Verifying stability & understanding MagFit / AutoTune

ArduCopter Copter 4.6
1

Hi everyone,
I’m looking for some help verifying whether my copter setup and tuning look stable, and I also have some confusion regarding AutoTune and MagFit.

Hardware Setup

Frame: S500 quad
Motors: Sunnysky 2212 980 KV
ESCs: Hobbywing XRotor 40A
Flight Controller: Cube Orange+
GPS: Here3+
Battery: 4S 6800 mAh 40C LiPo
Propellers: 11x4.7
RC Receiver: FrSky X8R
Transmitter: FrSky Taranis X9 Lite

Current Configuration Status

  • Followed the Methodic Configurator completely

  • Completed QuickTune

  • Notch filtering configured based on the AMC guide

The copter flies, but before proceeding further, I’d like help from experienced users to verify whether the copter looks stable with the current settings.

AutoTune / AMC / MagFit Confusion

  • I attempted AutoTune via Mission Planner after completing till step 23 of AMC, but it failed and suggested manual tuning.

  • I then tried tuning via Methodic Configurator.

  • AMC is asking me to perform a MagFit check.

  • I downloaded the MagFit script as instructed, but I’m confused about the figure-8 flight:

    • Should the figure-8 be flown manually in Stabilize/Loiter?

    • Is there any specific mode or setup required for MagFit data collection?

Any guidance on:

  • Verifying overall stability

  • Best practice for MagFit data collection

  • Whether AutoTune should be retried or manual tuning is recommended for this setup

  • I have to add a payload of about 200 grams to this setup the current setup weighs 1.6kg according to eCalc the setup will be able to handle but will the copter be stable with that do i need to redo the entire tuning again with payload?

Logs

Thanks in advance

2

Welcome to the comunity

There is magfit documentation links in blue on the two magfit steps in AMC.
Have you read that?

The figure 8 can be done automatically via the script that AMC automatically downloads from the internet and uploads to your FC or you can do it manually.
As you prefer. As long as you perform yaw movements combined with forward flight.

Manually you should use stabalize or ALT_HOLD. Those are the safest at this point of the tune.

Remember that quicktune requires some wind. And autotune requires no wind or as little wind as possible.

I do not recommend manual tune for beginners. Autotune is great when done correctly after all the steps that AMC recommends.

You no not need to redo the tune when adding payload.

The tune must always be done with minimum payload.

3

I found this guide for using the magfit script Scripted MagFit flightpath generation - #2 by Yuri_Rage hope this one is to be followed

I have already completed the notch filter flight and quicktune flight and checking the vibration levels they seem to come under 15.

I have attached the logs of that flight in my post can you just help me verify if copter is performing well?

Also based on my configuration how much payload can it take?

4

You say that like it took you some searching to do! Why waist time searching? All the relevant documentation is right there in front of you, just click on it an read it:

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Payload depends on a lot of factors. But a subscription of “eCalc multirotor” for 2€ and get a good answer