1.A theory of aeroelastic stability of hingeless rotor blade in hover by using the Galerkin weighted residual finite element method is developed in this paper.
15.The clatter of the engine stopped with a final cough, the tail rotor spun briefly in neutral, and the main rotor blades completed a few awkward revolutions and then drooped to a halt.
16.The hand came out and flashed A, and the man on the ground winked back the B and the C. Then the rotor blades flattened and softly the great iron insect sank to the ground.
17.As the man stood and stared up the path of the moon, he could just see a clumsy black shape coming fast towards him out of the east and for a moment the moonlight glinted on whirling rotor blades.