I have successfully built several tricopters but I have recently had problems with the tail motor running sporadically and revving up too fast once the FC is armed at idle speed. It also makes an disconcerting noise which sounds like a rumbling. I have trouble shot and replaced the motor (both brand new motors), ESC, checked the output voltage and resoldered the power leads and signal wire to different spots on the PDB with no changes to the performance. I’ve also checked all the typical issues (nothing touching the copper windings, I used a smoke stopper, nothing stuck in the motor housing, etc.) The other two motors and the servo work perfectly. This has happened to me on one other tricopter as well. This version has a Kakute F4 V2 with EMax 2205 motors running DRonin for tricopters.
Please help! Anyone know what would make the tail motor display this behavior?
Thanks