This is sufficient to keep the wings level in cruise at 3000 ft, 2200
RPM; the value will have to change as we make changes to the model.
Note that a stock Cessna 172 does not have an aileron-trim wheel
inside the cockpit; to set the trim, you actually bend a sheet of
metal by hand when the plane is on the ground.
preferences.xml, and added <sim>...</sim> tags back into the *-set.xml
files. You need the newest FlightGear CVS changes to use together
with these changes.
more intuitive. We switch to an include in the preferences.xml to include
the default model, and then if the user specifies --aircraft=, that is
expanded immediately so portions can be overwritten by subsequent command
line options.
This required a slight format change to all the *-set.xml files.
