Accession Number : AD0432457

Title :   EXPERIMENTAL INVESTIGATIONS OF SUPERCAVITATING HYDROFOILS WITH FLAPS,

Corporate Author : GENERAL DYNAMICS/CONVAIR SAN DIEGO CALIF

Personal Author(s) : Conolly,A. C.

Report Date : DEC 1963

Pagination or Media Count : 155

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 3/10 of foil chord and flap span equal to 9/10 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)

Descriptors :   (*HYDROFOILS, CAVITATION), PRESSURE, FLAPS(CONTROL SURFACES), MODEL TESTS, TEST METHODS, MOMENTS, LIFT, DRAG, ANGLE OF ATTACK, AIR, RELIABILITY, TEST EQUIPMENT, VELOCITY, DEFLECTION, LOAD DISTRIBUTION, HYDRODYNAMICS, FLUID DYNAMICS, SPLIT FLAPS

Distribution Statement : APPROVED FOR PUBLIC RELEASE