Tim,

Way cool ... I picked the S8052 because it's a good, standard Quickie racing airfoil that also performs well inverted & has no bad habits. But certainly any 12% to 15% symmetrical would work fine, or for straightaway speed you could try a laminar airfoil such as the NACA 66-012 (which also happens to be symmetrical).

If you do use a laminar, I would suggest increasing the washout a bit -- from the 1 degree shown on the plans to maybe 1.5 degrees or 2 degrees. I mention that because somebody posted a comment recently about having to actually add washout to a Quickie (constant chord, normally shouldn't need washout) to avoid tip-stalling with a laminar airfoil.

Duane