Thanks to you as well, Ben. I think I am getting the idea about the different airfoils, but what about a bipe? Does this change things, too? The whole reason I started this thread is that I was out at the field today and one member was flying his scratched Smith miniplane bipe. He is an accomplished builder and flyer. it is a large bipe w/ a U.S. 41 for power. It has very good vertical punch and all other flying characteristics are very good. it is an aerobatic ship. I AM NOT SURE WHAT AIRFOIL HE USED (he did cut his own foam cores) BUT THE WINGS APPEAR TO BE FULLY SYMMETRICAL (or darn near). He could NOT get it to outside loop, it kept rolling out of it near the top. Was this a POWER problem, or a BIPE thing, or could it be the airfoil reasons that you discussed in your reply? Thanks again for your help!! ( I LOVE LEARNING MORE ABOUT THIS STUFF!!!!)

Astrohog