quote:

ORIGINAL: kahloq

Not so sure on the reveresed aileron thing KC. I admit I had that happen on my H9 Hellcat. On mine, it took off fine and I also had to level it out with elevator cuz it took off at a rather steep angle. After it was leveled off...it started banking to the left and I tried to correct with right aileron. ONLY thing it did was continue banking left, just at a much faster rate since I was unducing it more so due to the reversed ailerons. Thats not what happened in your case.
I dont see how its possible at all for it to be reversed ailerons on your plane and have it snap BACK to the right during a left roll over and spin in that way when the intial bank was left and it didnt continue left unless you did push the stick left during the spin. Im sorry, but its highly unlikely it was reversed aileron....still possible though. Many ppl, even experienced pilots, are quick to judge something like this as reversed ailerons cuz it kinda looks like it at initial glance, but when watching the video a few times, i highly doubt thats what the problem was. Everyone means well in this thread and they are all just trying to help of course.

I would have to agree that the CG may have been tail heavy. In this case, the plane can do a lot of funky things when loss of pilot control happens. Your plane really looked like it was struggling to stay on a balanced attitude. My guess is the manual CG wasnt so good. Also, even if it were just on the cuff of being tail heavy, too much aileron input WILL induce a spin and snap. Also, on a tail heavy plane, the elevator is super sensitive and just the elevator alone can induce a snap roll, stall, etc.

Now, the last thing it could be was a voltage problem on the battery to the RX. If the rx sees a voltage loss and it goes under 4volts, the plane can go into lock out and cause something like this as the servos will no longer respond. But I doubt this is the case.

Edit note:
I did go back and watch the youtube videos G-pete linked to and yes those were reveresed silerons and the planes in question did reverese the roll during the loss of control, but it was not quick like jerking over.....on those videos it appears the pilot tried opposite aileron to correct as the timing was such that it was about right for an aileron servo travel going from one deflection to the other. On KC's plane, the sudden reversal to the right was instant thus indicating a CG problem in my opinion.