EFFECTS OF PROPELLER LOADING ON RUDDER EFFICIENCY
The peformance of a rudder at the stern of a ship is dependent on the advance velocity at the rudder. This velocity is not uniform as it is the combined flow of the non-uniform wake of the ship's hull and the propeller induced velocities. The rudder characteristics (drag, lift and torque) are, however, in general calculated from data valid for a uniform flow and some estimates of the influence of the ship's wake and the propeller induced velocities. Data for rudders in uniform flow may be obtained from theory (low aspect ratio wing theory) or from experiments. Results from tests of rudders in the propeller slipstream are also given. Most results are, however, limited in the range of propeller loadings tested. In order to obtain data for rudder characteristics for a realistic range of propeller loadings and to test the validity of using the momentum theory for estimating flow velocities at the rudder, a series of model tests has been carried out in a towing tank and in a cavitation tunnel. The tests also included rudders in uniform flow. As a secondary result from the experiments some insight into the effects of using different rudder sections was gained.
- Presented at the 4th Ship Control Systems Symposium, 1975.
Royal Netherlands Naval CollegeP-de Hoochweg
129 Rotterdam, Netherlands
- Van Berlekom, W B
- Publication Date: 1975
- Pagination: n.p.
- TRT Terms: Flow; Mechanical loads; Momentum; Performance; Rudders; Tanks (Containers); Towing devices; Velocity
- Uncontrolled Terms: Flow velocity
- Old TRIS Terms: Model testing; Momentum theory; Propeller loading; Towing tanks; Velocity analysis
- Subject Areas: Design; Marine Transportation; Vehicles and Equipment;
- Accession Number: 00323726
- Record Type: Publication
- Source Agency: Stevens Institute of Technology
- Files: TRIS
- Created Date: May 21 1981 12:00AM