Quadcopter tuning.. Need help

Hi All,

 

I'm slowly working out the fine art of quadcopter building and flying but i have a few problems.

 

It doesnt seem very stable, I can takeoff, get it to a certain height, eg. 5m, switch it to alt hold mode, with throttle set at hovering and it just drifts up, it might go up 10-15m, then the motors die down, it comes back down to 5m or so, then drifts back up again.

 

I have the recommended sonar installed, not sure why its doing this.

 

Also a few other problems ive seen on the forums, it seems to gain a lot of altitude when flying forwards or backwards at a decent pace, maybe 7-10m gained during short flight forwards. Thats in Alt Hold mode.

 

And also it doesnt hover very well, tends to want to drift back to the right, have to manually try and hold it in place.

 

I am leveling the copter as best I can, but i dont think its probably good enough. Could that be causing much of a problem?

 

Quadcopter is using an x525 frame, turnigy 2217 860kv motors, apc 10x4.7 props/pusher combo.

Stock PID values

 

Any suggestions would be greatly appreciated.

 

Thanks

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