mkg3
Well-Known Member
It's to reduce the base drag from the square back. I wished the R1S had this but since it does not, I have put vortex generators on the roof top up stream a bit to reduce the base drag. The drag is caused by adverse pressure gradient due to flow separation behind the vehicle.I would also be interested in how much these tailgate scoops help drag and efficiency.
![]()
If coupled with a controlled diffuser, it can significantly lower the overall drag of the vehicle. What people often see in on the race cars are to increase the downforce. The diffuser to lower drag would not be as big and mostly to control the flow direction rather than lower the underbody pressure. Rivian has filed for a patten on deployable diffuser that gets deployed at the freeway speeds - sort of like how Porsche has a rear wind that deploys at speed, except this is for below the bumper.
Sponsored