THE JASTRAM RUDDER ROTOR ON TEST - TRID

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THE JASTRAM RUDDER ROTOR ON TEST

The Hansa Line's roll-on/roll-off ship Rabenfels and her three sister-ships each have a semi-balanced rudder which incorporates a Jastram rotor at its leading edge.  The rotor, whose length is 3 m, has an average diameter of 0.5 m and is driven hydraulically; maximum speed is 380 rpm.  It is arranged to have its greatest effect at ship-speeds up to 5 knots, and is automatically switched off at 10 knots (or at a corresponding propeller-pitch; maximum rudder angle is 68 deg. (to each side) when the rotor is operating, and is reduced to 35 deg. when the rotor is switched off.  The Author, of the Jastram company, Hamburg, explains in detail how the rotor enables the rudder to be effective at large angle's of helm (lift increases up to angles of about 50 or 60 deg., after which it gradually decreases), and so assists manoeuvring at low speeds.  The influence of the inflow velocity to the propeller and rudder is also discussed.  The results of turning-cricle tests on the Rheinfels, one of the four ships, are presented and examined for turns both with the without the rotor in operation.  Results of other manoeuvres, including the use of the rotor in combination with the ship's twin bow-thrusters, are also discussed. These results, together with subsequent service experience, show the excellent capabilities of the rotor, particularly at the higher propeller-loadings.  The turning-circle diameter is reduced to a ship-length, and the combination of bow-thrusters and rotor-rudder enables the ship to move sideways at 2 knots while moving ahead at 1 to 2 knots., Some further capabilities of the rotor-rudder are mentioned. Order from BSRA as No. 51,925.

Corporate Authors: 

Schroedter (C) and Company

Stubbenhuk 10
Hamburg 11,  
									Germany 
									

Authors: 

Weiss, F

Publication Date: 
1979-9

Language 

German

Media Info 

Pagination: 
p. 1368

Serial: 

HANSA

Volume: 116

Issue Number: 18

Publisher: Deutsche Bahn AG

Subject/Index Terms 

TRT Terms: 

Maneuverability
; 
Maneuvering
; 
Performance
; 
Propellers
; 
Roll on roll off ships
; 
Rudders
; 
Turning radius

Old TRIS Terms: 

Propeller rudder interaction
; 
Rotating cylinder rudders
; 
Turning circle calculations

Subject Areas: 
Design; Marine Transportation; Vehicles and Equipment; 

Filing Info 

Accession Number: 
00303878

Record Type: 

										Publication
									

Source Agency: 
British Ship Research Association

Files: 
TRIS

Created Date: 

Feb 27 1980 12:00AM

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