In looking at specs for a number of 20 to 30 cc gas engines to replace my 1.2 4 stroke ($300 + replacement cost) I have determined that the Zenoah G-26 has the best bang for the buck. It turns a 16 x 8 at 8900, my 1.2 4 stroke turns a 15 x 8 at 9300. I realize the G-26 weighs a pound more, but I can use a much smaller fuel load on board the plane. Any comments on this conclusion please?