
First flight of the SB-1 Defiant compound helicopter prototype has been pushed to 2019, officials from program partners Boeing [BA] and Lockheed Martin [LMT] announced Dec. 12.Sikorsky, which developed the underlying X2 technologies on which the Defiant is based, has long publicized 2018 as the year the Black Hawk-sized Defiant would first leave the ground.The aircraft has been completely built, but will not fly until early 2019, Rich Koucheravy, Sikorsky’s director of business development for Future Vertical lift, told reporters…