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Napier used surface cooling on one of their early Brooklands racers, and the idea was revived for at least one racing aircraft in the 30s. Weight and vulnerability to damage are the main drawbacks. Heat pipes require a pump if the source is not below the sink. Aluminum has the best heat conduction per pound by a healthy margin. An easy way to experiment might involve flattening out the evaporators around old refrigerator freezers.
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There is no excuse for a land vehicle to weigh more than its average payload.
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