Experiments started in 1905 at Leven Shipyard of William Denny Brothers at Dumbarton on use of propeller as primary lifting device; description of propellers, frame, engine, reduction gear box, controls, weights, and flight testing.
Development of early helicopter
Roy Aeronautical Soc -- J
Royal Aeronautical Society -- Journal ; 58 , n 524
1954
4 pages
Aufsatz (Zeitschrift)
Englisch
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