如果飞机飞的太快的话，升力的重心就会从机翼转移到前半部机身上，飞机就会下降，速度会接近音速。

If you go much faster, the center of lift moves back on the wing, pushing the nose down and increasing velocity, until you soon approach the speed of sound.

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CX1型无人机机身细长，动力装置距离飞机重心较远，对飞行性能影响很大。

The fuselage of CX1 UAV (Unmanned Air Vehicle) is slight and motive equipment is relatively far from the plane center, which influence the flying performance greatly.

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