Writer explains conditions under which a helicopter is capable of flight, and what altitudes it can reach.
The possibilities of the helicopter
Die Moglichkeit des Schraubenflugzeuges
Zeitschrift fur Flugtechnik und Motorluftschiffahrt ; 11 , n 14 ; p 207-209
1920
3 pages
1 Fig.
Article (Journal)
German
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