The c.g. was right where the manual said it should be and I didn't have to do anything to the plane to adjust it. This was with the stock nimh batteries. I suppose if I had one large 4 cell lipo battery then I would have to experiement to see where in the battery compartment to strap it down for the same c.g.

Just a side note, I don't think the Great Planes C.G. Machine is worth the plastic it's made of. I believe a good finger tip measurement in calm weather 3.5 inches from the wings leading edge could produce the same result of the great planes machine.

And now that I think about it, I probably could have made my own machine out of scrap lumber using a tape measure to get the balance point.