SLOW, CONTROLLED PITCH

The Author, of the KMW Marine Laboratory, Kristinehamn, Sweden, after stressing the importance of improving propulsive efficiency in the face of rising fuel costs, describes how this can be achieved by combining a large- diameter CP Propeller with an unconventional hull form. A single CP propeller driven by two or more Diesel engines enables a ship to operate at various speeds utilizing optimum propeller pitch. This results in maximum propulsive efficiency, facilitates maintenance, and permits the use of shaft-driven generators running at constant speed. The need to adopt an unconventional after-body hull form in order to reduce the effects of propeller/hull vibration etc. is emphasised and the use of semi-tunnel sterns in this field is described. To lend weight to the advantages of using a large-diameter CP propeller, the Author gives comparative data for the propulsive efficiency of two very similar self-unloading bulk carriers, Canadian Enterprise and Canadian Transport, both built by the Port Weller Dry Docks for Upper Lakes Shipping Ltd. Both ships have single KaMeWa propellers driven by twin Diesels but the one fitted to Canadian Enterprise is of larger diameter and of controllable-pitch design and is located beneath a semi-tunnel stern. Order from BSRA as No. 54,170.

• Corporate Authors:

  Maclean-Hunter Limited

  481 University Avenue
  Toronto 2, ONo,   Canada 
• Authors:
  • Dalvag, T
• Publication Date: 1980

Media Info

• Pagination: p. 21
• Serial:
  • Canadian Shipping and Marine Engineering
  • Issue Number: 51
  • Publisher: Maclean-Hunter Limited

Subject/Index Terms

• TRT Terms: Controllable pitch propellers; Engine efficiency; Hulls; Pitch (Dynamics); Propellers; Propulsion; Vibration
• Old TRIS Terms: Hull forms; Hull propeller interaction; Propeller induced vibration; Propeller pitch; Propulsive efficiency
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00323278
• Record Type: Publication
• Source Agency: British Ship Research Association
• Files: TRIS
• Created Date: Feb 18 1981 12:00AM