rc helicopter help!!

[javed hussain]

Hi,
I crashed my 450 heli. But i don't know why my heli is crash. My heli started rotating automatically in one direction and goes out of control. I fly heli just minute before then it was flying nice but in second time it create problem. I checked my gyro and it in 75%. And the gyro is working good but i don't know what is problem. Please help me so i can understand problem of my heli.
Did it cause by grass which is touching on tail blade.
This is link of my video() please see and help me.
Thanks.

[Ajay JM]

Since you say that gyro is good and calibrated, make sure the belt tension is correct if the tail is belt driven and not torque tube. If torque tube instead, verify the tail gear is not stripped.

[newpg202]

The gyro may not not set correctly or there is another possibility of the rudder servo binding, which may cause this type of problem. Check if the tail rotor pitch slider is perfectly smooth.

Sent from my Mi A1 using Tapatalk