On 01/13/2009 12:43 PM, Torsten Dreyer quoted flying.toaster as follows: >> 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 ?
Yes, that's the right question ... and fortunately a good answer is available. Code exists to give FG an accurate model of the atmosphere, valid all the way to 262,467 MSL, i.e. 80 kilometers, i.e. the top of the mesosphere. (The limit could be raised even higher if anybody really wanted to go there.) This code has existed for years. It doesn't break FG. In fact, even if we consider only the troposphere, it gets rid of some ugly bugs in the existing model. The existing "environment" model does some crazy things, especially if the temperature is not ISA-standard. For more on this, see http://www.av8n.com/fly/fgfs/htm/bug-list.htm#bug-environment ------------------------------------------------------------------------------ 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
