# Aircraft Longitudinal and Lateral Transfer Function Terms

The figure shows input and output variables for both longitudinal and lateral stability transfer functions.

I completely understand what each term stands for but I was wondering what would be the best way to physically interpret the relations. I am having trouble visualizing the relationships.

• $$\eta$$ = elevator control
• $$\epsilon$$ = thrust pertubations
• $$\xi$$= alieron control
• $$\zeta$$ = rudder control

• $$u,v,w$$ = translation velocity in $$x,y,z$$ axis respectively.

• $$p,q,r$$ = angular rate in $$x,y,z$$ axis respectively.

• $$\phi,\theta, \psi$$ = roll, pitch and yaw respectively