Got it, The issue is that JSBSIM gets the external atmospheric model (/environment/params/control-fdm-atmosphere set to true in flightgear). I assume that imposes flight gear own atmosphere model to the FDM and THIS model is stuck after 100000 ft
Setting this value to false actually gets a more realistic atmosphere past 100kft. The question being what should be done in order to get the proper behavior and not breaking everything else in flight gear ? Should JSBSim be allowed to impose its internal atmosphere model or should the FG model be modified to model the proper values for density in the upper atmosphere ? > Message du 13/01/09 à 19h55 > De : "flying.toaster" <flying.toas...@voila.fr> > A : "Development issues" <jsbsim-de...@lists.sourceforge.net>, "'Development > issues'" <jsbsim-de...@lists.sourceforge.net> > Copie à : > Objet : Re: [Jsbsim-devel] X-15 issue identified > > Hello Jon > > > When looking at the /fdm/jsbsim/atmosphere properties I get constant P-atm > past 100000 ft (21.834 lbs/sq.ft) and constant temperature at 390 Rankine. > According to ideal gas law (P/rho = r*T with r=287 SI) this would lead to > constant rho, hence the high values for q all the way up... > > I'll look into the code this evening > > Enrique > > > Message du 13/01/09 à 13h47 > > De : "Jon S. Berndt" <jonsber...@comcast.net> > > A : "'Development issues'" <jsbsim-de...@lists.sourceforge.net> > > Copie à : > > Objet : Re: [Jsbsim-devel] X-15 issue identified > > > > > > > I have made some tests (I guess looking into the source code would have > > > done the same) and it so appears that JSBSim atmosphere is only updated > > > up to 100,000 ft. This explains why there is always aerodynamic control > > > for the X-15 up to 250,000 ft. I guess I'll have to modify the source > > > code for JSBSim atmosphere to get a truly ballistic behavior. > > > > > > Is there any kind soul to commit the modification once it is done ? > > > > > > Thanks in advance > > > > > > Enrique > > > > > > Hello, Enrique, > > > > The FGAtmosphere class seems to indicate that the atmosphere should be > > getting updated through 260,000 feet. Although, at the higher altitudes the > > properties should change more slowly. Is that not the case? Can you give an > > example? > > > > Jon > > > > > > > > ------------------------------------------------------------------------------ > > This SF.net email is sponsored by: > > SourcForge Community > > SourceForge wants to tell your story. > > http://p.sf.net/sfu/sf-spreadtheword > > _______________________________________________ > > Jsbsim-devel mailing list > > jsbsim-de...@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > > _______________________________________________ > > The JSBSim Flight Dynamics Model project > > http://www.JSBSim.org > > _______________________________________________ > > > > > > > > ____________________________________________________Avec Voila, réalisez en > toute simplicité votre videoblog ! http://video.voila.fr/mktg/?op=videoblog > > > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by: > SourcForge Community > SourceForge wants to tell your story. > http://p.sf.net/sfu/sf-spreadtheword > _______________________________________________ > Jsbsim-devel mailing list > jsbsim-de...@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jsbsim-devel > _______________________________________________ > The JSBSim Flight Dynamics Model project > http://www.JSBSim.org > _______________________________________________ > > ____________________________________________________Avec Voila, réalisez en toute simplicité votre videoblog ! http://video.voila.fr/mktg/?op=videoblog ------------------------------------------------------------------------------ This SF.net email is sponsored by: SourcForge Community SourceForge wants to tell your story. http://p.sf.net/sfu/sf-spreadtheword _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
