By David Crane david (at) defensereview (dot) com December 27, 2020 Back in 2011 and 2013, DefenseReview (DR) published pieces on the Sikorsky X2 coaxial/dual-rotor compound helicopter technology demonstrator and Sikorsky S-97 Raider dual rotor/coaxial compound helicopter concept, here and here. Well, all these years later, it’s being reported that “the Army is taking its final steps before starting a …
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