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SB-1 Defiant Readies for Third Flight, V-280 Continues Expanding Flight Envelope

Dan Parsons By
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SB-1 Defiant Readies for Third Flight, V-280 Continues Expanding Flight Envelope

NASHVILLE — The Boeing [BA]-Sikorsky built SB-1 Defiant technology demonstrator is set to undertake its third flight in the next 10 days to accomplish frequency sweeps and to check several other areas, including the aircraft's active vibration control system and its hover out of ground effects profile. "The plan is we'll have another flight in a week and a half," Bill Fell, the Sikorsky experimental test pilot for the SB-1, said Apr. 15 during a briefing at the Army Aviation…

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