I’ve copied all the air file table data using the legacy importer, and the engines work, but they are simply not powerful enough down low - so powerless that I can’t even get to rotate speed. If I start a flight in the air I can fly at Mach 4.7 up high - totally unrealistic. The old air file restricted flight to 3.4 at high level, and was very precise requiring flying by the book. Yet with all the data transposed into MSFS, the flight model is junk…
That is very true - MSFS read data differently, so result of injecting AIR values is unexpected. You can notice that some lines are highlighted in red because they equal to 0, or in case of tables - flat. That may cause issues with new flight model - FSX ignored these “empty” values while MSFS read them seriously, broken drag forces and wrong speed limits one of them.
Engines is a different story - fuel system became much more complicated and legacy values are not good enough for new script. RPMs/fuel flow values manual adjustments required.