Potencial Thrust Loss and RCOUT very different between motors

Hello everyone

I builded two drones, one is a quad (F450) and other is a hex (ZD850)

During flight, the log shows potencial thrust loss message.
When opening the logs we can see rcout very different between motors.
Using the auto analise in mission planner we can see the messagem below:

Test: Motor Balance = FAIL - Motor channel averages = [1462, 1461, 1565, 1664]
Average motor output = 1538
Difference between min and max motor averages = 203

On both drones this message is shown.

I have researched this forum and followed the instructions to check motor alignment, center of gravity and esc calibration, but even the problem persists.

I thinked it’s a hardware problem, but build two drones whith different hardware and the problem still persists

FC: Pixhawk 2.4.8
FW:Copter 4.0.07 Official
Frame: 450
Motor: A2212 13t 1000 kv
Prop: 9047
Battery: 3S 5200mah 35C
Esc: Simonk 30 A

FC: Pixhawk 2.4.8
FW:Copter 4.0.07 Official
Frame: 850
Motor: Garrtt 3508 370 Kv
Prop: 1447
Battery: 6S 16000mah 15C
Esc: Readytosky 40a

I put the logs and List paramants in this post. (unffortunely i dont have .bin of hex)

Files: https://drive.google.com/drive/folders/1A2FU3PtKH1_ytfCYD8q4WukFEVDvWfgI?usp=sharing

what could be causing this problem?


The quad is underpowered/overweight and has a mechanical Yaw bias. The later is usually from arm twist, motor mount twist or frame distortion. In rare cases ESC calibration can cause it.
Motor 4, which was already running around 1800µs at hover, maxed out which produced the thrust loss error message.

The hex only has Tlog which is useless to troubleshoot this but perhaps it’s the same problem.

BTW-Auto Analysis is years out of date, don’t bother with it.