United Launch Alliance is considering phased development of a common upper-stage booster for its Atlas V and Delta IV rockets to cut costs and improve manufacturing efficiency in support of the Evolved Expendable Launch Vehicles (EELV) program for U.S. government payloads. Both vehicles use variants of the Pratt & Whitney Rocketdyne RL10, the first U.S. liquid hydrogen-fueled engine when it entered service in 1963. Today’s derivatives are the RL10A-4 for the Atlas V’s Centaur upper ...

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