PETROCSY HELICOPTER
Austrian lieutenant Stefan Petrocsy proposes a remarkable helicopter design in which the cockpit is above the rotating blades : note, too, the balls serving as undercarriage
Picture No
10116750
Media ID
47310047
Size
3312px x 4527px
(2.3MB)
Credit
Mary Evans Picture Library
Source
Cover by an unnamed artist for Science et Vie', July 1921
Date
1921
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Balls Cockpit Helicopters Proposes Remarkable Rotating Stefan Undercarriage
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