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In September 2014 ULA selected BE-4 as the main engine for the Vulcan launch vehicle. Vulcan is a successor to the Atlas V, and BE-4 would replace the Russian-made RD-180 engine. [15] Blue Origin said that the "BE-4 would be 'ready for flight' by 2017". [7] Blue Origin indicated that they intend to make the engine available to companies beyond ...