VIDEO: Sikorsky-Boeing Defiant Coaxial Helicopter Lifts Off

The SB-1 Defiant coaxial compound helicopter prototype, built by a Sikorsky-Boeing team, broke contact with the ground on March 21 for the first time. Neither company released much information about the flight, although a video of the event at Sikorsky's West Palm Beach, Florida, flight test facility shows the aircraft in a low-level hover over…

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