How to get the tail under control?

ArduCopter Traditional Helicopter
1

Dear all, could someone with more experience in setting up a heli’s tail share some thoughts, please?
Here is a log where autotune failed:
2025-08-18 Autotune Yaw failed.bin

It’s an old Blade 450x, by the way. The tail has always been oscillating. Not sure if my vibration isolation is up to the task. Notch filter seems okay to me.

Many thanks!
Sven

2

set these values to minimum, and start from there
ATC_ANG_YAW_P ( which would be 3 )
ATC_RAT_YAW_P ( which would be 0.1 )

once these values are set to minimum, try to fly them, and gradually increase these values.
since they are the minimum, you can only increase them.

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