Whenever I apply rudder using my TX the rudder moves as well as the left motor (Motor 1). They are not shorted/connected and I know this because they are soldered on separate PCBs (I am using Matek f405 wmo). It was working fine before and I have flown the plane many times.
If you want to see the issue that I am describing you can here.
That says wiring issue to me. Plane won’t run throttle outputs unless it’s armed, but control surfaces can be set to move without arming.
Just to rule out any settings try RUDD_DT_GAIN,0. This will turn off differential throttle with rudder input so there should be no software connection between them.
Just an idea
Is it possible that you simply armed your plane by your rudder ceck as you enabled “Arming by rudder” and you moved your stick to füll right with throttle low. After that the differential throttle will be enabled.
Plane would have not armed as it was not in a state to pass the pre arm safety checks. I have since moved the motors to different servo pads on my fc (s1 +s2 —> s8 + s9) and the issue has been solved. It’s a bit of a patchwork solution but it will work for now. I don’t think that it’s a wiring problem as I really made sure that the wires were not touching. I think it’s an issue with the fc. I will try to replace it to rule that out.
Again show a log.bin file from the previous setup / test with LOG_DISARMED**:** set to 1
Only with this information the experts maybe can analyse your problem correct before spending new HW (costs).