Jaka, have to disagree with you on that one. You have to learn how to control throttle soon er or later and its easier to learn quick throttle response on a trainer than a sport plane. Also field conditions can vary widely and there were times at our field where the grass was getting long because of wet weather and the trainers with the weaker engines had a very difficult time getting up to take off speed. I have also had the winds sudenly whip up and I needed almost full throtle and 3/4 down elevator just to get the plane back to the runway!! Working with new flyers engines the only other brand engine I would suggest is the Thunder Tiger. They are not quite as strong as the OS but they are easy to adjust and reliable.[8D]