I am flying mine with just a Tower Hobbies 75 2 stroke and am very happy with the performance. It will climb out like a scared banchee and fly very fast if I want to. I did have to make a cut in the bottom of the cowl and add a piece of fiberglass between the 2 halves to make a bit more room for the muffler to clear. Other than that, there have been no issues and the plane always catches lots of attention at the field.