General principles are outlined for monitoring the speed and power performance of ships in service. An example of monitoring is given to illustrate the method and value of applying the principles. The example compares the performance of two sister containerships for which speed power curves were measured during a round voyage. The difference between the two speed and power curves is related to the hull roughness. The energy expenditure per nautical mile is calculated for the two ships. It is shown that hull roughness costs the operator $6,000 per annum per micrometre. Problems of monitoring performance using fuel figures are illustrated and the use of torsionmeters and satellite navigators is considered essential. The optimum speed of the ships is calculated.

  • Supplemental Notes:
    • Shipboard Energy Conservation '80, presented by the New York Metropolitan Section of SNAME, New York, New York, September 22-23, 1980.
  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  United States  07306-2907
  • Authors:
    • Townsin, R L
    • Svensen, T
  • Publication Date: 1980

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00322766
  • Record Type: Publication
  • Report/Paper Numbers: Session 1-C
  • Files: TRIS
  • Created Date: Nov 29 1980 12:00AM