ULA Picks Aerojet Engine For Vulcan Upper Stage

CAPE CANAVERAL—United Launch Alliance (ULA) has not yet announced whether it will stick with original plans to buy Blue Origin BE-4 engines to power the first stage of its Vulcan rocket or switch to Aerojet Rocketdyne’s AR1. But when Vulcan debuts in 2020, its Centaur upper stage will be powered by...

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