Hi Jon,
I think it makes sense to clamp the integrated value in any PID 
regulator. Due to the fact, that for a PID-regulator the output is 
clamped, the integrator should be clamped to a value, which is 
sufficient for reaching the maximum allowed output (even if the D-part 
is working against the I-Part).
the below mentioned change would reduce the problem, but due to the not 
exactly 1G load for any runway in the world, the problem would still 
occur after longer times on the runway.

Maik

Jon S. Berndt wrote:
>>> One way to reproduce:
>>>
>>> - start fgfs with --aircraft=f16-3d
>>> - apply parking brakes
>>> - wait 10 minutes
>>> - fly and die  (elevator pulls *strongly* up)
>>>
>>> m.
>>>       
>
> I think I see at least one problem. The pitch channel integrates load factor
> error. Sitting on the runway, I see that a normal 1G load, multiplied by a
> 0.125 gain, and that is getting integrated. I believe that the load factor
> to be integrated on the runway should be zero - that is, in trimmed flight
> the integrator should not have any error to integrate. I'm looking into
> that, now.
>
> Jon
>   


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