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Bicycle Bob is correct- quite a few air racers that were usually liquid cooled were able to completely dispose of the radiator by going to "skin-cooling".
What some of you might not know is that the radiators as seen on World War II fighters actually gave a net reduction in overall drag, and a tiny amount of thrust due to the heating of the air passing through the radiator. The North American P-51 is probably best known for this effect, but other planes like the Hawker Hurricane had the same effect.
Most radiators are plastic these days...not exactly a great in my experience.
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