Blue Origin’s BE-4 engine will be used on the company’s New Glenn launcher and the first stage of United Launch Alliance’s Vulcan Centaur. It burns liquefied natural gas (methane) and liquid oxygen with an oxygen-rich staged combustion cycle, producing 2.4 meganewtons (550,000 pounds-force) of thrust at sea level. This test includes gimbaling the engine to simulate steering during flight.
This is a more conservative design than SpaceX’s Raptor 2 developed for Starship. The BE-4 operates at a chamber pressure of 134 bar, while Raptor 2, with its full-flow staged combustion cycle, runs its chamber at 300 bar with a goal of up-rating to 330 bar in the future, providing a sea level specific impulse of 330 seconds. Blue Origin has not disclosed the specific impulse figure for the BE-4.