> Hi,
>
> I just observed something I don't know if it's a bug or a feature:
>
> Parking any JSBSim aircraft at KSFO and simulating global
> warming by setting the air-temperature to 45degC and dewpoint
> to 40degC and observing the properties
> /environment/density-slugft3
> and
> /fdm/jsbsim/atmosphere/rho-slugs_ft3
> one can see that there is a significant difference in the two
> densities of air. It looks like density-slugft3 is calculated
> correct as 0.00209 resulting in a higher density altitude and
> the rho-slugs_ft3 is still
> 0.002377 as the value for standard atmosphere.
>
> Since the rho-slugs_ft3 is used in the aerodynamic (qbar) and
> engine performance section hot and high conditions seem to be
> without any effect for JSBSim aircraft.
>
> Is this correct or do I get something wrong?
>
> Torsten
It's not a bug, as far as I remember. As I recall, JSBSim defaults to
using its own standard atmosphere. You have to tell JSBSim to use the
external atmosphere ("external" referring to the FlightGear atmosphere).
At that point, FlightGear would supply basic atmospheric values, such as
density, temperature, pressure, etc. I don't think it's possible to add
a bias or offset or adjustment to the JSBSim atmosphere itself, yet.
Look at JSBSim.cxx to see what's going on with the atmosphere.
So many planned features and upgrades, so little time ...
:-)
Jon
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