OK, I finally made up my mind and bought a evo .46ex BB engine today. I thought I had an OS.46AX bought and it backfired so sprung for a new evo. Anyway it weighs more and its is going to throw off the center of gravity. Should I add weight to the tail or move the battery to adjust the COG? Any help would be appreciated. If it comes to heli's I can handle it but new to planes. Also what prop manual says a 10.5x6 up to a 11x8. I am running this in a hobbico superstar 40 trainer. Thanks in advance. Mike