I agree about the 3W-24, but try to find a suitable airframe, using an engine that is over 10oz heavier is the problem. Even with the much lighter engine it is a problem.

An example is My H9 edge/RCS 140.. 12-1/2 lbs.
Stock airframe. If I stripped it and lightened it, I don't know for sure if I could get it in the 10 lb range. An extra 10 oz. is a lot on this size plane, with only 1010 sq. in. wing.

Don't get me wrong, I think 3W engines are great.