ULA Considers AR1 A Backup To BE-4 Engine

Credit: Atlas V: ULA
United Launch Alliance (ULA) is using U.S. Air Force funds to integrate the Aerojet Rocketdyne AR1 engine into a kerosene-fueled variant of its planned Vulcan launch vehicle, but will use it only if Blue Origin falls seriously short of a development schedule that currently would hot-fire the methane...

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