Quote:
Originally Posted by skyking
you'd do a high angle for downforce?
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Yes. You're looking for separation under the diffuser. The low base pressure of the wake can telegraph this low pressure under the rear overhang,creating a moment (torque),which attempts to rotate the car about the rear axle,creating some of the downforce.
Induced,counter-rotating,longitudinal-vortices on each side of the diffuser creates a low-pressure,upwash from the belly,which acting at a vector,adds additional downforce. The resultant force from both sources helps keep the rear planted at speed.
The 2019 Nissan-Renault Alliance ALPINE A 110 gets away from using a spoiler with this trick,plus the 'template' roofline,as per Hucho, 2nd-Edition,page 281. A 155-mph car.