How do you analyze nonlinear flight dynamics for post-stall maneuvering?

Post-stall nonlinear analysis requires: Full 6-DOF simulation with nonlinear aerodynamic database extending to high AOA (60+ degrees), Unsteady aerodynamics capturing hysteresis and rate effects, Rotary balance data for damping in autorotation, Forced oscillation data for dynamic derivatives, and Real-time calculation of vortex breakdown effects. Methods include: Bifurcation analysis identifying stable/unstable regions and transitions, Multiple equilibrium point tracking, Monte Carlo simulation for departure susceptibility, and Time-history simulation with pilot models. Applications include high-AOA envelope clearance, spin mode identification, and departure warning system development. Validation requires extensive flight test correlation. Tools include specialized codes like CASTLE, ADAM, or custom nonlinear simulators.