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Old 08-28-2020, 07:17 PM   #4 (permalink)
JulianEdgar
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And re the Cadillac. It's not a car I am familiar with, but I see a Cd listed of 0.29. From that, you can be pretty confident of attached flow right down to the trailing edge of the boot lid, and from that, you can be pretty confident of a fair amount of rear lift as the air travels around the curve from the roof to the rear window. (I'd be happy to see some smoke stream pics, if anyone can find them.)

If the car develops at 100mph 30.6-pounds of rear lift, and 40.8-pounds front lift, I'll let someone else find the frontal area and do the calculations for the coefficients of front and rear lift. My guess, and it is only that, is that the figures would be quite different in free air (and not a tiny wind tunnel), but even as they are, you can start getting a feel for how car shapes produce lift.

As to Aerohead's calculations, he is either deliberately muddying the water or is confused. No one is expecting the car to fly - yet another strawman argument of the type that Aerohead is so fond of adopting.
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