Some of the energy dissipated in the formation of the boundary layer around a moving ship can be recovered by the propeller converting it into thrust. The Author gives an account of tests on a ship model with a form designed to direct the detached boundary-layer towards the propeller, with the object of recovering more of this energy. The model, a "fish" form without parallel sides and a full forebody combined with a very fine afterbody, represented a single-screw, 253-m long, 16-knot cargo-ship. Its form was developed by distorting that of a model of good conventional shape, and of known performance, whose wake has been surveyed by measuring pressure losses in the water, well behind the model (1/4L astern of the AP). Similar surveys were carried out on the fish-form model. The article includes body plans and principal particulars of both hull-forms, and also diagrams giving the results of the surveys of each form with loaded propeller and without propeller; the survey results are discussed. The results of performance tests on the fish-form model are compared, in some detail, with those from the conventional model, and show, inter alia, that at 16 nots the fish form has about 5.8% less resistance and requires about 5.6% less power. These results, and their significance, are discussed. This work was carried out at the Hamburg tank, as part of the SFB 98 program.

  • Availability:
  • Corporate Authors:

    Seehafen-Verlag Erik Blumenfeld

    Celsiusweg 15, Postfach 1347
    2000 Hamburg 50,   Germany 
  • Authors:
    • Andersson, G O
  • Publication Date: 1976-10

Media Info

  • Features: References;
  • Pagination: 4 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00153102
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: May 11 1977 12:00AM