I don’t recommend using QAutotune for the tailsitter, it produces bad results (tested countless times, even on the sim), at least with my tailsitter.
You can use it for Roll, where the correction is actually given by the change in rpm of the motors, but Pitch and Yaw work with servos, that’s why QAutotune struggles to work well.
Instead, I suggest you tune with the transmitter based tuning method.
To give you an example in my tailsitter with QAUtotune the parameter Q_A_ANG_PIT_P sets it to about 3, where instead the optimal found manually is 24.
If you want an excellent stability on the attitude you have to act manually.
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