Quantitative evaluation on characteristic index of post-stall maneuvers fighter

The post-stall maneuver can effectively improve the fighter's ability of air-combat and survival. The dynamic equations of high angle of attack with thrust vector using quaternion method were built. According to the purpose of post-stall maneuver-changing nose pointing, and combining maneuverability and agility, the changing law of primary parameter of post-stall maneuver process was analyzed. Four indexes evaluating the post-stall maneuver quality were proposed, including maximal trim angle of attack, the time taken to change from level flying to maneuver angle of attack and the time taken to change from maneuver angle of attack to initial level flying, the time taken to roll around velocity vector and reach 90° angle of bank at maneuver angle of attack, and the period of post-stall air-combat. The simulation and quantitative evaluation research was carried out, and the results show that these indexes brought forward can lead to convincible evaluation of post-stall maneuver.