You also need the heaviest weight at the maximum velocity you expect to have the flaperons extended to 45 degrees. So if this were a glow plane weighing 5lbs moving at 45mph and you extend the flaps to 45 degrees, that is the most load they will see. Now I know that's a little exaggerated but it gets the point across. Even at 5lbs 45 degrees will make for some extremely slow landing speeds and one heck of a short takeoff run.

To give you a better idea, most retract servos run around 90 ounces of torque. It has to compensate for the speed of the plane, the weight of the retracts in transition, it can also survive if one of the down or up locks breaks. I've seen a couple of 8lb P-40's using standard 50 ounce torque servo have their flaperons lowered to roughly 40 degrees at better than 40mph and the servo easily survived. Yes, there was a mix for the elevator to compensate for the pitch change, which at that speed would have been pretty violaent