Technical stability of nonlinear states of an elastic vehicle in vertical flight

Sufficient conditions of technical stability of nonlinear dynamic states of extended elastic flying systems in controlled longitudinal vertical flight are obtained. In these flying systems, the effect of variation of their cross-sectional area, transverse strains, and oscillations is taken into account. The formulated criteria of technical stability depend on the basic parameters of the process controlled, namely, on the increment of the transverse load due to the curvature of the axis of the system and aerodynamic forces during vertical flight.