Pioneering Convertiplane

Gerard Herrick tried to have the best of both worlds—fixed-wing and rotary-wing—with his HV-2A. The concept of rotary-winged aircraft goes all the way back—on paper, at least—to Leonardo da Vinci, but even after the Wright brothers achieved  controlled flight in 1903, rotary-winged flight remained elusive. In 1919 Spanish inventor Juan de la Cierva came up …

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