A hydrodynamic validation study of the concept of the mixed foil has been conducted. A mixed foil is a streamlined hydrofoil equipped with a flap or other device which, above a certain speed, can be activated so as to change the flow around the foil into a supercavitating flow. At take-off and at moderate speeds, a mixed foil is operated as a subcavitating foil; at high speeds, it is operated as a supercavitating foil. During high-speed operations, a reduction in the wetted planform area of a mixed foil is proposed. The present study produces a design outline for the mixed foil and identifies essential problems which should be studied in the future. The analysis is illustrated by using hydrofoils with plano-convex sections. The lift-to-drag ratios at takeoff and at 45-knot and 83-knot cruising speeds are obtained.
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June 01 1976
A Validation Study of the Mixed-Foil Concept for High-Speed Hydrofoils
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Wang, D. P., and Young T. Shen. "A Validation Study of the Mixed-Foil Concept for High-Speed Hydrofoils." J Ship Res 20 (1976): 85–94. doi: https://doi.org/10.5957/jsr.19126.96.36.199
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