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 Flight v 65 n 2347 Jan 15 1954 p 73)
Rotary wing aircraft development
Eng J
Engineering Journal ; 37 , n 5
1954
Article (Journal)
English
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Rotary wing aircraft development
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