HI, Does anyone know the E-Mail address for an expert who has written articles on balancing model airplanes?? Why?- I have a pusher-type plane "Challenger 11" from Nitro Planes. The instructions recommended C.G. at 105mm, but the cord of the wing is 303 mm which should make MAC at 85mm. Recently I have seen a simular "Challenger 11" crash. It had 15 seconds of uncrollable flight- I have no idea why- but I suspect it was an improper C.G. coupled with huge reccomended throws. Help please before maiden flight- thanks again guys!