Originally Posted by chop stiX
this is awsome.but how accurate is it with KFM airfoils?
The MAC calculation is airfoil agnostic, it is based on the format of the whole wing, not the airfoil.
That said, the percentage ahead of MAC that we use as CG is airfoil-dependant (and parametrizable in my calculator), so you can adjust.
I have no personal experience with KFM airfoils, so anyone with more experience with KFM can jump in.