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Check out this video of Sikorsky's mock up of it's S-97 high-speed attack/scout chopper. An armed version of the helo would be able to fly at 10,000 feet in 95 degree temperatures and cruise at up to 220 knots per hour, according to Sikorsky. Key to this performance are the coaxial main rotors and the seven foot pusher propeller mounted on the tail.
