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JSBSim JSBSim
JSBSim is an ongoing attempt at producing an OO Flight Dynamics Model (FDM) JSBSim is an ongoing attempt at producing an OO Flight Dynamics Model
to replace LaRCsim as the default FDM for FlightGear. It can also be used (FDM) to replace LaRCsim as the default FDM for FlightGear. It can
standalone. also be used standalone.
JSBSim uses config files to represent aircraft and engines. Also, the flight JSBSim uses config files to represent aircraft, engines, propellers,
control system is described in the config file. Normally, for use with etc. Also, the flight control system is described in the config
FlightGear, the config files are named this way: file. Normally, for use with FlightGear, the config files are named
<FG_ROOT>/Aircraft/<aircraft name>/<aircraft name>.cfg . Engines are named this way [case is significant]:
like this: <FG_ROOT>/Engines/<engine name>.dat .
Aircraft and engine config files are present in the FGFS-Base package which <FG_ROOT>/Aircraft/<aircraft name>/<aircraft name>.xml
must be downloaded from the FlightGear web site at www.flightgear.org or one
of the mirror sites listed there. Engines are named like this:
<FG_ROOT>/Engines/<engine name>.xml
Aircraft and engine config files are present in the FGFS Base package
which must be downloaded. See the FlightGear web site for more
information.
How to run FGFS using JSBSim How to run FGFS using JSBSim
All the various FDMs are currently compiled into FGFS. You can specify which All the various FDMs are currently compiled into FGFS. You can specify
FDM you want at run time. You can also specify which aircraft you want. which FDM you want at run time. You can also specify which aircraft
Currently, for JSBSim only the X-15 is available, and possibly the C-172. you want. Currently, for JSBSim only the X-15 and C-172 aircraft are
Here is an example command line used to start up FlightGear using JSBSim as available. Here is an example command line used to start up FlightGear
the FDM: using JSBSim as the FDM:
fgfs --fdm=jsb --aircraft=X15 --units-feet --altitude=60000 --uBody=2000 --wBody=120 fgfs --fdm=jsb --aircraft=X15 --units-feet --altitude=60000 --uBody=2000 --wBody=120
[Note: uBody is the forward velocity of the aircraft, wBody is the downward or,
velocity - from the aircraft point of view. This essentially means that the
aircraft is going forward fast and has an angle of attack of about 4 degrees
or so]
The above command line sets up the initial velocity and altitude to allow fgfs --fdm=jsb --aircraft=c172
the X15 to glide down. Note that if you fire up the engine, it will burn for
only about two minutes and then run out of fuel - but you will go very, very
fast!
Check out the JSBSim home page at www.hal-pc.org/~jsb/flightsim.html. Please [Note: uBody is the forward velocity of the aircraft, wBody is the
report any bugs to jsb@hal-pc.org, or apeden@earthlink.net, or post them to downward velocity - from the aircraft point of view. This essentially
the fgfs-devel mailing list. means that the aircraft is going forward fast and has an angle of
attack of about 4 degrees or so]
JSBSim is written by Jon S. Berndt and Tony Peden with contributions by The first command line sets up the initial velocity and altitude to
other FlightGear programmers, as well. allow the X15 to glide down. Note that if you fire up the engine, it
will burn for only about two minutes and then run out of fuel - but
you will go very, very fast! The second command line example will
start up the C172 on the end of the runway.
Check out the JSBSim home page at http://jsbsim.sf.net. Please report
any bugs to jsb@hal-pc.org, or apeden@earthlink.net, or post on the
jsbsim web site using the SourceForge bug tracking system for the
project.
JSBSim is written by Jon S. Berndt and Tony Peden with contributions
by other FlightGear programmers, as well.