拉力(P)是总空气动力的一个分力。拉力的大小不仅取决于总空气动力的大小,而且还取决于总空气动力的方向。就一具制造好的螺旋桨来说,桨叶仰角合速度的大小和方向都会影响拉力的大小。飞行中发动机的油门位置、转速、飞机的飞行速度和高度的变化,都会引起桨叶仰角、合速度的大小和方向发生 Tension (P) is a component of total aerodynamics. The size of the pull depends not only on the total aerodynamic size but also on the overall aerodynamic direction. In the case of a well-made propeller, the magnitude and direction of the combined speed of the blades at their angles of elevation will affect the magnitude of the pull. Flight engine throttle position, speed, the aircraft’s flight speed and altitude changes, will cause the blade pitch angle, the size and direction of the speed of convergence