John Denker wrote:

> That's an interesting question.
>
> So there's not a clean division between "instrumentation" and
> "other".
>
> 2) But wait, there's more.  The FDM's model of the atmosphere
> model is blissfully ignorant of the properties of the actual
> air mass.  If you change the local barometric pressure, the
> MAP that you observe (with the engine off) should track the
> barometric pressure, but it doesn't.
>
> You can easily verify this while sitting on a runway with
> the engine turned off.  Changing the barometric pressure
> affects the altimeter but not the MAP.
>
> 3) Tangential remark: the c182r engine continues to run at
> 100,000 feet.  In fact with the throttle at idle, the engine
> spins up to thousands of RPM.  It's quite comical.

Please make bug reports here for JSBSim:

http://sourceforge.net/tracker/?atid=119399&group_id=19399&func=browse

At least they can be tracked there, although some of the ones listed need
toe cleaned up.

> 5) I'm not even going to ask why a single copy of FGFS has at
> least three different atmosphere-models (one in the Environment
> directory, one for JSBSim, and one for YASim).

There's more than that: JSBSim has two Earth atmosphere models. Some of the
simulators we use in my day job also have several selectable atmosphere and
wind models. JSBSim needs its own atmosphere model because it maintains the
ability to be run on its own in a batch mode, and also because it tries to
be a drop-in FDM for other general purpose simulators (see the JSBSim list
this morning for another example of that).

It appears that we need to do some work here, though. Thanks for pointing
these things out, and please do report these at the above link. It really
helps our development process.

Jon

--
Jon S. Berndt
Development Coordinator
JSBSim Project
www.JSBSim.org


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