I purchased a Kadet Senior a while ago and I'm putting an OS 91 in it (I know, I've heard all the "over-powering" arguements already.) My dad is building a wing with less dihedral so I can do more with it than just fly it around and do loops and landing practice. Question is, what amount of right thrust should I put into the mounting of the engine? Should it be more or less with the larger engine? I don't fly much over 1/2 throttle unless I'm going up or holding steady pointed straight up but I'd like to have a plane that flies nice also. Thanks for the input in advance.

Kadet Seniors with a 91 will be great. I have one with a OS-91 4-stroke and it is a wounderful plane. I built it with no dihedral and it is a tail dragger. It is a four channel (you know with ail.) you can do some 3D with it , it will definately pull itself out of a hover.
I built mine so long ago, but I don't believe I put any right thrust in it.
Hope that helps.

You want about 2 degrees down thrust and 3 degrees right thrust in it.

More power--more right thrust.

If you don't put any right thrust in it--you'll have your hands full everytime you take off. It will be a ground looping plane from hell. Worse than a Cub. You'll be using a 14-6 prop or a 13-8 prop. Thats a lot more torque than the 10-6 you'd normally use with a .46 on that airplane.

Make is a taildragger and put ailerons on it. A Kadet Senior with very little dihedral and some ailerons is a blast to fly.

You know those diagonal braces on the side of the fuse behind the wing? On both sides of the fuselage there are diagonal braces made from 1/4" balsa.

Make diagonal braces on the top and bottom of the fuselage too. It adds a tremendous amount of torsional strength without much weight penalty. You'll have enough engine weight up front to counteract those few grams of weight in the tail.