PERFORMANCE PREDICTION AND SOME RELATED PROBLEMS

Some methods of performance prediction available to the designer of fast patrol craft are briefly reviewed. They include:-- a new microcomputer program marketed by the Wolfson Marine Unit <at Southampton University>, for propeller design and gearbox ratio; systematic series data from model tests, for both round-bilge and chine boats, from such establishments as the NMI and the Davidson Laboratory; power estimation by using Barnaby's K factor or by the more recent microcomputer-aided regression analysis techniques <a Wolfson Unit program package includes a prediction for hard-chine craft in the planing regime>; and model tests. Calculation procedures have their drawbacks, and model testing must be considered the most reliable aid to performance prediction. It enables the investigation of power, trim, wetness and longitudinal dynamic stability of craft that depart widely from systematic series or other established forms, and at this stage the power requirement can often be reduced by choice of LCG, modification of afterbody, and measures against spray wetting. Spray-suppressing knuckles, trim control, afterbody design, and model tests of seakeeping and directional properties are briefly discussed. Some precautions that should be taken throughout the design process are mentioned.

  • Supplemental Notes:
    • Combat Craft, 1 <1983>, p.186 <Sept.> (2 pp., 1 ref., 1 tab., 1 graph, 2 phot.)
  • Authors:
    • Flewitt, J R
  • Publication Date: 1983

Language

  • English

Subject/Index Terms

  • Subject Areas: Marine Transportation;

Filing Info

  • Accession Number: 00685280
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM