I would consider the World Models .60 sized P-51. It is about the same price as the H9, but has flaps. I can't speak intelligently on the H9, but the WM P-51 has an aluminum wing joiner. You should not have any structural issues with this. I fly this set up with a Magnum .91, and it flies well. I have owned a couple of Magnum 4-stroke engines, and I am happy with mine. They are not powerhouse engines, but they are reliable sport motors.