Thanks for all the info.
I put a Saito 100 on my U-Can-Do 46. I did not need to add any weight at all. CG was well within the range per manuel. I am using a 14 x 6 prop. Works like a charm and I have all the power +. Problem is - I am only flying the plane with about 1/2 throttle. It has been pretty wind at my field, but even with wind, the landings are smooth and easy. Take offs are no problem - a roll of about 10 feet and up she goes. Tracks very smooth and flies easy. Still have a problem with vertical fly - seems like I have one control service off a bit - seems to roll left- but not much. I am very pleased with this airplane- Again thanks for your imput.......jb