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I've thought about this idea for a boat: Water is ~800 X denser than air, so would carry away heat faster/better. With an aluminum hull, make a jacket at the bottom, then pump the coolant over it, transferring the heat to the alu. hull skin and on into the outside water.
On an aircraft, could use the aluminum skin as radiator.
However, if Mr. Crowder gets his way, we'll have water injection directly into the engine cylinder in a 6 cycle arrangement, obviating radiator and coolant.
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