The free vortex in the slipstream of a screw propeller causes propeller efficiency losses from both tip and hub vortices. Special propeller designs have attempted to eliminate the tip vortices, but little has been done to eliminate the hub vortex and its effects. A new device developed in Japan to weaken this hub vortex is described. It is called the Propeller Boss Cap Fin (PBCF) and has been installed on the car carrier MERCURY ACE. The PBCF is similar to a small propeller made from a solid casting. It is fitted to the aft end of the propeller, replacing the boss cone. Numerous tests have shown its use to result in efficiency improvements of from 3 to 7 per cent.

  • Supplemental Notes:
    • Journal article
  • Publication Date: 1988-5

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Filing Info

  • Accession Number: 00655587
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM