HULL FORMS FOR IMPROVED TRANSPORT EFFICIENCY

In the present paper some examples are given of hull form investigations recently carried out by the Swedish State Shipbuilding Experimental Tank (SSPA). Special attention has been paid to the qualities of the hull forms will regard to the propulsive performance including propeller cavitation and vibration. Two main categories of merchant ships have been selected for closer studies, namely: Large tankers and bulkers (VLCCS/ULCCS) and high-powered container/ro-ro ships. The analysis and conclusions from the investigation seem to justify, for the VLCCS/ULCCS, a forebody with ellipsoidal hull form and an afterbody of twin-skeg (or twin-gondola) shape, as this combination gives the lowest required shaft horse power. For the high-powered container/ro-ro vessel, where cavitation and vibration problems aften occur, an afterbody hullform with "free space" around the propeller(s) is recommended. The choice of an economic forebody hull form is strongly dependent on, whether or not a reasonably constant forward draft can be kept.

• Supplemental Notes:
  • Paper presented at the Spring Meeting/STAR Symposium, New London, Connecticut, April 26-29, 1978. Available only in bound proceedings.
• Corporate Authors:

  Society of Naval Architects and Marine Engineers

  601 Pavonia Avenue
  Jersey City, NJ  United States  07306-2907
• Authors:
  • Williams, A
• Publication Date: 1978

Media Info

• Pagination: n.p.

Subject/Index Terms

• TRT Terms: Cavitation (Mechanics); Cavitation erosion; Economic analysis; Engine efficiency; Fuel consumption; Horsepower; Hulls; Performance; Propellers; Propulsion; Shafts (Machinery); Vibration
• Old TRIS Terms: Economic analysis (Hull forms); Hull forms; Propeller vibration; Propulsive efficiency; Propulsive performance
• Subject Areas: Design; Economics; Energy; Marine Transportation;

Filing Info

• Accession Number: 00173976
• Record Type: Publication
• Source Agency: Society of Naval Architects and Marine Engineers
• Report/Paper Numbers: No. 9
• Files: TRIS
• Created Date: May 3 1978 12:00AM