Development of the helicopter can be likened to a jigsaw puzzle with the correct placement of each...From The Art of Flying , 1911Paul Cornu's primitive helicopter makes an early tethered proving flight. This image is from card 6...Paul Cornu in his first helicopter in 1907. Note that he is sitting between the two rotors, which...Around 1872 a young French experimenter, Alphonse Penaud, managed to stabilize a rubber-band-powered...1907 The first helicopter rose above the ground in Normandy. On November 13, 1907, Paul Cornu flew...Paul Comu in his first helicopter in 1907 . Note that he is sitting between the two rotors, which...¨¢¾i@2007.10.25.História vrtuľníka Prvý vrtuľník oslavuje 100 rokov.