Quote:
Originally Posted by Old Tele man
ANALOGY - imagine this airplane WING airfoil as a car (lefthand pix):
...or, think about this being UPSIDE down, and think what the inverse of LIFT-INDUCED drag would be (DOWN-FORCE drag!):
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Your analogy is false because the GT-R uses it's floor/diffuser to create most of it's downforce which is basically 'drag free', and why underbody downforce is always so heavily policed in racing.
A diffuser's typical lift to drag is 10:1 and can even reduce drag while still generating modest downforce
Compared to a rear wing's typical 3:1. Front wings on open wheel cars can be as low as 10:1, but that's because they're basically front mounted diffusers.