It is adequate powerwise with the Thunder Tiger GP 42. Not that it is dead slow, but rather you can really throttle back and fly pretty slow. The reason I would go with a .60 is that it needs nose weight anyway, (if I remember correctly almost 3 ounces). The extra power of a 60 would help in takeoff situations where there is high grass. Once mine is up in the air with no drag from the grass, its not bad. It's great going way up, doing a half loop and trying to keep it inverted. She really wants to fall out of inverted, but it can be done. I've never done it close to the ground. Windy days are tricky anything over 12 mph. That wing has so much wing area its easy to tip over while taxiing if the wind get under the wing. If I were building one now, I would put solid pushrods to the throttle as well as the nose wheel. Otherwise a great plane. I learned how to fly on it and still have it in flyable condition.