U.S. Patent Specifications

In an aeroplane having a wing extending from each side thereof, spanwise extending openings in the upper surfaces of said wings, means in each wing to expel gas at high velocity from within said wing through one of said openings located in said wing, each of said means comprising a plurality of pipes extending span‐wise of said wing in juxtaposition with one of said openings, each of said pipes having a slot therein and being independently rotatable from a first position in which said slot expels gas through said one of said openings substantially perpendicularly to the normal air flow and a second position in which said slot expels gas through said one of said openings parallel to and in the direction of the normal air flow, and means to supply gas under pressure to said pipes.