Okay Rich... nice tease... how did you do it?
Sorry, I couldn't help myself.[sm=lol.gif]
It's really easy:
First I cut the top of the core, then I took and cut a straight line across the bottom of the left side to the top of the right side. The airfoil's shape gets elongated, so it's not a true elliptical wing but it sure looks like it. To change the shape of the wing you change the airfoil. This gives you a flat bottom airfoil, but if you put two of them together it's a symmetrical airfoil. I'm not a fan of symmetrical airfoils, I don't fly upside-down halve of the time, with the little stuff I really enjoy floaters.