ULA Leaning Toward BE-4 Engine for Vulcan as Crucial Engine Tests Loom

BE-4 staged combustion testing (Credit: Blue Origin)

In what is likely a surprise to no one, United Launch Alliance’s CEO said this week the company is leaning toward selecting Blue Origin’s BE-4 engine in the first stage of its new Vulcan rocket — providing upcoming engine tests go well.

That would leave rival Aerojet Rocketdyne and its AR1 engine without a booster to fly on.

In an interview during the 33rd Space Symposium here, Tory Bruno said that tests of the BE-4 engine, scheduled to begin “very soon” at Blue Origin’s test site in West Texas, are the last major hurdle the engine must clear before ULA decides to use it on Vulcan.