R2champion
torque is the product of force multiplied by distance (actually the distance perpendicular to the force)
The servo can always make hte same amount of torque. The FORCE measured at the pushrod will vary with the length of the arm. A 50 ounce-inch servo with the arm at a right angle to the pushrod will stall under these conditions:
1 inch arm, 50 ounces of force, 5 inch arm 10 ounces of force.
Of course the total available travel of the pushrod also varies with the length of the arm.