All speeds. The last time it happend, I had just come out of a loop and powered up. Boom 90 degree roll to the right. Also does the roll quite often when landing. I have become aware and am ready, I can give it left and get it back. The plane will not last long however, if I don't figure out what is causing the problem though. I did soder in my own aileron extensions this morning. I have the ailerons seperated on channels 2 and 6 on a JR 8103. The xmitter is fine, have flown other planes with it and now problems.