_5 &=& \alpha_{\rm T} 	\\
%     \nonumber {\rm x}_6 &=& \dot{\psi}
%     \end{eqnarray}
% </p>
% <p>and the state equations are</p>
% <p>
%     \begin{eqnarray}
%     \nonumber \dot{{\rm x}}_1 &=& v_{\rm T} \cos \left( \psi + \alpha_{\rm T} \right) \\
%     \nonumber \dot{{\rm x}}_2 &=& v_{\rm T} \sin \left( \psi + \alpha_{\rm T} \right) \\
%     \nonumber \dot{{\rm x}}_3 &=& \dot{\psi} \\
%     \nonumber \dot{{\rm x}}_4 &=& \frac{F_{x,{\rm F}} \cos \left( \alpha_{\rm T} - \delta_{\rm F} \right) + F_{x,{\rm