The main wing is not symetrical.. it is actually a copy of the old Carl Goldberg semi-symetrical airfoil that was used on the Senior Falcon and on the Falcon 56... I'll look at the Selig 8020 but would guess that its pretty close.. If I had to describe it, at about the 20%-25% point, the bottom starts to flatten while the top continues to curve upwards.(look closely starting at the4th rib out and you'll see how its pretty flat) At 50% the top starts dropping towards the trailing edge, while the bottom has a straight line back. Of course these are approximations.

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