History; illustrated description of different types; Von Baumhauer 1930 helicopter was forerunner of today's single rotor machine; comparison of helicopter vs fixed wing transport; future possibilities of rotary wing aircraft. (see also Eng J v 37 n 5 May 1954 p 570-5, 585)
Rotary wing aircraft development
Flight
Flight ; 65 , n 2347
1954
Article (Journal)
English
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Rotary wing aircraft development
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