HIGHLY SKEWED PROPELLERS FOR SAN CLEMENTE CLASS ORE/BULK/OIL CARRIER DESIGN CONSIDERATIONS, MODEL AND FULL-SCALE EVALUATION

The design procedure, design decisions, final geometric configuration, model experimental results, and full-scale trial results of the first known highly skewed propeller installed on a U.S. Merchant Ship are presented. This paper is the culmination of a research program sponsored by the U.S. Maritime Administration to evaluate the feasibility of highly skewed propellers as a means to minimize ship vibration problems on high-powered merchant ships. The ships selected for this investigation were the two San Clemente Ore/Bulk/Oil Carriers built by National Steel and Shipbuilding Company for the Aries Marine Shipping Company. One ship was equipped with a conventional propeller and the second ship was fitted with the highly skewed propeller. Both propellers were designed specifically for these ships. Comparative performance evaluations of the conventional and highly skewed propeller are documented and analyzed. The primary advantages demonstrated by the highly skewed propeller are a reduction in unsteady propeller thrust by a factor of 2.6, a reduction in unsteady pressure forces by a factor of 4, and a reduction in vibration levels by a factor of from 1 to 4. These advantages are shown to be achieved without an adverse effect on the ahead and backing performance. The main conclusion is that highly skewed propellers are both technically and economically feasible from the standpoint of available design capability and assurance in realizing the advantages, and should be considered for future ship designs.

• Supplemental Notes:
  • Presented at the First Ship Technology and Research (STAR) Symposium, Washington, D.C., August 26-29, 1975.
• Corporate Authors:

  Society of Naval Architects and Marine Engineers

  601 Pavonia Avenue
  Jersey City, NJ  United States  07306-2907
• Authors:
  • Valentine, D T
  • Dashnaw, F J
• Publication Date: 1975-8

Media Info

• Features: References;
• Pagination: 22 p.

Subject/Index Terms

• TRT Terms: Aerodynamic lift; Backing (Driving); Driving; Maneuvering; Propellers; Vehicle design; Vibration; Wakes
• Old TRIS Terms: Lifting surface theory; Propeller design; Propeller vibration; Skewed propellers; Wake analysis
• Subject Areas: Design; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00126938
• Record Type: Publication
• Source Agency: Society of Naval Architects and Marine Engineers
• Report/Paper Numbers: #11
• Files: TRIS
• Created Date: Nov 5 1975 12:00AM