Blown flap

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Blown flaps are a powered aerodynamic high-lift device used on the wings of certain aircraft to improve low-speed lift during takeoff and landing. A definition for powered lift in a white paper prepared by the 1996-1997 Langley Aeronautics Technical Committee, that includes blown flaps, also includes the vectored slipstream from a propeller, suction BLC, the augmentor wing, the jet flap and the circulation control wing. (This definition is different from that in powered lift which covers VTOL).