ORIGINAL: carlosponti
the trainer i learned on was an arf had a supertiger 61 on it and i had to put lead in the nose to balance. it had a bolt on wing. if i were to try making a sport aerobat i would take out dihedral have a bolt on wing and split the difference between 40 and 60 and get a 50. then the difference in weight is going to be about the weight of you battery so you can mount it where you need the balance. clip the wings acouple of bays and increase control throws a bit. its amazing what can be done with a trainer if you are kit building it. you can get it to do just about anything.
The whole point of using a .61 is because I have a spare one, and do not really want to buy a new motor. If the plane is way too over powered I will strip the motor out and try to do something else. If I overstress the plane and it goes it, I just hope I can find it. I am spending a ton of time right now making the wing very strong to handle the extra stress I think it will be ok - I will take is very easy to start - should be a lot of fun playing the role of test pilot