==See also==* Coaxial rotor* Contra-rotating==References====External links==*Two Propellers in Tandem Turning in Opposite Ways Give Warplane New Speed" December 1941 article with text, photos and drawing*Aircraft.co.za - The Complete Aviation Reference*Luftfahrtmuseum.com - Further information and pictures of contra rotators for the Fairey Gannet and Shackleton*Video of a Spitfire PR.XIX Startup by Steve Hinton at Chino, California on YouTube
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