The J a highenergy engine

While the F-l used conventional kerosene-type fuel, the J-2 improved its performance through the use of relatively exotic liquid hydrogen, which nearly doubled its efficiency. Despite being more efficient, it could not match the raw power levels attained by the F-l, making it more suitable for an upper stage. A single engine could balance over l00 tonnes and it could be restarted in space. It traced its origins to work done in the 1950s to create a hydrogen-burning rocket engine but its development funding came solely from NASA who wanted the inherent benefits of hydrogen applied to its Saturn vehicles.

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