BE-7

The Blue Engine 7 is a liquid hydrogen/oxygen dual expander cycle engine for use with the Blue Moon family of lunar landers. The company utilizes additive manufacturing in the development process and it is meant to generate 10,000 lbf of thrust, serving as both the ascent and descent engines for Blue Moon.

History
Following the commencement of the Artemis Program the company sought to independently develop a lunar lander, the 'MK1' and accompanying engine. The BE-7 test phase began in 2019 with additional hot fire testing in 2020 at the Marshall Space Flight Center. Following selection for NASA's second Human Landing System, which Blue Origin calls 'MK2', the company announced that the BE-7 engine will be used for both landers. A demonstration flight of the MK1, planned for 2025 is on track and will debut the BE-7 engine. In 2024, the company announced vacuum cell testing was being conducted on the engine at the Edwards Air Force Base.

Technical specifications
The BE-7 utilizes liquid hydrogen and liquid oxygen propellants in a dual expander cycle generating up to 10,000 pounds-force of thrust which can be throttled to 2,000 pounds-force. The company hopes that the propellants can, in the future, utilize ISRU and be produced from ice in the polar regions of the moon. It will also be used to power the transfer element, the Cislunar Transporter in development by Lockheed Martin.