@Marc_Dornan wrote:
I have some very odd behavior when I set SERVO_AUTO_TRIM to enable on my Nano Talon flying the latest release of 3.9 on an Omnibus F4 Pro V3.
At some point in the flight, often at the very end, but not always, the auto-trim sets the deflection to maximum on my ailerons. The plane does not crash but it starts a violent oscillation as the FC fights this full deflection. It seems it counteracts the deflection and then goes back to fully deflected in an oscillating manner. I but retain control in FBW A. I land, reset the aileron trim to 1500 (center) take off and fly and the same thing happens. Here is a pic of the deflection when I land with my radio sticks centered.
Here is a log of a flight when this happened.
It is not spurious – it happens every flight pretty much. Since I disabled the auto trim setting I have no issues. The plane flies pretty well in wind even – it still needs a proper tune, which I can now do as I have solved this issue. It is a well behaved plane.
None of my other planes exhibit this behavior.I wonder if it is related to the small size of the Nano Talon - cannot think of another reason. I think it is worth looking at as it could have some nasty outcomes, potentially.
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