[Paparazzi-devel] quadrocopter woble when YAW and simultaneously throttle down

[alexeyssh]

Can anybody help! When i rotate by YAW (slowly) and simultaneously throttle 
down or start roll - copter start woble very strog - and some times falls down. 
What params (PID or may be bad battery or proppelers or center of mass) can 
cause this behavior? How i can corrected this? (Sorry for my bad english). 

same as on this video.. 

https://youtu.be/-XTbo3TIVo4