I have a dilema. I have an ultra stick 40. The manufacturer recomends a two cycle engine up to .58. I've read that a 61 works well on these planes provided the battery and the rudder and elevator servos are rear mounted. I was looking at the tower 61 for this plane but saw the tower 75 which is actually lighter than the 61 since it is a bored out 61. The price difference is only 10.00 and the HP difference is significant. Buying the 61 isn't such an obvious choice now. If there is no such thing as overpowering, why would this combo not work?