Air Force Funds Both AR1 and BE-4 Rocket Engine Development to Replace ULA’s Russian RD-180

BE-4 methane engine components undergo hot fire test at the Bezos west Texas test site. Photo Credit Blue Origin

The U.S. Air Force (USAF) decision to continue funding both the Aerojet Rocketdyne AR1 and the Blue Origin BE-4 engines will end United Launch Alliance (ULA) dependance on the Russian RD-180 for the Atlas-V rocket [...]