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Sikorsky-Boeing SB-1 Defiant Prototype Complete, Except For Main Rotors

Installation of its eight 30-foot-long rigid rotor blades is all the SB-1 Defiant needs to be a complete compound helicopter scheduled for a first flight before the end of the year. “Defiant has been completely built, minus the rotor blades,” Rich Koucheravy, Sikorsky’s future vertical lift director, said Oct. 8 at the Association of the…

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