Hull roughness has an appreciable effect upon the flow of sea water over the underwater hull. Its relationship with skin friction and the boundary layer is briefly discussed. Hull roughness can be divided into micro and macro roughness factors; the former includes steel and paint profiles whilst the major component of the latter is biological fouling. Average hull roughness readings have been determined for a large number of vessels and the economic effects have been outlined. The performance of conventional antifouling paints shows serious limitations in expected life due to exponential decay in leaching rate and in the development of microroughness due to the leaching mechanism. In addition intercoat adhesion of subsequent coats of paint is generally poor, leading to peeling and macro-roughness. The newly developed organotin copolymer antifoulings operate by a different mechanism with essentially a straight line leaching rate/time relationship, hence giving an appreciably longer life. In addition surface smoothing also occurs.

  • Supplemental Notes:
    • Shipboard Energy Conservation '80, presented by the New York Metropoliton 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:
    • Hartley, R A
  • Publication Date: 1980

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00322772
  • Record Type: Publication
  • Report/Paper Numbers: Session III-B
  • Files: TRIS
  • Created Date: Nov 29 1980 12:00AM