Sikorsky Gathering Data To Expand SB>1 Defiant’s Flight Envelope In Additional Test Flights (Updated)

Boeing and Sikorsky are gathering more propulsion system data on the ground to support further flight testing of their SB>1 Defiant advanced compound helicopter. After three successful flight tests, starting with the helicopter’s first flight in March 2019, the two firms are making tweaks to expand the helicopter’s flight envelope.