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i've been thinking about building a hybrid with Freon instead of hydraulic fluid. The freon gives you a lot more push, and I would use waste heat from exhaust/radiator to heat the freon for higher pressures.
The idea is to keep the size of the tanks small by using liquid freon as the storage medium, but the low pressure of heated freon (500 psi or so) would require a larger motor/pump to work.
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