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Navy helicopter's rotor struck flight deck after landing produced side-to- side 'vibrations' - The San Diego Union-Tribune
Kaman K-Max Dual Intermeshing Rotor Helicopter Demo – AIN - YouTube
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This Soviet Twin-Rotor Helicopter Design Was A High-Speed Rival To The Mi-24 Hind
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Check out the double-rotor helicopter that could be the US Army's next Black Hawk
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The Osprey: Half-airplane, half-helicopter, totally badass
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Sikorsky's S-97 Raider Helicopter Is a Pirouetting Speedster | WIRED
