The effort is built around LaRCsim (Langley Research Center Simulator), which was written
by Bruce Jackson of NASA Langley's Dynamic & Control Department and is intended to be
extremely versatile.
Unlike more standard 'arcade' type codes, Mr. Jackson's codes solves the full six degree of
freedom equations of motion.
He does an excellent job of modeling such complicated effect as oblateness of the earth,
landing gear spring and damping forces and many atmospheric effect, such as turbulence. He
also has such 'extras' as ground steering and braking.

Although this code fits very closely our requirements it had two main drawbacks, a very
limited graphics capabilities, only one aircraft model, a North American Navion whose
data was only valid around an Alpha of 0 º and speed of 100 kts.

Pat Manzi has worked on expanding the aerodynamics effort, so that alpha and speed
limitations are reduced.

I have modified the code so it's reads all the coefficients from file, so it's easy to test
new models using FLYG-sim.