首先，确定了四旋翼直升机的设计方案。
First, the project of four-rotor helicopter has been decided.
为了进行有关的实验，作者研制了一种基于SG3524和IGBT功率管PWM驱动电路，它是一种用于四旋翼直升机的PWM驱动电路。
Next, to conduct corresponding experiment, a kind of PWM drive circuit based on the SG3524 and the IGBT voltage regulator is developed, and it's a kind of PWM driven circuit for Quadrotor.
Pilobolus剧团以吸收不同寻常的元素出名，不过最为新奇的恐怕要属这两个在乔伊斯舞台上为舞者MattDelRosario伴舞的四螺旋桨直升机（学名“四旋翼飞行器”）。
Pilobolus is known for dances that incorporate unusual elements. Few, though, have been stranger than the two four-rotored helicopters that accompanied Matt Del Rosario on the stage of the Joyce.
四旋翼无人直升机由于其飞行控制相对容易，安全性也得到了较大的改善，越来越受到研究人员的关注。
Because the flight control of four-rotor unmanned helicopter is relatively easy and its security has been improved greatly, it is paid more attention by researchers.
四旋翼无人直升机由于其飞行控制相对容易，安全性也得到了较大的改善，越来越受到研究人员的关注。
Because the flight control of four-rotor unmanned helicopter is relatively easy and its security has been improved greatly, it is paid more attention by researchers.
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