I know this is old, but just to put in my .2 cents worth here since I introduces wing flexing in fs9/fsx. At that time I used air speed, and g-force to generate a flex amount that was then used to affect the key animation used in gmax (it's been awhile 😞 ). I think I did add a counter in the formula that would go up and down between each iteration of the values above to smooth out the animation so it wasn't so jerky. Erick Cantu also did some magic of his on the wings to attempt to smooth out the animation by breaking up the wing into more sections and limiting the amount of animation used.
Frit
