![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)
File:Torpedos with contra-rotating propellers to minimize heeling moment - Museum of Great Patriotic War (8601790818).jpg - Wikimedia Commons
![The contra-rotating propeller blades on the front of a 1950s Royal Navy Gannet in the Imperial War Museum Duxford Stock Photo - Alamy The contra-rotating propeller blades on the front of a 1950s Royal Navy Gannet in the Imperial War Museum Duxford Stock Photo - Alamy](https://c8.alamy.com/comp/BPN1EY/the-contra-rotating-propeller-blades-on-the-front-of-a-1950s-royal-BPN1EY.jpg)
The contra-rotating propeller blades on the front of a 1950s Royal Navy Gannet in the Imperial War Museum Duxford Stock Photo - Alamy
With counter-rotating propellers on a single engine, are the two propellers geared to different speeds, and is the back propeller less efficient because it is working in the already sped-up air of
Are contra rotating props actually more effective for purposes other than canceling torque? If so, why? - Quora
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