ブルーオリジン
Blue Origin began work on a new and much larger rocket engine in 2011. The new engine, the "Blue Engine 4", or "BE-4", is a change for Blue Origin in that it is their first engine that will combust liquid oxygen and liquid methane propellants. The engine has been designed to produce of thrust, and was initially planned to be used exclusively on a Blue Origin proprietary launch vehicle. Blue Origin did not announce the new engine to the public until September 2014.