Many experimental investigations have been made on the lateral force acting on a ship in a manoeuvre, and it has been found that the hydrodynamic force induced on the hull when using the rudder amounts to about 30% of the rudder force. However, the effect of the presence of the rudder force. However, the effect of the presence of the hull upon the rudder force has not yet been clarified, and the main purpose of the present study is to investigate this particular problem. In the study, it is assumed that the hull and the rudder can be represented by a low aspect-ratio rectangular wing and its flap, which is separated from the wing. The integral equations based on non-linear lifting-surface theory are derived, and the values thus calculated are compared with experimental data. The calculated values for the normal force acting on the rudder and the main hull agree fairly well with the experimental ones. By comparing the hydrodynamic forces of the rudder and the hull, in a hull/rudder system, with those occurring when the rudder and the hull exist independently, the Authors discuss the hull/rudder interaction. It is shown that additional hydrodynamic force due to steering is induced on the main hull, but the rudder effectiveness is reduced compared with that in open water. Order from BSRA as No. 53,407.

  • Availability:
  • Corporate Authors:

    Society of Naval Architects of Japan

    23 Shiba-kotohiracho, Minato-ku
    Tokyo 135,   Japan 
  • Authors:
    • Fujino, M
    • Numata, T
    • Motora, S
  • Publication Date: 1979-12


  • Japanese

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Filing Info

  • Accession Number: 00316625
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Oct 8 1980 12:00AM