Accession Number:

AD0432457

Title:

EXPERIMENTAL INVESTIGATIONS OF SUPERCAVITATING HYDROFOILS WITH FLAPS,

Descriptive Note:

Corporate Author:

GENERAL DYNAMICS/CONVAIR SAN DIEGO CALIF

Personal Author(s):

Report Date:

1963-12-01

Pagination or Media Count:

155.0

Abstract:

This report presents smooth-water towing basin test data for two zero-dihedral supercavitating hydrofoils of aspect ratio 3.0, mounted by a single center strut and fitted with various sizes of split trailing-edge flaps. Measurements were made of hydrofoil and flap forces and moments over a wide coverage of parameters. The near-optimum flap size for a modified Tulin twoterm foil giving maximum foil lift is shown to be flap chord equal to 310 of foil chord and flap span equal to 910 of foil span. Pressure mapping of the foil lower surface indicates that lower surface lift coefficients are essentially independent of speed, and that more than 50 of the foil lift comes from the upper surface for cavities which are only partially fed with atmospheric air. Data extrapolated to a cavitation number of zero are shown to agree with theory by Johnson, extended by Lin to cover the case with flaps. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE