Data for 172 ship model correlations for new single screw merchant ships whose models have been run in the St. Albans tank were analysed by multiple regression and graphical methods, and four predicting equations deduced from these data are presented. Three of these equations are independently tested against 174 correlations for ships whose correlation models have been run in No. 1 tank of the National Physical Laboratory and whose trials were carried out by the British Ship Research Association. This latter sample contains correlations for trials after service as well as those for acceptance trails. The equations contain quantitative allowance for resistance and propulsion scale effects, ship hull surface condition, weather and water depth on trial, and ship speed. They are shown to be capable of prediction of power to within plus or minus 10% with mean error of less than 5% and of rate of propeller revolutions to within plus or minus 2.5% with mean error of the order of 1%. These accuracies are superior to any other known method of performance prediction. More than marginal improvement seems likely if attention is given to standardization and improvement of the accuracy of ship power measurement. Variations of correlation factors with some of the quantities needed to predict them are given in an appendix.

  • Availability:
  • Corporate Authors:

    Royal Institution of Naval Architects

    10 Upper Belgrave Street
    ,   United States 
  • Authors:
    • Scott, J R
  • Publication Date: 1973-7

Media Info

  • Features: References;
  • Pagination: p. 149-171
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00051008
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Feb 20 1974 12:00AM