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Contra-rotating propellers - Wikipedia
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File:Torpedos with contra-rotating propellers to minimize heeling moment - Museum of Great Patriotic War (8601790818).jpg - Wikimedia Commons
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 &
Are these propellers *counter* rotating, or *contra* rotating? Counter- rotating means one propellor per engine, with each engine spinning the prop in... | By Flight Experience Sydney - Facebook
Vortex shedding structure around the blade at single and... | Download Scientific Diagram
Contra-rotating propellers - Wikipedia
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Contra Rotating Propeller - Propulsion System (Motor, Gears) - FOIL.zone