Reducing propeller-speed to improve propulsion efficiency has hitherto involved gearing and vibration difficulties. Gearing is, however, now available for low-speed Diesels which enables propeller speeds to be reduced to about 45-75 rpm. The vibration difficulty may be overcome with the Pilgrim patent hull-form. The reduced hull clearances due to the larger propeller (needed for the lower rpm) will normally exacerbate the vibration problem. The Pilgrim hull-form overcomes this by producing a more uniform wake-field across the propeller disc and maintains hull efficiency at the same time. This is achieved by providing carefully-designed channels in the hull for directing water into the upper part of the propeller disc; the channels replace the conventional double curvature of the afterbody. The article mentions some other advantages of this hull form.

  • Supplemental Notes:
    • This article is part of a "Marine Design International 1978" Supplement.
  • Corporate Authors:

    IPC Industrial Press Limited

    Dorset House, Stamford Street
    London SE1 9LU,   England 
  • Authors:
    • Garrett, D
  • Publication Date: 1978-3

Media Info

  • Pagination: 1 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00180040
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Sep 27 1978 12:00AM