SOME PRACTICAL CONSIDERATIONS IN REDUCING REQUIRED POWER FOR SHIPS

Various methods of reducing the propulsive power required by screw-propelled ships are considered. These include reducing surface roughness of hull and propeller, selecting optimum hull proportions and fullness for reduced power operation, enlarging the diameter of the propeller together with reducing propeller RPM, use of a ducted propeller rather than an open propeller, possible use of contra-rotating propellers, alternative modes of operation of twin screws at reduced power, reduction of above-water hull and superstructure resistance due to air drag are discussed in this report.

  • Corporate Authors:

    National Maritime Research Center, Kings Point

    United States Merchant Marine Academy
    Kings Point, NY  USA  11024

    Webb Institute of Naval Architecture

    Glen Cove, NY  USA 
  • Authors:
    • Hamlin, N
  • Publication Date: 1977-10

Media Info

  • Pagination: 61 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00175136
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NMRC-KP-161
  • Files: TRIS
  • Created Date: Apr 26 1978 12:00AM