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Thanks. The Cd gets short shrift. A good presentation otherwise.
I disagree that the C-pillars overall shape is wrong (2:17). I think the drip rail acts as a vortex generator.
Agreed there is too much underbody flow (2:21). If you look at Beetles modified for high speed, they're stanced nose down so the underbody is a divergent plenum counteracting those vortexes at the rear.
They also have a dog-house box below the rear window where separation would occur.
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