The rotational energy that is normally lost in the slipstream of a propeller can be recovered by properly designed pre-swirl vanes, thus improving propulsive efficiency. More recently, asymmetric vanes have been designed that also reduce the circumferential wake variations in the inflow to the propeller, reducing cavitation and vibration. In the experiments described, an asymmetric vane set, designed to reduce the circumferential wake variations caused by an inclined propeller shaft, was tested on a 41-foot USCG twin-screw utility boat. Fuel consumption, shaft torque, RPM and panel accelerations above the propellers were measured for two different propeller designs, with and without vane sets. The vanes produced significant fuel savings over most operating speeds for both types of tested propellers.

  • Availability:
  • Supplemental Notes:
    • Journal article; Reprints paper presented at ASNE Day, 1989
  • Authors:
    • SEDAT, R D
    • Purcell, E S
    • Hervey, C L
  • Publication Date: 1989-5

Media Info

  • Features: References;
  • Pagination: 13 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00657302
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM