take a bubble level and lay it on top of the wing...

similar to the pic you have posted..

and level the front and back oif the wing

use this as your baseline

your pic shows the idea of zero deg... but it is not at zero

 

OK. That's what I thought. I used your pic, but couldn't rotate it level

Do you have any tips on range of degrees I might use? 0-?

Thanks for all the help Tim.

Jim

 

11 degrees is considered alot of wing, this will produce max downforcve and max drag. 0 incidence will still produce downforce, but with less drag.

Set the wing flat for high speed tracks, and use more wing angle for slower "handling" type tracks.

you will need alot of trial and error to find the optimum angle

 

Hmmm...

It certainly did not seem right that the bend in the wing would not follow the line of the rear bumper, but it also did not seem right that the mount flanges would be raked so drastically. Of course, I understand the concept of an aerofoil wing element, but it was not easy to see the extent of that in the previous pics. Now, with the end plate off, it is much easier to see. And here I even post a pic of a car I built! Not enough time around GT cars lately! Dormant brain cells

So, the rake of the mount flanges suggests that they intend the rear bolt hole to be the pivot, and the front allows enough material overlap to house the series of holes for angle adjustment.

Incidentally, now that I recall... when I built the GT car I pictured, I not only made a row of holes in the top/front of the alloy extensions, but also in the bottom/front. I could change the angle of the element both by moving the element itself, or the assembly. I set it up to have holes that corresponded mostly to the forward side of 0 degrees (more downforce/drag), but a few to the rearward side (less downforce/far less drag) as well.