I recently built a 140% version of the mini Corsair. So far, it flies great. There is one thing I was curious about though. I didn't scale up the airfoil profile. While the spar is wider than it was, I still only used one layer. So while the cord and the span are scaled up the thickness is not. Would it be better to scale it up as well? If the airfoil is thicker, it would create more lift but more drag, right? More lift lowers the stall speed, but more drag lowers it, right? How do you achieve optimum airfoil thickness?