Study on the Influence of the Height Variation of Center of Gravity on Longitudinal Static Stability of AEW

Since the height of the center of gravity of an aircraft generally changes slightly in flight, it does not materially affect the maneuverability and stability characteristics of the aircraft. In the aerodynamic layout design stage, the height attribute of the center of gravity is usually ignored, and it is usually located on the construction horizontal line by default. However, in this paper, an example is given to illustrate that the influence of the height variation of center of gravity on the maneuverability and stability characteristic must be considered in the retrofit design of AEW, Especially at the boundary state of high Angle of attack at takeoff and landing, the longitudinal static stability of the aircraft is greatly reduced. Especially at the boundary state of high Angle of attack during takeoff and landing, the longitudinal static stability is greatly reduced and the pitching moment characteristics may diverge prematurely. This paper theoretically analyzes the reasons for the decrease of longitudinal static stability, and the parameter sensitivity analysis of the height variation of center of gravity on longitudinal static stability is analyzed to guide the retrofit design of AEW.