Right click control the knuckle (telescope) Angle, left click control the slewing and topping Angle.
用鼠标点击控制关节(望远镜)的角度，左键控制回转和一流的角度。
2
The technique was applied to a simulated model of a boom crane slewing at a constant luff Angle while reeling in the cable and linearized around the payload equilibrium position.