THEORETICAL AND EXPERIMENTAL PREDICTION OF PROPELLER INDUCED FORCE ON LARGE, TOWED OFFSHORE STRUCTURES

During towing operations, a considerable reduction in towing efficiency can sometimes be experienced, due to the propeller race hitting the towed structure. In the present paper a theory is put forward for calculating theoretically this propeller induced force. Although the results thus obtained do not turn out to be entirely satisfactory, in most cases they are in rough agreement with experiments. In addition to the theoretical considerations, several model tests have been performed, simulating a two propeller tug equipped with two especially designed, rotatable nozzles. The results from these tests were quite encouraging, suggesting that the towing efficiency could be greatly improved by directing the propeller race by means of the nozzles.

• Supplemental Notes:
  • This paper was presented at the 12th Annual OTC in Houston, Texas, May 5-8, 1980.
• Corporate Authors:

  Offshore Technology Conference

  6200 North Central Expressway
  Dallas, TX  United States  45206
• Authors:
  • Teigen, P S
• Publication Date: 1980

Media Info

• Pagination: p. 389
• Serial:
  • Publication of: Offshore Technology Conference
  • Publisher: Offshore Technology Conference

Subject/Index Terms

• TRT Terms: Force; Nozzles; Propellers; Propulsion; Towing devices; Tugboats
• Old TRIS Terms: Propeller induced forces; Towed bodies; Towing capacity; Tug propulsion
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00325769
• Record Type: Publication
• Source Agency: Offshore Technology Conference
• Report/Paper Numbers: Volume 3 Proceeding
• Files: TRIS
• Created Date: Mar 12 1981 12:00AM