BE-3U

BE-3U is Blue Origin’s restartable, vacuum-optimized liquid-oxygen/liquid-hydrogen engine in the BE-3 family. It uses an open-expander cycle, distinct from the propulsion-module engine’s tap-off cycle. Blue Origin publishes 200,000 lbf (approximately 890 kN) thrust with throttling to 100,000 lbf (445 kN). New Glenn’s 7x2 upper stage uses two BE-3U engines; the larger 9x4 design is planned to use four. These are separate vehicle configurations rather than a single combined engine installation.