CG was right at factory specs, I was using a 4 cell JR flight pack 1000mah, to get cg my pack had to sit right behind the tank.
I was running 4 JR NES537 and 1 Futaba 3003 for throttle, i never actully wieghd this plane, i didnt have a digital scale when i owned it.

Me and about 3 other guys think this f-40 was a lemon because its been threw 4 owners now, each one having the same issues, each owner running very differnet setups, First owner ran a saito 72 and had 3 flights on it, he broke the gear off every flight due to slapping it down on landing, I was the second owner and had 2 dead stick landings where i ended up breaking the gear off, other then thoughs two landings the rest were fine.

I think most the problems i had were due to tail flex so im actully considering this plane one more time, but like i said before i will never buy one used again, it will be new ITB and built to my standerds.