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Walk-around of the engine's lube oil tank, which held 20-gallons of oil used to lubricate the turbopump's gearbox. Picture 4 of 6. One change introduced when the S-3D evolved into the H-1 rocket engine was that the gearbox used a mixture of the engine's fuel (RP-1) and Oronite (a lubricant from the H-1's fuel additive blender unit) to lubricate the gearbox. | ||||
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