This report discusses the measured performance of the TAP-2 hydrofoil, a 'mixed foil' designed to operate fully wetted at takeoff (35 knots) and which, through a change in geometry, can fly fully ventilated at cruise speed (60 knots). At takeoff, TAP-2 has a lift-to-drag ratio of 13 at the design lift coefficient; the corresponding figure for cruise speed is between 7 and 8. Predictive extrapolation to prototype scale is discussed and contrasted with our present understanding of the scaling laws associated with ventilation. (Author)

  • Corporate Authors:

    David Taylor Naval Ship R&D Center

    Ship Performance Department
    Bethesda, MD  United States  20084
  • Authors:
    • Lafrance, P
  • Publication Date: 1978-6

Media Info

  • Pagination: 102 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00197759
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: DTNSRDC/SPD-0843-01 Dept Rpt.
  • Files: TRIS
  • Created Date: Sep 15 1979 12:00AM