark-ignition, marinized automotive-derived block certified under EPA 40 CFR 1045, used on recreational and light commercial craft where its power-to-weight and low first cost beat a diesel of the same output, at the cost of a strict ventilation and ignition-protection regime that diesel installations do not carry.

Fixed-Pitch Propeller

Fixed-Pitch Propeller

A fixed-pitch propeller casts blade angle into the design once, at the point of highest efficiency for one speed and load — simpler, cheaper and more robust than a controllable-pitch unit, but reversing the ship means reversing the engine or gearbox rather than just the blades.

Controllable-Pitch Propeller (CPP)

Controllable-Pitch Propeller (CPP)

A controllable-pitch propeller rotates its blades about their own axis while shaft RPM stays constant, so thrust and direction are set by pitch angle rather than engine speed — full astern power is available instantly without reversing the engine, at the cost of a hydraulic hub and oil seals that must hold against seawater under pressure.

Propeller Shaft

Propeller Shaft

The propeller shaft is the last, and most highly loaded, length of shafting in the line — it carries full engine torque plus the propeller's full thrust, and it does so inside a stern tube where inspection means a shaft withdrawal, not a walk-round.

PWC / Jet Boat Engine (Petrol/SI)

PWC / Jet Boat Engine (Petrol/SI)

Personal watercraft and small jet boats run petrol spark-ignition engines driving a waterjet pump directly, a different fuel, ignition and emissions regime from the diesel compression-ignition engines that dominate the rest of the propulsion category.

Azimuth Thruster

Azimuth Thruster

An azimuth thruster steers by rotating its whole propulsion unit through 360 degrees rather than by a rudder behind a fixed shaft line, which removes the rudder but adds a right-angle gear train and a slewing bearing that now carry the vessel's entire manoeuvring load.

Propulsion Equipment

Propulsion equipment in this context covers the ancillary hardware that lets the shaft line be safely stopped, locked, and rotated at dead slow speed for maintenance: shaft brakes, turning gear, and the flexible couplings that connect engine, gearbox and shaft, rather than the propeller or bearings themselves.

Flexible Coupling

Flexible Coupling

A torsionally flexible coupling sits at the engine flywheel and absorbs torque pulses and misalignment that a rigid coupling cannot handle. Its stiffness and damping figures feed directly into the shaft line's torsional vibration calculation, and a worn coupling can quietly shift the resonance into the normal running range.

Voith Schneider Propeller

Voith Schneider Propeller

A Voith Schneider Propeller replaces the conventional shaft, screw and rudder with a disc of vertical blades under the hull whose pitch cycles once per revolution, producing thrust in any direction without a gearbox reversal, separate steering gear or bow thruster.

A controllable pitch propeller changes blade angle hydraulically while the shaft keeps turning at constant speed, trading the simplicity of a fixed blade for the ability to reverse thrust and match load without stopping the engine.

Marine Drive Systems & Accessories

Marine Drive Systems & Accessories

Integrated drive systems such as Volvo Penta IPS package a forward-facing, steerable pod, twin contra-rotating propellers and an electronic control system into one unit, replacing the separate shaft, rudder and single propeller of a conventional installation.

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Also in this category: Shaft Generator / PTO · Stern Tube Bearing · Stern Tube Seal

By manufacturer

Manufacturers.

All 135 manufacturers with models in Shaft Line & Propulsion. Every name opens a search across the full library.

Search by manufacturer AFRISO WISKA Swagelok Alfa Laval S.p.A.MAN Energy Solutions Wärtsilä Endress+Hauser ABB Marine Alfa Laval MacGregor Novenco Marine Carrier Marine seimi Siemens Marine Heinen & Hopman

Knowledge

What a Shaft Line & Propulsion engineer checks first.

A Voith Schneider Propeller (VSP) is a vertical-axis cycloidal propulsion unit fitted flush with the ship's bottom. A rotor disc carries four to six vertical blades that orbit around a common axis at a fixed depth of immersion. Each blade's angle of attack is varied continuously through the rotation by an internal kinematic control mechanism, so the resultant thrust vector can be set to any direction through 360 degrees, or reduced to zero, without changing rotor speed or reversing the drive. This is the key difference from an azimuth thruster…

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