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Sikorsky tests radical dual rotor helicopter that can reach 276 mph | Daily Mail Online
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Dual rotors could make the Defiant one of the world's fastest helicopters
Dual rotors could make the Defiant one of the world's fastest helicopters
This Soviet Twin-Rotor Helicopter Design Was A High-Speed Rival To The Mi-24 Hind
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Tandem rotors - Wikipedia
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Have any other countries built a twin rotor helicopter like the Chinook? If so, was it successful? - Quora
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