回转飞行器是一种力学智能玩具,它是由完全相同的四个叶片和圆底座构成,每片叶片都做成机翼状,并把叶片粘贴在圆盘上,如图1(a)所示。当我们拿着它在竖直平面以较小的仰角向前上方掷出以后,飞行器既自转又公转,绕行一圈后飞回起初的抛掷点,如图1(b)。飞行器为什么会飞回来呢?现从力学理论上来分析,最后介绍一下制作方法。 The revolving aircraft is a kind of mechanical intelligent toy. It is composed of four identical blades and a circular base. Each blade is made into a wing shape, and the blade is attached to the disk, as shown in Fig. 1(a). When we took it in the vertical plane and tossed it forward with a small elevation angle, the aircraft rotated and revolved. After flying around the aircraft, it flew back to the initial casting point, as shown in Figure 1(b). Why does the aircraft fly back? Now it analyzes the theory of mechanics, and finally explains how to make it.