I have wanted to add skirts to a car for awhile I finally got to start on them.
This is my first attempt to check clearance and get an idea of how I want to set them up. I only created the one and copied the shape so I can cut a second one. With only the one currently installed I did see some improvement on a downhill glide from 81mph normally at the first overpass I would be at ~72 and would have to be in gear before the next overpass now I'm at ~74.5 at the first and 70 at the end of the second overpass.
It is not the best way to test and will be more dramatic with them on both sides.
A few changes that I can make is in the back it can go about 1-1.5in lower and the front can go 3-4in lower without getting in the way. What I'm not sure of is how I should transition the lower front to the back. Should I make it a straight line (see red line in pic) or curve it some like a flat S (green line)?
I'm still thinking of how I will attach it I have a few ideas but it will depend if I decide to do an external (as depicted) or flush mount.