I'm sure it'd fly like a bat out of hell with a larger engine. But I'll be using a 40-size Magnum 2-stroke! I may eventually put in my 52 RS but this would necessitate changing the motor mount (and all that THAT entails). I'm not interested in aerobatics at all but rather hope to learn more about the "good piloting" required to keep an underpowered plane in the air during scale flying. Since my ultimate goal is to fly scale WWI A/C which were nearly all underpowered and finicky to fly, I think a 40-size should suit my Spacewalker nicely.