Quote:
Originally Posted by trebuchet03
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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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  |
That was the most effective shape possible on a $20 budget...Yes I could of done a lot more and could of had something better but that would require a lot of money. You got to draw the line of how much spending to get better FE you're going to do...My design was simple and effective...I wanted to do the whole underbody of the car and finish off with a crazy diffuser but that would of wasted a lot of money..