I have a copter which has been flying perfectly well since quite some time, although tuning hasn’t been done because of inadequate flight time.
This copter has been having no issues with fpv feed, motors heating up and yaw imbalance.
In 2-4 last flights, the yaw imbalance has been increasing more and more.
In today’s flight, I also saw issues with fpv feed. There were white lines and flickering effects at a range of hardly a few meters. The power was 800mw (analog vtx)
There are no yaw imbalance warning, but the difference in motor signals between opposite pairs is quite a bit.
The vibrations are low.
In the previous flight, the motors were also warm, unlike any other previous flight.
What can cause all of this?
From what I have figured out, the motors, FC, or escs are not the problem because none of them heats up (except motors getting slightly warm). The motors are also relatively new and all parts have less than 2 hours of flight time.
The radio is also calibrated and it is sending correct data.
All resistances between power wiring is low.
EDIT: heating up of motors is only observed in flight. during ground tests, there is no heating of motors, even at varying rpms.
Hard to help without a log file. .bin. Not a tlog. One flight is usually enough.
Warm motors is often tuning related.
Yaw imbalance is usually a mechanical offset, meaning the motors aren’t all pointing in the right direction. This can be hard to see and usually a mm at the tip of the prop can be enough to cause problems.
You didn’t notice that your Battery voltage was sagging to ~6.4V? Causing the outputs to max out due to lack of power and producing all those thrust loss messages.
I don’t see the point in posting this log. Review it for yourself and take action. Unless it’s for comedic value.
A bunch of arming checks disabled, starting with a battery not fully charged and also sags, Arming attempts in Land mode (I like that one), default Rate PID’s, Poorly performing GPS…
There is no frame damage or motor damage and even props have been replaced. Then what is the root cause of the yaw imbalance? Some parameter or something weird?
For the record: the yaw imbalance was caused by a few loose motor screws. With this fixed the FC was not fighting yaw anymore and this somehow fixed the motor warming and video artifacts.