Sorry to bring this up from the dead, but I'm in a position to have a custom wing designed just for us Z guys.
From what I've gathered so far, that is probably a good height, due the the vortex generators moving the clean air further downward. And if I recall correctly, wasn't the wing most balanced at providing downforce and less drag when it was completely flat right?
What about the actual shape of the wing? For simplicity's sake, I'm planning on using a rectangular sheet of aluminum, but I can design almost any bend on it, as in I can make a flat blade like this / or have it curve at the end ).
Another thing that has me worried is the hatch's strength. Do they deform when the downforce is supplied? I'm thinking of adding some flat stock inside the hatch where the wing bolts up to distribute the force.
Oh yea, the angle of attack will be adjustable with rod ends and such.
Thanks,
Mario