Propulsion for planned NASA heavy lifter will follow a flat-budget development pace
NASA will store some rocket engines, slow work on others and study still more as it struggles to squeeze the heavy-lift Space Launch System (SLS) Congress has ordered into a flat $3 billion annual budget for development. Early flights of the SLS will use surplus space shuttle main engines (SSMEs) and, as side-mounted strap-ons, the five-segment solid-fuel motors developed for the terminated Ares I crew launch vehicle's first stage. The J-2X upper-stage engine, which once was the ...
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