I learned how to fly on my Kadet Senior as a three channel. When it came to moving into a four channel plane, an Avistar, I had no trouble making the transition. On the Kadet Senior I put the rudder on the right stick, same as one would have the ailerons. I think it flew great and taught me a lot. That Magnum would be great on the LT-40, but would also be sufficient on the Kadet Senior. I flew my Kadet Senior with a Thunder Tiger GP 42. Slightly underpowered, but once in the air it was fine. What the GP 42 has going for it is reliability and user friendliness. One of the best I've ever had. Another good match would be the OS 55AX, but I don't think you need to spend that much and still have the same amount of fun. You can get a Magnum 61 for $100. Thats not bad. One general thought of wisdom I've learned. You don't have to spend the most to get very good results. It's really more what you put into something as far as learning how something works. I've got a couple of those Magnum XLS 46, I've only test run them, but I think they run pretty good. Just a suggestion, you might want to add another servo for the nose wheel, put it on the rudder left stick channel. Would make it easier than having just a single servo for the rudder. Also easier to install. The "S" curve braided cable is a little tricky for getting it right without any binding. You could mount it lower and have a straight run to the nose wheel. Maybe even just use a rod.