How to tune _FLTT, _FLTE and _FLTD

ArduCopter Copter 4.4
1

I’ve been studying this helpful document to improve my tuning efforts:

https://ardupilot.org/copter/docs/traditional-helicopter-control-system.html

It’s wonderful to finally know where the _FLTT, _FLTE, and _FLTD parameters fit in.

What the document doesn’t say is what these filters are doing - and how to tune them.

I believe Auto Tune calibrates one or two of these, but some appear to be unchanged.

How do we ensure these are set to the correct values?

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