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Hubschrauber
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keywords:("Hubschrauber")
A series of flight effected with helicopter on the 15 28 and 29 of Jan 1921
Independent sustentation of an aeroplano in air
Flight tests performed with Oehmichen helicopter in January 1921
Elements of stability calculation for helicopter
New theories on problem of helicopter design
Nouvel Appareil a voilure tournante -- l'helicoptere Florine
Report on design and performance of Focke helicopters developed in Germany
Report on design and performance of Focke helicopters developed in Germany
Report on design and performance of Focke helicopters developed in Germany