Comparative study of two proposed types of helicopters, (1) machine with single axis and (2) that with separate axis. Paper read before Royal Aeronautical Soc. (See also - no. 371 Nov 25 pp. 379-381; Flight, vol. 12, no. 48, Nov. 25, 1920, pp. 1219-1223, 10 figs)
The problem of the helicopter
Aeronautics
Aeronautics ; 19 , n 372
1920
3 pages
Article (Journal)
English
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