Quote:
Originally Posted by aerohead
Historically, 'low-drag' diffusers are never at more than 4-degrees upsweep angle.
'(C)hange in a pressure distribution is highly significant for the origin of drag.' Wolf H. Hucho
'With a long diffuser, a notable reduction in drag can be achieved with a very small angle... however, this effect is only assured with a smooth underside..' Wolf H. Hucho.
'L)ow energy flow cannot withstand a pressure increase and therefore separates from the contour.' Wolf H. Hucho.
'Steep tapering...is limited as the resulting flow separation increases air drag.' Wolf H. Hucho.
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Well I was just going off Julian Edgar saying 10 percent in his videos. I’ve seen a few cars with much steeper rear diffusers like the polestar 2 EV. Obviously the mock up diffuser I made is less than 10 percent. Pretty much was just trying to continue and elongate the existing panel and angle by another foot