The ability to conduct re-supply missions and to transport goods is quickly becoming a requirement in the VTOL UAV market.

任务再补给能力和货物运输正迅速成为垂直起降无人机市场的一个需求。

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In the paper, according to the dynamics and kinematics principle of the four-rotor VTOL aircraft, non-linear and linear models were established.

文中根据四旋翼垂直起降机的动力学和运动学原理对其建立非线性模型和线性模型。

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Based on the principle of flight of fan wing aircraft, realizing methods of VTOL are preposed by changing the Angle of attack and increasing chord length of the tail.

基于扇翼机的飞行原理，提出通过改变攻角以及增加尾部升力面弦长的方式提高气动效率，进而实现垂直升降的方法。

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Based on the principle of flight of fan wing aircraft, realizing methods of VTOL are preposed by changing the Angle of attack and increasing chord length of the tail.

基于扇翼机的飞行原理，提出通过改变攻角以及增加尾部升力面弦长的方式提高气动效率，进而实现垂直升降的方法。

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