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 Aeronautics, vol. 19, nos. 371 and 372, Nov. 25 and Dec. 2, 1920, pp. 379-381 and 392-394)
The problem of the helicopter
Flight
Flight ; 12 , n 48
1920
5 pages
10 Figs.
Article (Journal)
English
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