Gottem' off the internet... drag coefficient and downforce based on wing type, size, angle and velocity.

This is a dual wing set-up with the principal airfoil being a NACA S1221 that measures 56"w X 8"d and a Gurney flap that is a NACA S1220 12% airfoil measuring 56"w X 2.5"d. Both are independently adjustable.

Toughest part was determining a velocity for the calculation. To do this, I went back to all my track times from last season which lists average speed per lap as well as time. I averaged the speed (velocity) on each track independently, then made the calculation at incremental angles of the wing at the averaged speed.

Looks like most tracks will require an 11.5 degree angle for optimal performance (downforce vs drag) Producing an averaged downforce of 212 lbs. While the faster tracks (CAL SPEEDWAY, etc) will require somewhere in the 10 degree range.

Looks like I'm going to have to invest in an INCLINOMETER... My standard Craftsman bubble balance aint gunna do the trick !!!