With a full bellypan, the airdam and side skirts are redundant. The underbody is a plenum with one moving and one stationary wall (ignoring in/out the sides). More road clearance can be helpful but it means more tires exposed and bad transient response in corners.
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Originally Posted by jcp123
I had to dig up how they were supposed to work.
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Thanks, I thought about that example, but I went with the first thing I could find. How about Morelli Urban Car:
The rear wheels pump air over the brakes and then into a duct to the Annular truncation, right where it would otherwise be disrupted by flow from the wheels. Helpful patent drawings.
An improvement to devices for reducing drag in vehicles