This helicopter was built to perform the first “kilomètre en circuit fermé” 50,000 francs challenge of Deutsch and Archdeacon. The challenge was won by Farman two years later.
The Santos-Dumont No.12 was a bamboo framework hélicoptère designed and built during 1905/06 at Neuilly St. James. It had two rotors and a propeller, powered by a 24 hp Antoinette V-8.
The apparatus was abandoned soon after mechanical tests revealed inherent flaws in the transmission of power to the contra-rotating rotors.
All Aero 