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Creating flow seperation, ie spoiling the attached flow, wing effect and the high speed lift at the rear.

 

A couple great references:

Aerodynamics of Road Vehicles, Ahmed, Syed R., Et Al.  - The bible

Race Car Aerodynamics, Katz, Joseph - The guru

 

Yep, non rolling road floor tunnels do not model true open road conditions.  The results given would create a very unstable platform at speed with what a quick calc indicates as a negative static margin.  Center of pressure in front of Center of gravity, not good for recovery of any slewing or high speed driving in a cross wind:eek:.


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