Question for somebody who has removed the lower wing and added it to extend the upper wing. I have attempted this several times with each having the same result. The plane lifts well until I turn, even slightly. The plane will go into a downward spiral. The only way to counteract the spiral is to turn the other way then the plane begins to spiral in that direction. Somebody mentioned that the dihydral of the wings wasnt sufficient. Has anybody else encountered this spiral after modifying their AA and, if so, how was it corrected? I've tried fishing line attached to each wingtip to give it more dihydral - no luck. Any suggestions? Maybe I'm not attaching the extended wings correctly. I simply tape them to the existing upper wing with thin packaging tape, making sure that the leading edge and the ends are as flush as possible. The extended wings always seem to bend slightly downward no matter what I try. I was thinking about underneath support for the extensions but was concerned about adding too much weight. I tried to make my wings look similar to those shown in Big Milo's movie as he seems to have been successful in this mod.