Quote:
Originally Posted by E.Roy
My guess on this is that the underbody becomes less important to be smooth if you put a lower air dam on the car to make air go around the car instead of forcing it underneath.
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The idea is to combine both.
The air dam extending down to the lowest point on the chassis, which would determine the frontal area anyway, to divert as much air around the car as possible.
The belly pan mounted on the lowest point of the chassis smooths out whatever air still goes underneath the car.