The regulations do not specifically define what a heat exchanger is. I would submit that if you made two passages that carried some fluid and placed one at the bottom of the duct and one at the top, or maybe one at each side, that you have ducted all of the air that is entering the opening "through" the heat exchanger. This is why these type of rules run wildly out of control and the regulation creep that frustrates everyone exists.
I'm curious to know how the engine is cooled now the front radiator has been removed.
(and yes, I know this is an old thread).
Racer Russ
Palm Coast, FL
i think this is precisely correct, i did some work with pratt and whitney on the aero of my GTP car and i asked the engineer the best way to improve duct work and his answer was simple... " eliminate them " . the long explanation boiled down to that any duct, no matter how well designed is always worse than a streamlined shape for drag for exactly the reasons that dave explains. assuming i understand your question, if you now have a hole in the front of your car where your rad used to be and the rules allow it, , make a properly shaped streamlined, lowest frontal and wetted area shape you can and that will be the lowest drag solution
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