I had a IMP Claude at 17.5 pounds with a Saito 180 and apc 17x8. Nice power but not 3d. I have a Platt Zero at 18.5 pounds with a OS 160fx and apc 17x10 prop and its more than enough power for scale flight. Depending on your need for speed you should have more than enough power for good flying. I like a bit more pitch for my warbirds and suggest you try some different props to get what you want in performance.