I am used to the "You can't do that! That phrase sets me in motion. The 3 blade props make a scale warbird quite viable in the 40+ size. A short coupled (radial engined) fighter usually benefits from some sort of ballast. I was pleased to find that my Kaos had a 26oz wing loading with the 25 and the 5oz ignition/battery. I use a 10oz tank and have never run out of fuel. The 40 size gas was the inspiration for converting engines. My 25 with the ST carb is about 32oz. Sounds like a neat "Class flyer" Prof G