With trainers this is the one plane I recommend an ARF, after that I recommend building, at least once. I have been given the trainers I have taught with and as far as flying I don't see a lot of difference between the 40 and 60 but I prefer the 60 size or bigger. If your going to build your first one then I like the big Sr. Telemaster. Easy to build, easy to fly and doesn't require a lot of power. I did have a .60 in mine but it was just an engine I had on hand. The big plane is fun to fly in the wind too.