Just going to chime in here to the original post with this....
That's a Noble M12 GTO
We measured the diffuser angle to be a tiny tiny bit less than 10 degrees with a digital angle finder (horizontal was set as the shop floor and measured with the car on the ground).
Note the little winglets pointing down to keep air from the tires/side from interfering with the faster flow through the diffuser....
For last year's HPV (The one in foreground), diffuser angle = 10 degrees with something like an 8 degree inlet in the front. These planes don't intersect - there's a flat region from the wheel well area to a little bit behind the wheels.
Those angles were not arbitrarily chosen
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Originally Posted by compaq
I used common sense..make sure the air flows and doesn't get stuck anywhere...
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Originally Posted by RH77
Right, but I think what Fabrio means is that it abruptly curves upward, which can create turbulence. "Straw A" does not equate to your design:
Straw "C":
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Originally Posted by Compaq
It does abrupty turn upward but it's curved such a way that air exits after the bumper and not inside the bumper...
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RH77, I think Compaq is fixing a problem of a parachute type effect as opposed to what Fabrio is looking for (something to do stop "parachuting" and work as an effective diffuser). But, Compaq, as a diffuser - that shape is not optimal. The curvature eventually reaches an angle that is way too steep for flow to stay attached without separating "cleanly." Optimal? No. Effective? Possibly. There's no room for all or nothing
