guys thanks for replying, I did alot of searching before buying this plane and know the reputation of the plane. dont know if i can actually handle it or not but thought the k&b needed a home. The plane is built according to the book and I am checking cg from the center of the wing and 2 1/4" back from there. The batt pack is four nicad aa cells mounted individually along the fuse(two on each side) as close to the front bulkhead as i could get. This got the batt weight as far forward as possible without going into where the fuel tank is. Was thinking about a bigger tank in the future and saving room up there. I built a thunder tiger trainer 2ooo and a UCD 60 both of which came out needing virtually no weight. This is why I can't see this one needing so much weight that it dosen't fit on the firewall. Also another thought when I got my plane the manual that came with it was for a 40 size did any of you use these specs instead? I got a 25 size manual from global before I put it together.