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This Soviet Twin-Rotor Helicopter Design Was A High-Speed Rival To The Mi-24 Hind
Have any other countries built a twin rotor helicopter like the Chinook? If so, was it successful? - Quora
K-MAX Helicopter With Two Crossing Rotors Is Lighter And More Efficient - YouTube
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Sikorsky tests radical dual rotor helicopter that can reach 276 mph | Daily Mail Online