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Vajious Minimum-Time Turning Maneuvers for two high angle-of-attack, sixdegree-of-freedom, aircraft models have been investigated. The primary aircraft model is for a nonlinear 6-DOF F-16 fighter aircraft with high angle-of-attack ma­ neuverability. The other model is for a linearized 6-DOF F-18 fighter which also caji be flown in the high angle-of-attack range. Standard 6-DOF equations are employed except that the Quaternion attitude representation system is used instead of Euler Angles to avoid the pitch angle singularity of Euler Angles. These Optimal Control problemsh&ve been transformed into Nonlinear Program­ ming problems via Parameter Optimization techniques. Different parameterization techniques were tested on the Van der Pol Problem and Soliman's Problem and their variations before applying them on the main turning problems. These techniques include Control Parameterization and State Parameterization {Inverse Dynamics Approach). Also, a novel Control-Integration Method is proposed to find the dis­ continuous control history of the possible Singular Arc Problems. Different ways to deal with various types of constraints are also discussed. In particular, when dealing with path constraints of the original optimal control problems, an Extreme-Boundson-Intervals method was created. However, it has not been actually developed and tested. The resulting sparse Hessian matrix from this method can speed up the

Optimal turning maneuvers for six-degree-of-freedom high angle-of-attack aircraft models