Sorry if this might not be the proper board for this question, but I'm at my wits end (which isn't very far), so I thought I'd turn to you guys for some advice. here's the deal:

I'm flying a Dragon Lady 40 which I just finished about two months ago. It has dual aileron servos mounted in the wing. After the first couple of shake-out flights, the plane flew great. The trims never needed adjustment and it track straight and true.

Then, one day, it wants to roll right in a bad way. I moved the trims left (almost all the way) and it seemed to correct OK, but after a couple more laps, it rolling left like crazy. After trying to chase the trims back and forth and almost crashing in the process, I got it down in one piece.

I had a much more experienced builder and flyer take a look. He thought it might be some slop in the aileron linkage due to my poor z-bends. So, back to the shop. Got all that taken care of with clevices on both ends and made sure the hinges were all good. Double-checked the rudder linkage and hinges too.

Back to the field and it's still doing the exact same thing.

The only other thing I can see that's different, is that my battery was a bit loose and was able to shift a half inch or so. I have resecured that but haven't had a chance to test that.

So, my question (finally) is: is that much movement in the battery likely to cause such results? And if not, does anyone have any other ideas?

Thanks in advance for your help.

Neal