i got a 9402 on the rudder (set up properly though with 140% ATV servo travel with about 45 Degree rudder movement) this gives aprox 25% more power at the rudder than the stated servo torque as the machanical advantage is about 25% in favor of the servo. IE the rudder moves less than the servo.

if it were the other way round then you would have 25% less torque.

Dave