Kind of a long story - I bought it used and it had a TT 42 on it. I have TT 46 and thought they were the same size (they aren't). I recovered the SE and wished I would have known it then. The SE has a fixed engine mount and a greatplanes mount won't work because the fuel lines are in the way. I didn't want to modify the firewall and mess up the covering job I had done. It is the second covering for me and I happy with the way it turned out. I could have trimmed the engine mount but really didn't want to do that or spend any more money. Soooo I put the 42 back on it. I do not fly 3D so I figured the 42 would do just fine.