I have a good running Thunder Tiger .46 Pro with 11x7 prop on my LT-40 and it will hang on the prop. I have even gotten it to torque roll a few times. This isn't the type of thing you try if you are still learning to fly. I have completely mastered my LT-40 and still love to fly it. Once you get really good with it you can max out the throws and have fun getting it to do crazy things you never thought a trainer could do. To prop hang you basically get some speed going and pull straight up until it starts to slow down. If your engine has enough power you will be able to hold it there for a bit before it starts to fall. Lots of fun. This plane can definitely handle a .60 but the added weight will hurt the good flying characteristics and make it harder to fly. I don't suggest it if you are just starting off. I had an OS .70 four stroke on mine for a little bit for break in purposes and the plane would take off in about five feet. It was a blast to fly with all the power but overall it didn't fly as well or as easy as with the recommended size engine. Much more of a handful. You wouldn't hurt the plane at all to put a little more power on it such as a Webra .50 - this plane is as big as most .60 size trainers so it can handle it. Just be careful that whatever you choose is in the same weight range as the typical .46 size engines that are recommended for this plane so you retain the great flying characteristics.