Failed take off with large quad

ArduCopter Copter 4.6
21

This isn’t right. Those Power Modules are supposed to produce a relatively stable 5.2V. This never does and it slopes off with input voltage which voltage regulators don’t do until they hit the drop-out voltage.

Power
Power1678×503 76.2 KB

Is this Power Module even functional now? Measure the output voltage with a meter.

22

Let me check this.

So, what should an example VCC graph look like?

23

Like this. I only have a Rover running today that logs Vcc (CubeOrange+) so I’ll use that as an example.

Power
Power3384×1028 170 KB

If I ran it longer to deplete the battery the Vcc voltage would remain relatively constant.

Here is another one from a small quad. Note the Vcc is within a 100mV as the battery depletes. And this is a cheap Power Module.

Power quad
Power quad3391×1049 254 KB

24

Actually, this The cause and solution are simple. If the VCC voltage were completely restored, the system health and flight performance would be better, right?

25

….I think doesnt work that way. If your ESC require calibration (some ESC need it, some not, depend of wath are you using), first you set up your PWM range, then you calibrate your ESC.

26

İ set the pwm range. 1050-1950 for x9 plus motors.

27

I suppose that’s a rhetorical question.

28

This is the correct method for the Hobbywing integrated motor sets. No need to try calibration.

29

@wampelt get a Datalink v2 in order to get ESC RPM telemetry out of those ESCs
Then Use the corrected AMC Parameters provided. I’m pretty sure that the parameters in file 15 need improving
x9plus_20260513_193218UTC_20260518_002501UTC.zip (71.1 KB)

@alberto.munizaga These ESCs do not need calibration. And AMC has motor test functionality that is simpler to use than the one on MP.