no i used a CG machine and tried to figured were at the root those measurement would fall. I think i started off at 7 inches at root. Mine is almost hands off inverted with just a 1/8 to 1/4 of stick movement to fly inverted. I have flown my battery as far back as behind the hatch, right now its on the gas tank. I only fly with 8-10 degrees on the elevator i also have a -2 on the throtle to elevator at idle for perfectly straight downlines otherwise it pulls to the canopy. I also fly wiht no expo on the elevator so i know i am doing soft stick movements on this bird for it not to also ballon and a very slow air speed on landings.