Succcessful series of tests was made by Royal Canadian Air Force on propeller designed by W. R. Turnbull; variation of pitch angle is controlled by small electric motor carried on, and in front of, hub, which rotates blades through suitable train of gearing.
A promising variable-pitch airscrew
Aeroplane
Aeroplane ; 33 , n 19
1927
1 Fig.
Article (Journal)
English
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