> Also note that the FlightGear model, whether or not extended > in height, is a one-parameter model which (to put it politely) > does not adhere to the laws of physics. It puts out wrong > answers whenever the temperature differs significantly from > ISA standard day.
JSBSim has, for a long time, had an implantation of the NRL MSISE atmosphere model, ported to C++ by Dave Culp. It's been used periodically, but we haven't moved to that yet. You can read more about it here: http://en.wikipedia.org/wiki/NRLMSISE-00 We need a way to select which atmosphere model to use - a flag, I guess. And it needs to be tested more thoroughly. In my day job, lately, I've been comparing the use of the GRAM 1999 atmosphere model with the use of the GRAM 2007 atmosphere model, and how it affects the flight performance of the NASA Orion Crew Exploration Vehicle during low altitude aborts. Interesting stuff. Unfortunately, the source code for those atmosphere models is not freely distributable. Anyhow, this is certainly an area in FlightGear where more attention could be paid. Jon ------------------------------------------------------------------------------ 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
