Also blowing the rear brake ducts is an avenue worth exploring. The exhaust geometry doesn’t work quite so well in this area. Brake duct vanes, which we have seen proliferate over the past few years are allowed to be 120mm inboard of the rear wheel, roughly in line with the wheel and can protrude forwards the front perimeter of the tyre. But as some of the brake duct is ahead of the rear axle line there is less surface to blow on.
This might still be better than rear wing blowing, as the downforce is produced directly on the unsprung wheel, rather than passing through the suspension. The benefits of this over rear wing blowing would need a simulation to establish the better path.
Practicalities of heat shielding the rear brake ducts are already understood from EBDs which already apply of the exhaust plume over their surfaces. Also tricky would the positioning of the brake cooling snorkel, but again this is not insurmountable.
http://scarbsf1.wordpress.com/2011/1...blown-effects/