Hello folks. I’m building up a new drone, my second. Having some strange issues with one arm.
When I increase the throttle, 3 motors spin up but the fourth (top right) does not spin till about a third/half of the way through the throw. I have to set my arming speed to about 1300 for it to come on at arming. At that speed the quad will not quite stay on the ground.
This is what I’ve tried:
Trims are all at 0 on controller
Monitor shows correct output on controller/Cleanflight is the same
Swapping RX – no change
Swapping Controller – no change
Swapping FC – no change
Swapping PDB – no change
Swapping PDB and FC together – no change
Swapping ESC with new – no change
Swapping black motor cables(esc cables still in correct position on FC) - problem changes to new motor – this would seem to indicate it is not a motor problem
Changing position of esc cables (black motor cables in correct position) – no change
I did try to calibrate the esc’s but did not get the same tune that is described in tutorials.
I always give a tug on a new joint, but ok I’ll check again.
I did swap out the esc completely on that corner of the pdb with a new one, no change.
Something I just remembered that is odd. When I first discovered this problem I had the FC wired up but not bolted down. I was holding it level when I spun up the motors. The three were spinning and the fourth not. If I moved the FC around, tilting it forward and backward, side to side, the problem motor would twitch and spin a little.
Not really sure what that tells me though since I’ve had this problem with three different FC’s.
Did you calibrate your FC?
It Sounds like. that the FC tries to balance the hole thing, but it wont work…
(Of course it wont work…)
Maybe this would work:
Try to spin your Motors (WITHOUT Props) up, and move your FC on all different axes…
Ive heard, that you need to calibrate your FC in Acro too.
I guess it was the esc calibration. A guy at HobbyTown told me they were not synced up. I ended up having to take off the working three and calibrate the bad one by itself. Now its working. Thanks for the help.
I know this conversation is quite old, but I’m very new to building drones and I have the same problem. You said it was resolved by calibrating the ESC separately, but I haven’t calibrated mine at all since I’m using DSHOT(1200). Would you suggest trying the same thing and, if so, how would I go about doing that? Thanks!