Boundary layer scoop for the enhancement of Coanda effect flow deflection over a wing/flap surface

Claim 1

In a short takeoff and landing aircraft having a jet engine mounted above and forward of the wing so as to blow over the upper surface of the wing, and an extendible downwardly curved flap located at the rearward edge of the wing behind said engine which, when extended, effectively forms a downwardly curved extension of said upper surface, whereby the exhaust gases of the engine attach to the upper surfaces of the wing and extended flap due to the Coanda effect, resulting in a downward deflection of the engine exhaust gases and a large vertical component of thrust, means for preventing separation of the exhaust gases from said surfaces due to decreased velocity in the boundary layer of the exhaust gas flow, said means comprising a scoop located ahead of said flap and transversely of the gas flow and extending above the upper surface of the wing by an amount not exceeding the thickness of the boundary layer, said scoop communicating with the bottom surface of the wing and acting to remove the boundary layer gases alone and discharge them beneath the wing.