Machine comprises upper propeller revolving in normally horizontal plane and propeller in parallel plane 7 ft. below. Each propeller is 51 ft. in diameter. Propellers revolve in opposite directions. (See also - no. 11 Nov 22 1920 pp. 295-297, 4 figs.)
The Hewitt-Crocker helicopter
Aerial Age
Aerial Age ; 12 , n 12
1920
3 pages
1 Fig.
Article (Journal)
English
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