YASim file

Good day.
Interesting in modeling for FlightGear.
Where can I find the description of method that FlightGear uses when
it take the aircraft with YASim file.

I've found that this approach is based on geometry and mass
information and simulate the airflow effect.

But how the simulator works with this file?
How many parts it  brakes the wing for calculation?
How it calculate velocities etc?

Please, if not disturb you so much, where can I find info?


-- 
Andrey


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