ORIGINAL: Charlie P.
I start at 25% of wing cord and then fly it. Take an upline at a 45° angle, roll inverted, stabilize the upline and then let go of the sticks. If it noses up it's tail heavy. If it noses down it's nose heavy. Adjust and fly again. If your tank isn't near the C.G. test at less than 1/2 full.
Anything else is an approximation.
Works with slab or tapered wings, and I only have one swept wing model and that I use the recommended C.G.
This is why I posted the the CG Calculator. It puts you dead on without Voodoo or guess work and you no longer have to listen to the peanut gallery with every odd ball plane you will ever get when you ask someone about CG. This works with tapered wings as well as constant cords and swept wing. Just put in the numbers, punch a button and Shazam, there is the correct CG. Or you can do it like Charlie, I'm sure the 25% trick works great. I know people that have been doing that for 54 years without ever having a problem.
