Accession Number : AD0259303

Title :   LINEARIZED THEORY FOR THIN, SUPERCAVITATING HYDROFOILS WITH SPOILER-FLAPS OPERATING AT HIGH SPEEDS BENEATH A FREE SURFACE

Descriptive Note : Technical rept.,

Corporate Author : HYDRONAUTICS INC LAUREL MD

Personal Author(s) : CHEN,C.F.

Report Date : 09 JUN 1961

Pagination or Media Count : 1

Abstract : The linearized problem of flow past a flat plate with a deflected upper flap is solved including the free surface effects. The flow is assumed to detach at the trailing edges of the flap and of the plate leaving an infinite cavity of constant pressure behind. The results are applicable to flaps of arbitrary length, hinged at arbitrary distance from the leading edge and at arbitrary depth. Numerical results are presented to show the effect of depth on the lift and drag coefficients of a trailing edge flap whose chord is 30% of the chord of the plate, the effect of the hinge position of such a flap on the hydrodynamic characteristics of a plate at infinite depth, and the pressure distribution on a flapped plate at infinite depth. The principal results obtained are: as the depth decreases, the flap becomes less effective and less efficient; as the hinge position is moved rearward, the flap becomes more effective and more efficient. (Autho)

Descriptors :   *FLAPS(CONTROL SURFACES), *HYDRODYNAMICS, *HYDROFOILS, DIFFERENTIAL EQUATIONS, DRAG, INTEGRAL EQUATIONS, LIFT, LOAD DISTRIBUTION, MATHEMATICAL ANALYSIS, MEASUREMENT, PRESSURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE