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I believe the famous shneider cup racing airplanes of the thirties , at least some of them used the skin of the plane and evaporative cooling or something along those lines, I think a vent right behind the radiator with maybe a sheild for rain would probably be the best, like and old fashioned cowl vent as used on fifties cars only right behind the rear edge of the radiator or close to it, the air here is going up and pulling a vacumn on the front of the hood on most cars I would think and this allows a bit of air to fill that and kill some lift as well.
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