ADAPTATION OF RUDDER EFFECTIVENESS IN SHIP-MODEL TESTS TO THE FULL-SCALE SHIP

Extrapolation, to full scale, of model-test results of steered ship-motions has to take several scale-effects into consideration. These are discussed, and an account is given of investigations carried out, at Rostock, with the object of increasing the transverse forces on the rudder in model tests, a necessary step if predictions are to be made of full-scale behaviour. The experimental equipment and methods are described, and the results are presented and discussed. Preliminary tests carried out with a model rotor-rudder in the cavitation tunnel were followed by tests in the rotating-arm basin with this type of rudder fitted to a Mariner model. The tests showed that the rotor rudder was suitable for tests on rudder effectiveness, even at sub-critical Reynolds numbers. The transverse force on the rudder fitted to the ship-model was determined for various propeller-thrust loading coefficients, and it was found that, with a knowledge of the wake field for a straight trajectory, an approximate calculation could be made for the rudder transverse-force for a ship with an angle of yaw and a curved trajectory. Order from BSRA as No. 49,238.

  • Corporate Authors:

    Institut fuer Schiffbau

    Wismarsche Strasse 617
    25 Rostock,   Germany 
  • Authors:
    • Puls, D
  • Publication Date: 1977

Language

  • German

Media Info

  • Features: References;
  • Pagination: p. 175
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00185303
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jan 13 1979 12:00AM