Here is an example command line used to start up FlightGear using JSBSim as
the FDM:
-fgfs --fdm=jsb --aircraft=X15 --units-feet --altitude=60000 --uBody=2000 --w
-Body=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
velocity - from the aircraft point of view. This essentially means that the