Quote:
|
Originally Posted by Frank Lee
I've read there is a sweet spot for ground clearance; lowering typically improves aero but there is a point at which further lowering starts to make the aero worse again.
|
My guess is that this because shear forces increase the narrower the gap between two moving surfaces is (car bottom and road):
https://en.wikipedia.org/wiki/Hagen-Poiseuille_equation
Maybe this effect could be reduced if you had a snowplough shaped lip underneath the belly pan which directs more air away from the cars underside? (And then you may also need side skirts to prevent air from moving back again).