This paper treats some model experiments in shallow water effects upon the turning ability of ships. These experiments were carried out at the Ship Research Institute with the Cooperation of Sasebo Heavy Industries Co. Turning tests were carried out for two model ships, one a cargo ship, the second a very large tanker. Water depths were varied. Both models were self propelled and radio controlled. These tests show that shallow effect upon turning ability increases slightly in accordance with a decrease in water depth, while depth is deeper than 2 1/2 times the draft and increases remarkably when the depth decreases less than this. For example, the nondimensional angular velocity for 35 degrees helm angle, at a water depth of 2 1/2 times draft is equal to 90/95 percent of the same helm in deeper water. However, at 1 1/3 times draft the nondimensional angular velocity is equal to 50/60 percent for deep water at the same helm angle.

  • Corporate Authors:

    Society of Naval Architects of Japan

    23 Shiba-kotohiracho, Minato-ku
    Tokyo 135,   Japan 
  • Authors:
    • Koseki, N
    • Yamanouchi, Y
    • Matsuoka, S
    • Yamazaki, Y
  • Publication Date: 1969

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Filing Info

  • Accession Number: 00035092
  • Record Type: Publication
  • Source Agency: Society of Naval Architects of Japan
  • Files: TRIS
  • Created Date: Oct 27 1973 12:00AM