Back in the 70's I was enamored of Can Am racing and had the idea of using a more viscous gas to lubricate the surface of the car with strategically placed air jets, seems that pure nitrogen is slicker than regular air, , later found out many electric generators use nitrogen to fill their cases and reduce air drag, might be some other reason also but pretty radical , might be possible now to use a bank of pressurized air to inject onto hollow spaces on the air flow,
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