PROPELLER SLIPSTREAM PERFORMANCE OF FOUR HIGH-SPEED RUDDERS UNDER CAVITATING CONDITIONS

A series of rudders with a geometric aspect of 1.5 but widely varying section shapes was constructed to determine the effect of section shape on the cavitating performance of high-speed rudders. Experiments on four of these rudders operating behind a propeller were conducted in the 24-inch, variable-pressure water tunnel over a cavitation number range from 4.0 to 0.5 and an angle of attack range from minus 35 to plus 35 degrees. The propeller ahead of the rudder was operated at propeller loadings of 0.07, 0.15, and 0.20. The propeller loading had a small effect on the maximum lift coefficient. Drag and rudder stock torque were little affected by increased loading at low angles of attack but were significantly affected at high angles of attack. Rudder stock torque was significantly affected by cavitation index.

• Corporate Authors:

  Naval Ship Research and Development Center

  Ship Performance Department
  Bethesda, MD  United States  20034
• Authors:
  • Mathis, P B
  • Gregory, D L
• Publication Date: 1974-5

Media Info

• Features: Appendices; References;
• Pagination: 106 p.

Subject/Index Terms

• TRT Terms: Force; Performance; Rudders; Torque
• Old TRIS Terms: Rudder forces
• Subject Areas: Design; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00057578
• Record Type: Publication
• Source Agency: Naval Ship Research and Development Center
• Report/Paper Numbers: #4361 R&D Rpt.
• Files: TRIS
• Created Date: Sep 19 1974 12:00AM