Scaled Composites is in final preparations for powered flight tests of Virgin Galactic’s SpaceShipTwo (SS2), following completion of the glide-flight envelope at Mojave, Calif. The milestone means the suborbital spacecraft remains on track for the start of rocket-powered flights in the last quarter of this year, with passenger flights provisionally planned to begin by the end of 2013. The envelope clearance for airspeed, angle-of-attack, center-of-gravity (CG) and structural loads was ...


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