A FLAP FOR AN AIR DUCT OUTLET FOR A WATERCRAFT

摘要

A flap (1) in combination with a watercraft having at least one duct (10) for the passage of a gas to a surface of the watercraft, located below the waterline, wherein the flap (1) is pivotally mounted at the duct outlet (2) and is movable between an open position and a closed position. In use, the flap (1) is in the closed position when the watercraft is travelling forward at low speed so as to substantially prevent water impinging on a rear peripheral region (9) of the duct outlet (2), and moves to an open position when the watercraft's speed increases.