I just bought this airplane and have to say it is great. I think I paid $129. Great plane for the price. Plan on putting an OS AX 55. Although I may entertain the thought of a four stroke. I don't have any experience with 4 strokes but am interested in getting into them. Would a 70 size 4 stroke be a good size for this plane? Also. The instructions are a little( OK a lot) shy when it comes to installing the wing. They say install the wing as shown in the picture. Well there is covering over the wing hole in the fuse. I would assume that you cut the covering out about a quarter in inside the hole and iron the covering into the hole for the wing. I'm fairly good at building and it seems logical but I just want to check before I go slicing. Have read some of the other threads and there seems to be some concerns about the muffler touching the fuse and cutting out the cowling. Is this a concern for the OS AX 55? Also some talk about the pitts style muffler. Is that for the four stroke? Any other tips will be great.