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Abstract

Presented is an improved concept airfoil, or more properly called fluid dynamic foil, that promises coefficients of lift several times better than present day airfoils or hydrofoils. This is accomplished by use of a rotary Coanda fluid accelerator that is part of the boundary of a high camber or fat airfoil shape. Acceleration of oncoming fluids over the low static pressure side of the airfoil by the rotary element not only decreases the static pressure thereby increasing lift but also improves flow characteristics over the low static pressure side of the airfoil which reduces or eliminates flow separation and its associated turbulent drag effects. Alternative ways to eliminate the flow separation are also presented as well as are ways to control the angle of attack of the airfoil. The concept presented is applicable to aircraft wings, rotary wings such as used on helicopters, hydrofoils, wind and water turbine blades, and the like.

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First Claim