Rodney and Chuck have it right, the CG depends on the location of the neutral point and how much stability you want, so the calculator is the way to go.

Note that the critical part is not the overall length of the fuselage, but the length of the tail arm.

I have done calculations by hand on every plane I have flown for the past 25 years, and guess what I've learned? The aeronautical engineers are not wrong. I don't trust the magazine plans or the kit plans, I always do the calculation.

Jim