Trex 500 and Spirit GT Tail Oscillations.

[helicopterjeff]

Just after take off, the tail starts violently oscillating.

My normal solution before the GT was to turn the gyro gain down.

I've read the guides on tuning, but I'm not sure how to turn the tail gyro sensitivity down in the software.

The rudder common gain is 1x and doesn't go lower. Stabilization is set to normal and it is set for flybar.

The tail servo horn is at 90 degrees and the tail link is the same. (this is how it was setup prior to installing the GT and didn't have issues using a standard heading hold gyro)

I double checked the travel for the tail servo as well, its just to max on left and right.

Any suggestions?

Thanks!

[ZeXx86]

Hello,

you have to adjust Gyro Gain in your radio by default.
At the Diagnostic tab in the software you will see current Gain.
I recommend to start with 50%.

[TrueBuild]

I found this a very useful video for some gyro systems; https://youtu.be/o2ee2VDAENg
He is compensating for the torque of the rotor blades and thus giving the gyro less work to do it seems.

[andy6409]

I had this problem with a 500X
It was caused by the align esc governor if you are using that

[helicopterjeff]

I will take a look at the radio end, i have a question about that though- isn't the yaw channel also used to set the stabilization mode? (turn it on/off)

[helicopterjeff]

I found this a very useful video for some gyro systems; https://youtu.be/o2ee2VDAENg
He is compensating for the torque of the rotor blades and thus giving the gyro less work to do it seems.

I have used that video in the past. It helped a lot with a different model.

[helicopterjeff]

i finally got it. learning the GT controller has been an adventure.

I realized the rate channel was set very wrong....now ive got it so ive got three sensitivities based on what im doing.

Thanks for all the help!