Spend the extra money and get the DA-50, I have mine and am going to mount it on a 27% Extra 300 85" wingspan, The DA-50 weighs 3.13 pounds with muffler and puts out 5 horse with a 22x10 prop, the FUJI 50stb wieghs in at 5.29 pounds with muffler and swings a 20x10 prop, FUJI advertises 5.2 horsepower that is sort of high I would like to see it on a dyno, but DA really puts out 5 but the Fuji is still questionable... If someone else could comment on the Fuji that has some experience with it...