VERTICAL take-off aircraft in the form of jump-autogyros and helicopters have been under sporadic development since the first world war during which a co-axial design attributed to von Karman was used tethered for observation purposes. Only limited success was achieved between the wars due to two main factors:
Some Aspects of Future Helicopter and other Rotorcraft Development
An examination of future trends in the development of V.T.O.L. aircraft and their potential for civil transport operations
Aircraft Engineering and Aerospace Technology ; 40 , 9 ; 47-53
01.09.1968
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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