Well this vision 6S battery pack has caused a crash before. And this time it does it again even though we repaired it well last time. Its just that during flight one of the soldering between cells will break off leaving no power to motor and Heli will simply crash. No idea why the Auto rotation is not working. RPM on main rotor head go down just suddenly. Maybe I need re check the belt tension and Auto Rotation gear settings. Anyways this time we were lucky Heli fell in Thick bushes near water and did not have any serious damage. We replaced the Main shaft and its flying awesome again. I might need to replace the T housing just to be safe. Comments and feedback welcome at [email protected] , [email protected] or [email protected] Don't forget to visit , and Subscribe to