On Monday, August 16, 2010 08:14:04 pm Ron Jensen wrote:
> On Monday 16 August 2010 20:56:17 Jon S. Berndt wrote:
> > > Hi Hal,
> > >
> > > Would you elaborate on the error in CDde? It looks like the same CDde
> > > used in
> > > most aeromatic aircraft so if there is an error in the P51d we (still)
> > > have
> > > an error in many jsbsim aircraft.
> > >
> > > Thanks,
> > > Ron
> >
> > It's probably the situation where if the elevator has a negative
> > deflection, that is multiplied against the CD and you get a negative
> > drag.
> >
> > Jon
>
> The version on gitorious has the elevator wrapped in absolute tags so there
> shouldn't be a negative drag problem.
>
> Ron
I was getting negative values in spite of the <abs> </abs> tags. So there
appears to be something wrong with the <abs> tag at least with the version of
stuff that is in FG git right now.
This was easy to fix by using a table like this:
<table>
<independentVar>fcs/elevator-pos-norm</independentVar>
<tableData>
-1.0 1.0
0.0 0.0
1.0 1.0
</tableData>
</table>
But the <abs> tag problem needs to be fixed.
Hal
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