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Flaps are a high lift device consisting of a hinged panel or panels mounted on the trailing edge of the wing. When extended, they increase the camber and, in most cases, the surface area of the wing resulting in an increase of both lift and drag and a reduction of the stall speed. These factors result in an improvement in takeoff and landing performance.
There are many different flap designs and configurations in use. Large aircraft sometimes incorporate more than one type utilising different flap designs on the inboard and outboard sections of the wing. The following are descriptions of some of the more common flap designs.