APM Arming Question

ArduCopter Copter 3.1
1

Hi Everyone

I’ve build and fly a Octo copter recently and have a question: when arming the APM Bord one of the 8 motors starts to run… is this normal? When opening the throttle the others starts to run and one can proceed to a normal flight without difficulty.

I’ll will appreciate any information.
Regards
Optical

2

[mf]General/Multirotors[/mf]
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