Believe it or not I can actually fly my Cub like a Cub is supposed to fly with my OS 81 fs even if it is over powered...Yes I could fly it on a 46 2 stroke if I wanted to but I would sooner fly it using a bigger four stroke turning a bigger prop slower..It sounds better to me and that is my choice with my plane .. I have never thought of 3 Ding my Cub just because I have a bigger motor than it needs...I also fly it from floats and the extra power comes in handy there... If you need to add weight to the nose to balance the plane it dosent hurt to add a little extra motor instead...I think the 46 is a little on the underpowered side although it will fly the plane...It depends on how hot the day is and what your altitude is as well...Why push the envelope if you dont need to ?