I am very dissappointed!
As a real life engineer it was always a big mistery to me, what could be stored inside the aircraft.cfg file of aircrafts.
I realized eariler that our 747 do not have realistic fuel useage. I decided to improve the FDE a bit, got some scaled drawing of the plane, and the proper Microsoft SDK. I remade all the geometric, weight, fuel, loads, dimensions... constants after my materials very accurate. The result? ... : A much heavier 747, that needs more space for takeoff (lets say its ok until this point)... then it overtakes the Concorde, when get airborn. It flies at 300 KIAS at 2000' with minimum thrust and accelerate to 700 KIAS with full throttle.
I am very dissapointed... I had a theory, that the virtual FS aerodynamics is a simplified model of the real one, built up with simplified formulas and models, which needs exactly those constants and datas that are stored in the aircraft.cfg. I thought if I set them accurately, then I will get a superb plane that flies as accurate in the virtual sky, as the real one in the real sky...but not!
Afterall, I do not understand the importance of those hundreds of datas, that can be configured...
:'(