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Coaxial rotors - Wikipedia
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Dual rotors could make the Defiant one of the world's fastest helicopters
Have any other countries built a twin rotor helicopter like the Chinook? If so, was it successful? - Quora
Have any other countries built a twin rotor helicopter like the Chinook? If so, was it successful? - Quora
Dual rotors could make the Defiant one of the world's fastest helicopters
GREAT RC MODEL HELICOPTER DOUBLE ROTOR BOEING-VERTOL CH-47 CHINOOK INDOOR FLIGHT!! - YouTube
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Boeing CH-47 Chinook - Wikipedia
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Tandem rotors - Wikipedia
Boeing CH-47 'CHINOOK' Helicopter | TANDEM ROTOR HEAVY LIFTER - YouTube
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