Looks like the batteries were undersized to me. With all the gear on that plane one pull-down in voltage would send the plane into "failsafe mode" and lockout the controls. Sounds like the tubine went to idle and all the other controls to the default settings.

If you get 3-4 amps on one of those batteries you could see this type of drop in voltage. That could occur if all the servos operate at the same time. This can happen a lot when people use the higher torque servos used for mechanical retracts like the JR-791 servo.


Jeff