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I believe I read somewhere the air speed close to the radiator is 1/6th of the velocity of the vehicle. Which, if true, means that....
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I can't confirm that, but it's been said that the opening of a properly ducted shroud should be 1/6th the area of the radiator itself.
One could perform a test with an electric fan, but before or after the radiator it would be like trying to breath with a pillow on your face.