Ardupilot (APM) 2.5 - Setting up and testing your motor connections

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ArduPilot (APM) 2.5 Motor configuration
I finished building this model yesterday after flashing the ESCs with the latest Simonk firmware. It then took over 3 hours to figure out what I had done wrong -- the model inputs seemed to be 90 degrees out of phase with the controls.
I suspected that I had reversed two of the motors but which two? The wires run inside the model and I had carefully (I thought) marked up the ESC connections to the APM board with numbers to clearly show how they were connected.
Eventually, I unplugged one of the motors at a time and riased the throttle slightly - I spotted that motor '4' stopped spinning when I unplugged the 'number 3' connection and vice versa.
Now flying well and I'm learning all about the APM 2.5 (V2.9.1) firmware.
Sorry about the quality of the audio the size of the new quad means that I have to fim outside if I want to spin the props!
Thanks for watching and post any comments of questions.
Happy Flying!
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