ORIGINAL: joseph185
The CG has to be measured on the Mean Cord and where this point is depends on the shape of the wing. You cant just measure 1/3 back from the leading edge Model Aircraft News done an article on this exact thing in the April 2007 issue you will find this helpful the article is " Balancing Act" it shows how to balance with the different chord wings they are not all the same.
I'll have to look up that April issue of MAN. I probably don't have it, because I don't remember seeing that article and I subscribe to FLY RC magazine instead of MAN. I too like knowing exactly where the actual "0" balance point is, because when I go thru the tedious placement of all components, I want to know that I won't be having to start all over again to get it right.