The paper presents a method for calculating the effect of aerodynamic interference between the wing and horizontal tail on the aerodynamic characteristics of the Su-30MK2 aircraft, based on a theoretical model of the wing-horizontal tail configuration. The study separately determines the lift coefficient and the derivative of the lift coefficient with respect to angle of attack for the wing and horizontal tail; these quantities are then corrected using interference coefficients and the effect of the flow field downstream of the wing. The comparative plots at M = 0.1, 0.5, 1, 1.5, and 2 show that the interference effect is most pronounced in the negative angle-of-attack range from approximately -10° to -5° and continues to affect the lift coefficient at positive angles of attack. This provides a basis for improving the accuracy of aerodynamic-characteristic calculations, longitudinal trim, and studies of the stability and control of the Su-30MK2 aircraft.

Huu Dung Nguyen, Trong Thuong Tran, Dinh Dat Le,"Research on the Effect of Aerodynamic Interference between the Wing-Horizontal Tail Configuration on the Aerodynamic Characteristics of the SU-30MK2 Aircraft" International Journal of Advanced Multidisciplinary Research and Educational Development, V2(5): Page(532-534) September - October 2026. ISSN: 3107-6513. www.ijamred.com. Published by Scientific and Academic Research Publishing.