Ok, so I took some video of the helicopter doing a death roll. At least in my case, the stabilizer bar definitely did not hit the bottom rotor blades. I get the chopper caught on some flowers and then pull up and straighten out quickly. I hover for about a half second and then suddenly the servos freak out and I get full left aileron. The chopper crashes into a wall almost immediately. I was looking at the distance between the stabilizer bar and the bottom rotor and there is like 2 inches of space. I don't see how they could hit, even with flexing the bottom rotor (I held the heli by the tips of the bottom rotor just to see) and stabilizer bar.
I think every time I've had a death roll, it has been due to one of the servos freaking out. For some reason, this is induced by abrupt transmitter input.
The video is here: http://youtube.com/watch?v=b9j08or0iRg
. Look about half-way through and you'll see a slow-mo and super-slow-mo of the servo freaking out. The quality isn't good, but you can kind of see what happens. Just keep in mind, after I get up above the flowers, I didn't use ailerons at all. That was all the AI of the helicopter
. More videos to follow...