rplumbo, I run the MVVS 49 with a zinger 11 X 4 wood prop and the MVVS pipe they sell with it. It is all stock, no mods to that plane or engine. If you need to decide between the sledge or the top cap, well I will not say because you know my opinion. But you will have plenty of people on this forum to help. Try wgeffon on here, he has both planes built from kits. Also, I started on the video for Morris today. It will have many 3D maneuvers with descriptions, a session devoted to how to do it and airplane setup and it will be available thru Morris just as their other videos are available. Even it any of you do not own a sledge it should be helpful in learning 3D maneuvers and how to do them. Jeff Williams