Wing Angle

As Darren pointed out it is very difficult to just come up with a set angle. The aerodynamics of your car has a lot to do with what is going on. The air coming over and on the sides of a body can hit the wing from the underneath and actually cause lift on a negative wing. I watched a Corvette Promod actually lift the rear wheels off the ground because the wing was too far forward on the car. We put a wing on the rear of our 98 TBird and found that zero lift was actually around a negative 6* on the wing and we had a real wing. I would highly recommend mounting that rear wing as far back and as high as you can get it to be in the smooth air.

Do you have rear shocks on the altered? That would really help in measuring the downforce. Let me know if you have shocks and I will tell you how to measure the downforce.

The other thing you have to be real careful of is not putting so much angle on the wing that it actually stalls and becomes a boat anchor. If it is a real Bernoulli wing then it will stall just like and real aircraft wing if too much angle. I have seen some cars with 25-30* down angle on their wings. That has to stall the wing and really slow them down.

If no shocks then I would start off with too much negative angle just for safety. Darren's angles maybe a good stat off point.

 

dual element

Unless you are running a nitro motor, the dual element wing will be way more than you ever need on a blown alcohol motor. Make sure you have a couple of degrees of front wing with that much rear wing.

If it's blown alcohol, I think you would pick up quite a bit with a single element wing. You may be able to get away with just taking the second element off your wing.