Hey Fred, I have backed off the idea of 6 volts, got to thinking about my chargers (4.8 volt) do not have a 6v charger so the heck with it. As for the servo, someone recommended the futaba s3305 ($34.99 tower) 99oz of torque at 4.8 v. How much torque do i need for the rudder with 4.8v? Watching some servos on ebay at the moment..