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Amazon.com: CRM2413A Brushless Metal Motor Contra-Rotating Motor CRM2413 1300KV for Airplane Models w/Prop Adapter Two propellers Work with Two ESC Bring Strong Power Supply,w/Large Thrust for RC Flying Models : Toys &
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Contra-rotating propeller and other concepts. - Hobby Squawk RC Forum for Airplanes, Boats, Cars, Helicopters, Tanks, and Trucks
![File:Torpedos with contra-rotating propellers to minimize heeling moment - Museum of Great Patriotic War (8601790818).jpg - Wikimedia Commons File:Torpedos with contra-rotating propellers to minimize heeling moment - Museum of Great Patriotic War (8601790818).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/e/e1/Torpedos_with_contra-rotating_propellers_to_minimize_heeling_moment_-_Museum_of_Great_Patriotic_War_%288601790818%29.jpg)