One motor gets extremely hot

I have an issue with one of my motors thats getting extremely hot. I changed my ESC's and battery yesterday to 4S. Before I used ESC's and 3S battery on the same rig, without issues. Its a quad, X configured, but now the back rightside motor get so h

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Alt hold PID - Tried everything I can think of

Hi,

Im relatively new to APM. I have the APM2.5 with latest Arducopter firmware loaded. I've tuned out my Stabilise flight and its sweet, but I cant seem to tune in AltHold. As I understand it, it doesn't help going on the loiter or anything else, unl

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