As the rotative velocity of propeller adds, the lift adds and the drag goes down.So the lift-to-drag ratio is enhanced greatl y, also, the longitudinal stability of the plane is decreased a little.

• 螺旋桨转速增加，使飞机升力增加，阻力减小，从而使升阻比有较大增加，同时使飞机纵向稳定性稍有降低。