Oelimichen No.1
Etienne Oemichen, a young engineer with the Peugeot motor car company, began to experiment with rotating-wing designs in 1920, and in all designed and built six different vertical take-off machines. When the first of these failed to develop enough lift from its twin rotors and 25hp engine to rise off the ground, he added a hydrogen-filled balloon on top of it to give it added stability and lift.
With two rotors of 20.99 ft and weighing 814 lb, it flew for 1 min 40 seconds, and later 5 minutes.
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