A version of this article appears in the September 15 issue of Aviation Week & Space Technology. Rocket-engine developments that evolved from preparations for an advanced strap-on booster to lift the largest version of the planned Space Launch System (SLS) could push a prototype 500,000-lb.-thrust U.S. replacement for Russia’s RD-180 to the test stand in 2.5 years, contractors say. Dynetics and Aerojet Rocketdyne (AJR) have joined forces on risk-reduction work growing out of ...

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