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Old 06-25-2021, 05:55 PM   #599 (permalink)
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Don't forget that if you extend the top edge of the shape past the tailgate you can then add a spoiler without increasing wake area. That is then likely to reduce drag and lift.

Also, you don't necessarily want a beautifully curved surface from the top to the sides, because this will encourage flow around this corner and so likely increase the strength of trailing vortices. The Tesla Model S has low vortex formation off the rear pillars - note their shape.

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