I agree with Exeter and Cambo. I have an O.S. .46 AX which I used in my trainer (a Sig Kadet LT-40). It is an excellent engine. I also respectfully disagree [] with Ken on one point. I do agree that you want to learn to fly "on the wing" but you can do that when the time comes by simply throttling back on the engine. While you are beginning the extra power can come in handy. If you don't need it you don't have to use it.

When I was first beginning I had a bad habit of cutting power and nosediving the plane on final approach. My trainer realized that when I was cutting power I would give the plane down elevator. Anyway, I did it once and before the trainer could let off the switch of the buddy box I had put the leading edge of the left wing in a tree. The plane spun 180 degrees. My trainer, by then, had control. He simply went to full throttle and flew the plane back up. When I finally landed we found that, other than one green leaf stain on the leading edge of the wing the plane had no damage. I am convinced that if I did not have the extra power available I would have constructing a new trainer. [:@]

Anyway, that is just my two cents. One thing you will learn in this hobby is that when you post a question and get ten replies you will get fifteen opinion.