I'd like to understand the math behind any 'servo requirement'. Given some side area of a fuselage - let's look at the rudder, the plane is traveling forward in KE flight (I assume this requires the most rudder torque?) , the air is pushing up on the fuselage around some lateral CG location, as the fuse is being yaw'ed to hold the KE flight. Does a 20oz-in servo work in this case, holding up a 11lb plane? Depends on the speed of the plane, the side area,… other factors. All the servo has to do is yaw the fuselage around a CG point - not lift 11lb. On the elevator, all the elevator servo has to do is hold the plane at some angle of attack. Perhaps the worst case here is a Snap? Anyone care to guess what the min requirements might be for a servo? I have been using 4031's from JR for a long time, working fine.. this was a pattern servo way back when. Now we have servos with 3X the torque, are they better? I'm sure they center better, but that a different discussion.

sc