ORIGINAL: maukaonyx

I've got the OS 120 Surpass III, basically the later version of yours. It has just a couple tenths hp more than yours, but also weighs couple ounces more. I am having lots of fun with it powering a Yak-54 with 950 sq in of wing area and the plane weighs about 9 pounds 3 ounces. It has the power to weight ratio and wing loading making it fly very light and 3D capable but not overly so. I'm saying more power would be better, but it is still fun to be able to do some 3D with it. So I am suggesting that you find an airframe with this kind of wing area and AUW to be able to 3D. Less area, higher weight, etc, and pretty soon the 3D plane turns into a nice IMAC/sport pattern plane with that engine. I'm not even mentioning the brand of my plane because it is not available anymore, so it's pointless. Good luck. Jon