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Old 05-07-2020, 05:41 PM   #5 (permalink)
Master EcoModder
Join Date: Nov 2017
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A longer extension that continues angled downwards will improve drag but increase rear lift. One that rises will not give the same drag reduction but will reduce rear lift.

Porsche recently released some good data on this for their Cayenne:

Modifying the Aerodynamics of Your Road Car

"Your book is unique! It was high time that someone covered vehicle aerodynamics through the practical eyes of someone like you."

- Dr Wolf-Heinrich Hucho, the founder of modern vehicle aerodynamics
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