--- Jim Wilson <[EMAIL PROTECTED]> wrote:
> Tony Peden said:
>
> >
> > The trimming routine is not the problem.
> >
> > Jim W. said it himself, the behavior changes when -9999 is set as
> the
> > altitude. Well, the only place such logic exists is in src/Main,
> not
> > src/FDM. I think eyeballs need to be directed that way.
> Furthermore,
> > nothing regarding the trimming routine has changed for at least
> three
> > weeks.
>
> They have been. The problem has been there unnoticed for several
> weeks. And
> yes it can be "fixed" there. This is a problem that has been there
> before,
> and seems to be unique to JSBSim.
>
> >
> > I really am at a loss to explain why we have to go through this
> "blame
> > the trimming routine" routine every time it fails. The trimming
> > routine does not do magic, it's just a 6-dof zero finder, something
> > every engineer learns how to code in school. It is not a mysterious
> > black box. As such, it is no different than any other piece of
> code:
> > GIGO.
>
> My question and I think Mathias' question is do we need this test in
> JSBsim.cxx?
>
> if ( fgGetBool("/sim/presets/onground") )
> {
> fgic->SetVcalibratedKtsIC(0.0);
> fgtrim = new FGTrim(fdmex,tGround);
> } else {
> fgtrim = new FGTrim(fdmex,tLongitudinal);
> }
>
> What JSBSim does that YASim does not is if the aircraft is a little
> too close
> to the ground at initialization JSBSim hurls the thing up in the air.
> Why is
> it that only JSBSim reacts by flipping over the Cessna?
Exactly. GIGO.
>
> Best,
>
> Jim
>
>
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>
>
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