The Dufaux brothers of Switzerland built an unmanned 23 kg “proof-of-concept” scale model, powered by 3.1 hp motorcycle engine. It was flown as a kite in 1905 and led to a full-scale tilt-rotor machine that was tested in 1909.
Dufaux, Henri & Armand
The Dufaux brothers of Switzerland built an unmanned 23 kg “proof-of-concept” scale model, powered by 3.1 hp motorcycle engine. It was flown as a kite in 1905 and led to a full-scale tilt-rotor machine that was tested in 1909.
All Aero 