The 5-2 high-energy liquid propellant rocket engine (~i~. l), a large engine producing 200,000 pounds of thrust at altitude conditions, burns liquid hydrogen and liquid oxygen to produce the necessary high specific impulse for practical space use. Rocketdyne, a Division of North American Aviation, Inc., is developing the engine for the George C. Marshall Space Flight Center, Xfi. The first use of the engine will be in the upper stages of the Saturn vehicles. Five engines will be used for the second, S-I1 stage of the Saturn V, and one will power the S-IVB third stage of the Saturn V and S-ISTI second stage of 'the Saturn IB; Original is a photocopy on onion skin.
