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They do that in other places.

As I heard the tale, on the Standard Missile, they don't recirculate the hydraulic fluid, they just spit out as the missile flies. It's a wonderful engineering solution.





And on the Falcon 9, the hydrocarbon fuel is used as hydraulic fluid, then just dumped back into the fuel tank.

And the SR-71 uses its fuel as coolant.

"There was a lot we couldn't do, but we were the fastest kids on the block..."




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