Visitors to the Astilleros Espanoles display at the Poisedonia show this year were able to see a model of a radically different type of propeller. It is claimed to offer gains in propulsion efficiency in the region of 50%. Such a gain in propulsion efficiency would permit a propulsion plant reduction of about 33%. Called the TVF (Tip Vortex Free) propeller, it is characterized by a new radial distribution of load in the blades that concentrates a very high proportion of the load at the tip of the blades. In a presentation held in conjunction with Posidonia to describe the TVF concept, R.R. Fornells, who heads the central technical department of Astilleros, explains the design and development work that started several years ago. Generally speaking, the gain increases when the block of lines sailing at low speed and fitted with slow running that the best results are obtained on large ships full sailing at low speed and fitted with slow running propellers. As an example Fornells cites the case of a 61,000-dwt Panamax bulker currently offered by AESA with a Sulzer 6RND76M diesel producing 14,400 bhp at 122 rev/min and direct coupled to a conventional propeller. This gives the ship a speed of 15 knots at full-load draft with clean hull and under fine weather conditions, when absorbing 86% of the engine MCR, equivalent to 12,400 bhp. If a TVF propeller is fitted to this ship, the same speed could be reached under the same conditions, but with this propeller absorbing only around 9,8090 bhp, so that a 5L67GFCA B&W engine of 10,900 bhp at 123 rpm could be installed in the ship, instead of the 6RND76M engine. Under these circumstances, the computations indicate an annual fuel saving of $421,200.

  • Availability:
  • Supplemental Notes:
    • See also MRIS Abstract 16-311534 (Dec. 1980).
  • Corporate Authors:

    Simmons-Boardman Publishing Corporation

    P.O. Box 350
    Bristol, CT  United States  06010
  • Publication Date: 1981-1

Media Info

  • Pagination: p. 66-68
  • Serial:
    • Marine Engineering/Log
    • Volume: 86
    • Issue Number: 1
    • Publisher: New York: Simmons-Boardman Publishing Corp.
    • ISSN: 0732-5460

Subject/Index Terms

Filing Info

  • Accession Number: 00329918
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 12 1981 12:00AM