The Stability of Longitudinal Motion of Amphibious Aircraft During Takeoff

In this paper, the mathematical model of the takeoff of an amphibious aircraft was established. On this basis, the hydrodynamic coefficients in the pitch and heave motion equation were calculated using the strip theory. The stability criterion was used to analyze the longitudinal motion stability of the amphibious aircraft during takeoff, and three characteristic parameters of the general stability of longitudinal motion were obtained: natural period, half-decay period, and damping ratio. The result showed that the motion of amphibious aircraft was stable during takeoff.