飞机依靠副翼、升降舵和方向舵等各种气动舵面在空中作六个自由度的运动。然而,这种气动舵面在低速时效率很低,在零速度时则丧失作用,在高速,例如在超音速飞行时其阻力很大。此外在气流中工作时必须严格控制在一定的迎角范围内,否则极易失速,使飞机进入螺旋而失控。据报道在1965年到1986年期间,西方世界的飞机因失速进入螺旋的坠机事故有566起,其中85％为机毁人亡的一等事故。为避免上述问题,可借助喷气发动机的推力,改变喷气流的方向,利用它 Aircraft rely on the aileron, elevator and rudder and other pneumatic rudder in the air for six degrees of freedom of movement. However, such aerodynamic surfaces are inefficient at low speeds, ineffective at zero speeds, and very resistant at high speeds, such as supersonic flight. In addition, the work in the air must be strictly controlled within a certain angle of attack, or easily stalled, the aircraft into the spiral out of control. Between 1965 and 1986, 566 aircraft crashing into the spiral was reported as a result of a stalled flight in the West, with 85% of them being the first to have died in a plane crash. In order to avoid the above problems, the thrust of the jet engine can be used to change the direction of the jet stream and utilize it