Work of O. von ASBOTH reviewed with particular attention to development of Asboth A.H.X.; retractable tricycle undercarriage is one feature of this model; 39 ft diam rotor blades are set rigidly at angle corresponding to resultant between lift and centrifugal force and have no flapping hinges; structural considerations discussed.
Real helicopter progress
Flight
Flight ; 36 , n 1600
1939
3 pages
Article (Journal)
English
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