I have tested
ground_crosswind_effect_zero_speed = 45.57ground_crosswind_effect_max_speed = 91.13
The plane behaves similarly to the original FM but the crosswind effects happen somehow more progressively with the plane speed rather than abruptly when reaching a given speed. I do not know which of both is more "real", tbh, but the more progressive one gives me more "warnings" to start counter it. Still is quite a challenge to take of with crosswinds up to 8knots, anything above that speed is impossible if you do not have a wide enough pist to change direction towards the wind.