Split Flap - The rear portion of the lower surface of the wing aerofoil hinges downwards from the leading edge of the flap, while the upper surface remains immobile.Plain Flap - The rear portion of the wing aerofoil rotates downwards on a simple hinge arrangement mounted at the front of the flap. ![]() The following are descriptions of some of the more common flap designs: Large aircraft sometimes incorporate more than one type, utilising different flap designs on the inboard and outboard sections of the wing. There are many different flap designs and configurations in use. These factors result in an improvement in takeoff and landing performance. ![]() ![]() When extended, they increase the camber and, in most cases, the chord and surface area of the wing resulting in an increase of both lift and drag and a reduction of the stall speed. Flaps are a high lift device consisting of a hinged panel or panels mounted on the trailing edge of the wing.
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