understanding design ornithopters parachutes another significant invention tension spoked wheel devised order create light strong wheel aircraft undercarriage th century th century cayley 's ideas refined proved expanded important investigators included otto lilienthal horatio phillips branches eurofighter typhoon antonov ''mriya'' largest aeroplane ever built aeronautics may divided three main branches comprising aviation aeronautical science aeronautical engineering aviation aviation art practice aeronautics historically aviation meant heavier air flight nowadays includes flying
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