I understand some basics about aerodynamics (Turn engine on, put plane on run way, go fast, plane flies because air likes to play with planes).

No really, I was wondering if anyone could explain to me WHY my UCD3D responds and tracks so much differently now that I have squared off the wing tips. I didn't just hack the tips off, I built up an extra wing rib so as not to loose any wing area...Still 65" span.

Any insight would be much appreciated. Thanks.