For someone who hasn't done research on this topic, is it safe to assume that the CG should be somewhere near the thickest part of the wing? Will that always be a safe place to start with our models? In the 4 models I've assembled this year, all the CG's were near the (cord?), with two of them being slightly behind the thickest part of the wing (and these would have flown safely if the CG were moved up to that point).