I'm a having to place extremely coupled, nonlinear dynamics into state space form. I'm working on a quad turbine UAV. I myself have no experience with state-space or any form of control engineering for that matter. Do anyone know of good online reference material i could possible use? Also.... And if someone out there knows anything about state-space... is it possible to have your inputs inside your input matrix... For instance. I have 6 coupled equations... each having some terms resembling the term described below: (A^2+B^2)sin(alpha)*constants.... the problem i have is that I'm having to make (A+B) and apha a input (using the control algorithm i'm expected to use).... Now I cant work out how to place these terms into the input matrix form.... any suggestions would be amazing?