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Upper Stage Engine
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Upper Stage Engine

January 7, 2010
Powered by liquid oxygen and liquid hydrogen, the J-2X is an evolved variation of two historic predecessors: the powerful J-2 upper stage engine that propelled the Apollo-era Saturn IB and Saturn V rockets in the 1950s and 1970s, and the J-2S, a simplified version of the J-2 developed and tested in the early 1970's but never flown. The J-2X will measure about 185 inches long and 120 inches in diameter at the end of its nozzle. It will weigh approximately 5,300 pounds. With 294,000 pounds of thrust, the engine will enable the Ares I upper stage to place the Orion crew exploration vehicle in low-Earth orbit.