[prev in list] [next in list] [prev in thread] [next in thread] 

List:       flightgear-devel
Subject:    [Flightgear-devel]  Atmospheres
From:       Slavutinsky Victor <vitosnet () mail ! ru>
Date:       2011-05-21 10:54:45
Message-ID: 1305975285.3101.16.camel () ubunted
[Download RAW message or body]

My tests with "Vostok" shows what current FlightGear atmosphere have
serious issues in means of high altitude flights. 

On reentry dynamic pressure inverts and have negative values on
60...50km. That can be tested by dropping any FG JSBSim based craft from
altitudes higher than 60km, from, say, 200.000ft.

Setting /environment/params/control-fdm-atmosphere to false in runtime
as Anders had propose does nothing. 

Setting /environment/params/control-fdm-atmosphere to false in set file
by other Anders proposition

	<environment>
		<params>
			<control-fdm-atmosphere type="bool">0</control-fdm-atmosphere>
		</params>			
	</environment>

makes atmosphere pressure to be equal to sea level pressure on any
altitude.

It seems to be inner FlightGear issue since standalone JSBSim tests do
not shows negative qbar in same trajectory conditions. It have other
problems, air pressure what seems to not depends of altitude if altitude
is high enough and equals 0.008310 on any high altitude, but not
antimatter in the middle.

Links of source files of standalone JSBSim test included.

vostok-reentry-test.xml http://pastebin.com/jxNuV952
vostok-reentry-test-runscript.xml http://pastebin.com/fKNupar3
vostok-reentry-test-reset.xml http://pastebin.com/bc60amQz
how-to-start.txt http://pastebin.com/4Yt2CaGV

With best regards,
           Victor Slavvutinsky


------------------------------------------------------------------------------
What Every C/C++ and Fortran developer Should Know!
Read this article and learn how Intel has extended the reach of its 
next-generation tools to help Windows* and Linux* C/C++ and Fortran 
developers boost performance applications - including clusters. 
http://p.sf.net/sfu/intel-dev2devmay
_______________________________________________
Flightgear-devel mailing list
Flightgear-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/flightgear-devel
[prev in list] [next in list] [prev in thread] [next in thread]