The frame assembly is diveded in two parts because before mounting everything, we have to do some calibrations in the Autopilot. So in this first part, only the arms, motors, ESCs, upper body and the power distribution board are mounted.
Here you have some pictures about this process:
Before starting the next activity, it is important to pay attention to the rotation of the motors. Each motor has 1 rotation direction. It can be seen in the little arrows that each motor has in its body. So, before starting the next assembly, be sure of the position of each motor and its rotation. To know the rotation of the motors, have a look in the next figure:
