A THEORETICAL STUDY CONCERNING MUTUAL INTERFERENCE OF PROPELLER AND RUDDER

This report discusses theoretically the problem of mutual interference occuring in connection with the propeller performance of the propeller and rudder. Generally speaking, the efficiency of the propeller is determined by the ratio of the power applied to drive it to the fluid energy lost in the propeller wake, and, therefore, it is obvious that the propeller efficiency can be increased by reducing the lost energy. The Contra-rudder was devised especially for this purpose. In this report, emphasis is placed on the development of the theory of Contra-rudder, and, first, on the basis of the momentum theory, it explains the dynamic mechanism of the recovery with the rudder of the lost energy of the propeller, and inquiries are made into the possibilities of other methods for recovering such energy. Next, in order to quantitatively calculate the changes occuring in the propeller when the propeller behind which the rudder is provided is put in motion, the calculating formulae as obtained by the vortex theory are shown. Lastly, it expounds the method of designing a Contra-rudder based on the theory thus established, and the conditon of the propeller for the purpose of assuring the highest efficiency of the propeller system in the case a Contra-rudder is provided.

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  • Corporate Authors:

    Society of Naval Architects of Japan

    15-16, Toranomon, 1-chome, Minato-ku
    Tokyo,   Japan 

    Society of Naval Architects of Japan

    15-16, Toranomon, 1-chome, Minato-ku
    Tokyo,   Japan 
  • Authors:
    • TAKAGI, M
  • Publication Date: 1961

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Filing Info

  • Accession Number: 00323704
  • Record Type: Publication
  • Source Agency: Stevens Institute of Technology
  • Report/Paper Numbers: Vols 109, 110
  • Files: TRIS
  • Created Date: May 21 1981 12:00AM