This is a bottom detail view of my first quadcopter, a Neewer SK450 with a KK2.1.5 mini and XXD motors and ESCs. This is a close-up of the ESC (Electronic Speed Controller) installation; this setup is essentially identical on all four booms. I soldered the wires for testing, then cut them to proper length and re-soldered them once I knew if I would have to reverse any motors — I did, but only one. To reverse a three-phase sensorless motor, simply swap any two of the three wires feeding it.