By David Crane defrev (at) gmail (dot) com April 28, 2011 Last updated on 5/08/11. The Sikorsky X2 Compound Coaxial Helicopter Technology Demonstrator Aircraft has been receiving a significant amount of positive media attention, lately, and for good reason. The X2 is a very interesting and seemingly highly-capable/high-speed dual-rigid-rotor compound helicopter prototype that achieved 250
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