The recent investigations of model-ship correlation for manoeuvring are progressing to provide a better qualified understanding of the hydrodynamical problems. However, the irregular flow pattern at full-bodied sterns affects model-ship correlation, and the prediction of the performance of actual ships from model testing remains unsatisfactory. In fact, the recommendation of the 12th International Towing Tank Conference strongly is to supply such data to the Manoeuvrability Committee. Herein described are the correlation studies of the free manoeuvring three geosim tanker models and the Ship trial results. The largest geosim model was 14.5 meters in length and proved to be scarcely suffering from the scale effect. The smaller ones of 6.0 and 2.0 meters in length were subjected to more discrepancy in terms of the turning rate for slight helm, compared with the actual ship. In order to reduce the discrepancy, several kinds of fin plates were fitted to the aft bodies of the above-mentioned models. The effectiveness of the fins was investigated by collating the data of zig-zag tests, three force components measuring, and flow observation. The additional correlation data on two ships B and C were included in view of the need for such information.

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  • Corporate Authors:

    Society of Naval Architects of Japan

    15-16, Toranomon, 1-chome, Minato-ku
    Tokyo,   Japan 
  • Authors:
    • OKAMOTO, H
    • Oniki, H
    • Tamai, H
  • Publication Date: 1972

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Filing Info

  • Accession Number: 00323682
  • Record Type: Publication
  • Source Agency: Stevens Institute of Technology
  • Files: TRIS
  • Created Date: Apr 15 1981 12:00AM