Aerojet Rocketdyne’s merger leaves the company with two entries in the NASA competition for a propulsion system to power advanced strap-on boosters for the heavy-lift Space Launch System (SLS) in development, and the company apparently will keep both in play until the market makes a choice. Aerojet has been building on work with the U.S. Air Force to propose a 1-million-lb.-thrust, hydrocarbon-fuel engine designated the AJ-1E6 for the NASA application, which would use four of the staged ...

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