LOS ANGELES — Test pilots pushing Virgin Galactic’s SpaceShipTwo (SS2) toward a planned suborbital space flight in the coming months report the vehicle is rugged and stable, without any of the potential transonic flutter issues that could have bedeviled the design. Although the subsonic buildup test flights unearthed some unexpected results before the start of powered flights in April, aerodynamic modifications have proved effective during the vehicle’s early supersonic flights ...


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