PRODUCING A UNIFORM WAKE
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.
- This article is part of a "Marine Design International 1978" Supplement.
IPC Industrial Press LimitedDorset House, Stamford Street
London SE1 9LU, England
- Garrett, D
- Publication Date: 1978-3
- Pagination: 1 p.
- Marine Week
- Publisher: IPC Business Press Limited
- TRT Terms: Damping (Physics); Engine efficiency; Hulls; Propellers; Propulsion; Wakes
- Old TRIS Terms: Hull forms; Hull propeller interaction; Propeller wake; Propulsive efficiency
- Subject Areas: Marine Transportation; Vehicles and Equipment;
- Accession Number: 00180040
- Record Type: Publication
- Source Agency: British Ship Research Association
- Files: TRIS
- Created Date: Sep 27 1978 12:00AM