Jon Berndt said:

> > Thanks for the explanation.  This does more than I originally thought.
> >
> > Would some sanity checks at the JSBSim.cxx level help?  I'm not
> > sure what they
> > would be,  other than the one mentioned before (that relates to
> > this latest
> > bug): "make sure we have wheels above the ground".  To test that
> > we'd need to
> > know where the wheels were (e.g. z distance from the vrp).
> >
> > Best,
> >
> > Jim
> 
> The VRP is really for FlightGear only.  We know where the CG is and
> everything else is relative to that. We explicitly calculate the offset from
> the CG to the gear contact points during the ground reactions calculations,
> so we do know (or can determine) the Z _offset_ of the gear contact points
> below the CG -- which, in turn, would allows us to calculate where the CG
> would need to be placed to make sure the gear would be above ground. If the
> airplane is on a steeply-incline triangle near the edge, all bets are off.
> 

That makes sense.  When and if gear compression modeling: will that complicate
this or vice versa?

Best,

Jim


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