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The Demon is a UAV designed by BAE Systems, as part of its "FLAVIIR" project. It has a novel aerodynamic control system which uses engine exhaust and bleed air to provide the aerodynamic forces usually provided by flaps, ailerons and elevators.
It has been called the world's first "flapless" plane.
It first flew, from Barrow/Walney Island Airport, off the coast of Cumbria, UK on 17 September 2010.