As machine climbs into higher altitudes and more rarified air is encountered, blades automatically increase their pitch so that constant load is kept on motor. (See also Aerial Age vol. 12, no. 24, Feb. 21 1921 pp. 610-711, 2 figs)
Parker variable pitch air screw
Flight
Flight ; 13 , n 15
1921
2 Figs.
Article (Journal)
English
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