In the first chapter the required mathematical tools are developed. In the second chapter, a method to find complete movement equations for a deformable vehicle is presented. In the third chapter, reference states for flight are defined and a complete kinematical solution is proved. Also, a method to dynamically compensate or trimm a vehicle on these reference states is proposed. On the fourth chapter, the movement equations for the perturbed state are thorougfully developed and some expressions for stability derivatives are presented.