Lots of techie types on here, so this should be fun...

Can anybody relate the CofG position to the MAC (mean aerodynamic chord) of current pattern planes like the Black Magic, Pinnacle, Astral XX, etc.? It used to be the rule of thumb was 25% of MAC as a starting point, but that was a few years ago and planes have changed along the way. I need this to do some weight and balance calcs on a couple of original designs I am drawing up and to (hopefully) ensure they actually sort-of fly OK on the first try.


Thanks,
Mark