Gouge flap

The Gouge flap, is a type of aircraft flap, which moves on a track when raised or lowered; in level flight. Invented by Arthur Gouge of Short Brothers in 1936, it allows pilots to increase both the wing area and the chord of an aircraft's wing, thereby reducing the stalling speed at a given weight. This provides benefits including a shorter take-off distance for any given load, a shorter distance to achieve a specific height and a lower take-off speed. However, the Gouge flap system, in spite of its use on production aircraft like the Short Sunderland and the Short Stirling, has only been used on aircraft produced by Short Brothers.

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