POLISHING UP PROPELLER PERFORMANCE

The increase in resistance due to hull fouling and roughness and its adverse effect on fuel economy is now well recognised; less attention has however been paid to the condition of the propeller, although it is pointed out in this article that, while the absolute increase in efficiency and resulting improvement in performance is less, the cost-effectiveness of cleaning and polishing the propeller is far greater than that of hull maintenance. Cases are quoted where improvements in fuel consumption of 10% or more have been achieved by cleaning and restoring the propeller surfaces. In addition to these results obtained on ships in service the article presents the results of three case studies performed by the British Ship Research Association using the BSRA computer-based ship simulation model. It is found that the discounted profit/investment ratio of polishing the propeller every 24 months amounts to between 1.5 and 4%. It is also suggested that propeller replacement in order to obtain a propeller better suited to slow-speed steaming conditions is also a good investment alternative.

  • Supplemental Notes:
    • Lloyd's Ship Manager, 4 <1983>, p.18 <Nov.> (6 pp., 3 fig., 3 tab.)
  • Publication Date: 1983

Language

  • English

Subject/Index Terms

  • Subject Areas: Marine Transportation;

Filing Info

  • Accession Number: 00685496
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM