Jon S Berndt said:

> On Mon, 5 Apr 2004 23:15:42 +0200
>   Mathias Fröhlich <[EMAIL PROTECTED]> wrote:
> >
> >The onground property is now ok.
> >You can reset now JSBSim aircraft.
> >Thanks for the fix!
> >
> 
> ??
> 
> Was it "bad data"?
> 

All that was bad was a flag caused the trim routine to be called or not called
with a "tGround" parameter...whatever that is, which was discussed in this
thread yesterday.  Questions are still unanswered, so I'm sure that sometime
down the road the trim routine will rear it's ugly head again.

David's explanation is relevant but not entirely, because this issue was
showing up doing a full reset.

I think, that maybe this could be resolved by doing as Andy described earlier.
 In other words know where the gear is and get it above the pavement (ground
elevation) before the simulation starts.  Then and only then drop the sucker,
start the simulation, and let it settle.  Sorry for the simplistic explanation
and my apologies for suggesting that JSBSim could do something about bad data
instead of just crashing random aircraft.  As it is now we need to test every
single JSBSim aircraft every time a modification is made to flightgear because
the trim routine is lacks robustness.

Best,

Jim


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