ORIGINAL: Osirisf16
I didn't understand your word "stepping". How the servo will help me on landing? I can buy an ultra torque servo and that's it, if i want more torque.
This is not a question of torque.
Servos move in discreet increments or "steps".
Each "step" causes a small movement of the control surface.
If the horn is long ( as suggested ) that small movement causes a relatively big change in deflection.
This can make a 3D plane hard to land, or at worst difficult to land properly.
By changing the linkages for maximum mechanical advantage, the "steps" produce LESS movement of the control surface.
So when you barely move the stick, the surface moves only a tiny almost imperceptable bit.
This has NOTHING to do with expo and torque.