A COMPARATIVE ANALYSIS OF NAVAL HYDROFOIL AND DISPLACEMENT SHIP DESIGN

Hydrofoils are smaller, carry more payload relative to their size, and are faster than conventional displacement ships. The hydrofoil's performance advantage is achieved by incorporating design standards which save weight and space throughout the ship. Differences in the design standards of hydrofoils and displacement ships are described for the main propulsion, electrical and auxillary systems, structure, habitability, and other ship systems by analyzing two hydrofoils, PHM and HOC, and two displacement ships, PG-84 and FFG-7. The design standards of the hydrofoils result in significant weight and volume savings at the expense of decreased ship operability. A displacement ship designed to hydrofoil design standards shows a remarkable improvement in calm-water speed and payload capacity. The comparison of the resultant high-performance displacement ship with the hydrofoil reveals that the high-performance displacement ship has superior range and endurance at slow speeds and payload capacity, but inferior speed and motion characteristics in high sea states. The principal conclusion of the paper is that differences in subsystem design standards must be taken into account in any vehicle assessment since the subsystem standards have a first-order effect on the vehicle characteristics as well as on the overall performance.

  • Supplemental Notes:
    • Presented at SNAME Annual Meeting, New York, N.Y., November 11-13, 1976.
  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  USA  07306-2907
  • Authors:
    • GRAHAM, C
    • Fahy, T E
    • Grostick, J L
  • Publication Date: 1976

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Filing Info

  • Accession Number: 00189442
  • Record Type: Publication
  • Source Agency: Society of Naval Architects and Marine Engineers
  • Files: TRIS
  • Created Date: Apr 25 1979 12:00AM