ORIGINAL: stek79
Very interesting spreadsheet!
------ In fact, since ailerons move in opposite directions, when one pushes the servo arm in one direction, the other aileron will push the other arm in the other direction... so the servo in this case will not see any torque!
What do you think about that?
Oooops!!!! The loads don't cancel -- up aileron imposes a load and down aileron also imposes a load. They are additive, although not necessarily of the same magnitude. It doesn't matter if they are driven off opposite sides of the servo -- the servo shaft rotates in the same direction to deflect each surface & "sees" the resistance from each flight surface.