The Author draws attention to some anomalies surround the definition and determination of a ship's wetted surface, a parameter which had been used in hydrodynamic work for many years as a reference area in resistance calculations. Since the true developed area of the double-curve ship surface is laborious to calculate, an international model basin conference in 1935 agreed to use the so-called reduced surface in future scientific papers. This reduced or "projected" surface gives a more correct reference area and is much easier to calculate. In spite of this decision, authorities in the field of ship resistance have continued to keep confusion alive concerning the definition of the wetted surface. Added to this, the ship designer making his resistance calculation will find that only a few formulas and diagrams of wetted surface take any notice of the fact that ships may be quite different, and that a bulbous bow or cut-away will influence the result by up to several percent. The Author refers to the work done on a systematically varied series of merchant-ship forms in order to study these problems and produces the major findings from its published FORMDATA reports.

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  • Corporate Authors:

    Benn Brothers Marine Publications Limited

    Lyon Tower, 125 High Street, Colliers Wood
    London SW19 2JN,   England 
  • Authors:
    • Guldhammer, H E
  • Publication Date: 1976-10

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Filing Info

  • Accession Number: 00153106
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: May 11 1977 12:00AM