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first rigorous study of the physics of flight. in , he exhibited a plan for a glider, and he flew it as a model in . over the next five decades, cayley worked on and off on the problem, during which he discovered most of basic aerodynamics and introduced such terms as lift and drag. he used both internal
and external combustion engines, fueled by gunpowder, but it was left to alphonse penaud to make powering models simple, with rubber power. later, cayley turned his research to building a full-scale version of his design, first flying it unmanned in , and in , his coachman made a short flight at brompton...
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