Rear bumper aero weakness

[aerohead]

Originally Posted by drmiller100

rear bumpers are parachutes in the back of the car. The question is does the parachute
hang low enough to grab air, or is it high enough to be out of the air stream?

trim the bottom 2 or 3 inches off if you are worried.

since 1974,I've never seen a peer-reviewed wind tunnel investigation which reported a drag increase due to the presence of a rear bumper,only data to the contrary.
If you're sitting on some good science about this,it would be a great time to share it.Thanks!