He's right! I'm am sold on gas now that I have been flying them for awhile, but that is simply a glow plane. A YS 120 is an awesome performer. If you want rediculous vertical put a YS 1.40 in it. I had both of those two Engines in mine when I had it. If it weighs 10.25 now with a gas it will be much better with a glo, and it will have alot more power. Planes in that size range just aren't designed for gas engines. You really have to get over about 40cc to see any real performance with gas engines...generally speaking...there are a few exceptions though.