Actually, if you set the dihedral the way the manual says to, you will get adverse roll coupling in knife edge, which says it needs more dihedral. I've built two of these now (don't ask), and on the first one I followed the manual and it had the adverse roll. On the second, I just joined the wings as they are made, butting the two halves together, taking whatever dihedral it gave me (more). No adverse roll couple on this one.