slotted flaps

slotted flaps

slotted flapsclick for a larger image
A type of trailing-edge flap. These may be single, double, or triple slotted. They form a slot(s) between their leading edge and the inside of the flap well in the wing. The resultant airflow helps to control the boundary layer, resulting in higher maximum lift but not so much increase in drag. The stalling angle also increases considerably.
References in periodicals archive ?
Common types include the Fowler flaps of a Cessna 172, slotted flaps of a Piper Cherokee and split flaps of the Cessna 310.
Fowler and slotted flaps, for example, can produce a considerable performance change when retracted during a steep climb; the culprit is the progressive reduction in lifting area through the return to normal camber and chord--the amount of lift available suddenly decreases.
The slotted flap also pivots downward without moving aft, opening a slot between the flap leading edge and the wing through which air flows to help maintain airflow over the top of the wing, further improving lift at lower speeds.