Abstract: According to Kallesøe’s equations of blade motion, new model describes two-degrees aeroelastic equations of asymmetric rigidity and general viscous damping, by means of a finite difference discretization and Greenberg aerodynamic theory. A linearized stationary state space of the system can prove the model valid , by analyzing step response graphs and stability of variable parameters such as wind velocities, rotor Speeds, elastic modulus, pitch angles, air densities and densities of blades.