Study of The Flying and Handling Qualities of a Glider-Type Aircraft for Instruction Purposes

The goal of this paper is to conduct a study on the flying and usability attributes of a glider-type aircraft used for instruction. For the development of this project, we propose a dynamic model where we introduce small disturbances to calculate the longitudinal trim state in subsonic flight conditions. Using longitudinal trim data, we showed the linearized equations of motion to find the dimensionless and dimensional numerical values for aerodynamic stability and control derivatives along the longitudinal and lateral-directional axes. After that, we found the characteristic transfer functions using disturbances and accelerations for the sake of the best glide ratio speed, in order to calculate the aircraft responses in aerodynamic controls. Finally, we got the static and dynamic stability responses; and so, we analyzed the flying and usability attributes according to the standardized requirements. The results obtained are shown using aerodynamics coefficients, MatLab® graphs (step, impulse, ramp, Bode diagram and Root place), the stability modes, the rudder lift curve slope, the control fixed neutral point and the maximum permissible stability margin. In this way, we showed the calculation of stability, influencing factors and its effects on the flying and usability attributes of a glider-type aircraft.