Blue Engines

Rocket Engines Designed for Reuse

Blue Engines

Our Approach to Engines

Operationally reusable rockets demand high performance engines capable of deep throttling for soft landings. Built for multiple uses, our family of engines is powering the next generation of rockets for commercial, civil, national security and human spaceflight.

Blue Engines are designed, developed and manufactured at our headquarters in Kent, Washington. We’re now preparing for serial production of our most powerful engine, the BE-4, in Huntsville, Alabama. All our engines and propulsion subsystems are thoroughly tested and qualified in Van Horn, Texas.

The booster expels pale fiery exhaust and kicks up dust as it descends through the clouds towards the pad.



The BE-3 is the first new liquid hydrogen-fueled rocket engine to be developed for production in America in over a decade.



The first ox-rich staged combustion engine made in the U.S. will power the next generation of American orbital rockets.

BE-4 engine nozzles on the factory floor in Kent, Washington.



BE-7 is an additively manufactured, high-performance, dual-expander cycle engine, generating 44.5 kN (10,000 lbf) thrust.

Blue's Engines

Development History

Engine Propellant Thrust
BE - 1 Peroxide 9 kN (2,000 lbf) at Sea Level
BE - 2 Kerosene + Peroxide 140 kN (31,000 lbf) at Sea Level
BE - 3PM Liquid Hydrogen + Liquid Oxygen 490 kN (110,000 lbf) at Sea Level
BE - 3U Liquid Hydrogen + Liquid Oxygen 710 kN (160,000 lbf) in Vacuum
BE - 4 Liquefied Natural Gas + Liquid Oxygen 2,400 kN (550,000 lbf) at Sea Level
BE - 7 Liquid Hydrogen + Liquid Oxygen 44.5 kN (10,000 lbf) in Vacuum