Rotol Airscrews Ltd, have evolved what is claimed to be first feathering "constant speed" contra-rotating propeller unit propeller driven by single engine and with pitch changing mechanisms interconnected to operate as single unit. See also Engineering Index 1941 p 58.
Rotol contra-rotating airscrew
Aircraft Eng
Aircraft Engineering ; 14 , n 156
1942
2 pages
Aufsatz (Zeitschrift)
Englisch
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The Rotol Contra-Rotating Airscrew
Emerald Group Publishing | 1942
Engineering Index Backfile | 1940
Engineering Index Backfile | 1946
Engineering Index Backfile | 1947
Engineering Index Backfile | 1944