Coaxial rotors - Wikipedia
Have any other countries built a twin rotor helicopter like the Chinook? If so, was it successful? - Quora
GREAT RC MODEL HELICOPTER DOUBLE ROTOR BOEING-VERTOL CH-47 CHINOOK INDOOR FLIGHT!! - YouTube
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This Soviet Twin-Rotor Helicopter Design Was A High-Speed Rival To The Mi-24 Hind
Boeing CH-47 Chinook - Wikipedia
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Sikorsky tests radical dual rotor helicopter that can reach 276 mph | Daily Mail Online
Sikorsky tests radical dual rotor helicopter that can reach 276 mph | Daily Mail Online
CH-47 CHINOOK IS A TWIN-ENGINE, TANDEM ROTOR HEAVY-LIFT HELICOPTER. - YouTube
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Tandem rotors - Wikipedia
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