That is one of the inherent problems of telling developers that they can’t use a custom external flight model, and that they must rely on your internal flight model that is supposed to cater for everything from helicopters to gliders, from the Icon A5 to the 747. As such, the internal flight model will probably never be ready. Generalization means being capable of everything but excelling at nothing, so as long as some developers will need very accurate physics for a particular plane, the flight model will not be finished.
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