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Old 02-02-2022, 03:59 PM   #18 (permalink)
aerohead
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Rn

For typical passenger cars, subsonic critical Reynolds number would be achieved by 20-mph, the coefficient of drag would become fixed, and remain so until compressibility effects would arise in transonic flow, at around 250-mph, in standard air.
There are online sources for the Rn calculation, based upon structure length and velocity, at standard air.
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