unable to have a stable tail on spirit 2

[urgno]

hello
trying to find a good tail gain on trex 600 with spirit 2
but even at 100% gyro gain
i get a 90° tail jump ( tail to right ) on any pitch pump

tail servo is savox sb-2272mg

[ZeXx86]

Hello,


you can try to increase Gyro Common Gain. This will multiply normal gain.

[yufasa]

What rudder servo do you have? If it is a fast servo what value do you have for Rudder Delay? Default of 5 is not ideal for fast servos.

[urgno]

rudder servo is savox sb-2272mg
and common gain is already at 1.20
rudder delay is at 0 or 1

[ZeXx86]

It is also very likely your mechanics is not working properly. If you can see such bad behavior then it is almost certain.

Alternatively your servo arm length is wrong. What are values of the end-point limits?

[urgno]

mechanic was hard but that has been fixed

rudder limits are 145 - 155

btw, raising the common gain to 1.40
and configuring gain on tx at around 90-95
finally led me to some oscillation
but only in idle2 at 2300 rpm
and tail is still not so precise

btw thanks to all for the help

[yufasa]

Hmmm, so at 2300 you still have tail blowout or do you have another symptom?

[urgno]

at 2300 little tail blowout at less than 90%
at 95% tail oscillation

[thestructured]

If running the governor, the gain could be too high or too low for response gain.

Your tail thrust bearings could be worn out.

The tail servo could be going bad.

How much collective pitch are you running?

What is piro consistency set to? I would start off around 155 and only turn up main tail gain as much as possible first. If it's already low or default then check the things above.

[ZeXx86]

For this model piro consisteny should be around 170. Not more than 180.
Yes, governor could play a big role too.