About Yaw Control Model of Airplane

Hi all,

I am a new bee and trying to learn the mathematical model of the airplane to calibrate the control parameters correctly. As a first step, I have started with the yaw control due to its easy test without the need of flying. When I investigated the model of the yaw control as seen in the below figure, there are some issues that I can not understand clearly.

latAP.jpg

The unclear things to me are as follows:

1) What is the formula for Turn Coordination Calculation?

2) Inside the circular summation sign after YAW2SRV_SLIP gain should be positive doesn't it? However in the above model it is stated as negative (-). Could you please confirm that whether this sign is correct or not?

3) In this yaw control model, PID parameters (YAW2SRV_SLIP,YAW2SRV_INT,YAW2SRV_DAMP) seems to be applied in series. It seems strange to me. Could you please confirm that this model and the PID parameter applications are correct in this model.

Thanks in advance. 

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