SEA TRIALS OF ANTI-PITCHING FINS

Model experiments and full-scale trials to investigate the effects on pitching motions of fixed fins at the bows of a ship are described. The trials involved two sisterships, one of which was fitted with bow fins, the two ships being operated together to provide a direct measure of the effects of fins on ship behavior. The investigation, which encompassed a wide range of wave conditions, showed that although appreciable reduction of motion can be achieved by fixed fins, these reductions may be accompanied by severe practical problems arising from the shallow submergence of the fins and the associated air entrainment and slamming. Greater attenuation of motions could be anticipated from active fins, but the designer of such a system would be faced not only with all the practical disadvantages encountered with fixed fins, but also with the formidable problem of providing the necessary actuating machinery and controls with adequate structural strength.

  • Corporate Authors:

    Royal Institution of Naval Architects

    10 Upper Belgrave Street
    ,   USA 
  • Authors:
    • Conolly, J E
    • Goodrich, G J
  • Publication Date: 1970-1

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00015039
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: May 7 1971 12:00AM