Hope I'm putting this in the right forum to start off with.
I'm having a problem with the speed of a motor on a quad using a Pixhawk. It's motor 3, it's slower than the rest. Noticeable particularly at low RPMs. The interesting thing is when I swap around the ESC signal wires from the other motors into Main Out 3 (where motor 3 is usually plugged into) I get the same issue with the other motors.
I'm using a PS4 controller over the telemetry link (as I don't have my usual Tx with me right now). I think it's something to do with yaw control. When I do a radio cal using the PS4 controller it sets the trim for RC3 as 1100; the same as RC3_MIN. The trims for RC1, RC2 and RC4 are all around 1500 where I'd expect them. When I set the trim to 1500 on RC3 I still seem to have the same issue. I think it seems to be linked to the fact the throttle and yaw are on the same stick on the controller.
Does anyone have any thoughts on how to fix this or further diagnose the issue? That would be really appreciated!
Please let me know if you have any questions about my setup; happy to provide whatever info is necessary.