I'm using JR 8411SA on the rudder and 8231s on the aileron and elevators. I'm using a LiO pack with a 5.6 vdc regulator. I put these servos and battery in as I wanted to check them out before I put them in my new pattern plane. Originally I had Futaba 9001s on the elev & ailerons. What a difference the new servos and extra volts made. The plane is far more precise and a whole lot easier to hover. You can't beat power and accuracy!! I can also now do a wall with low rates as defined in the manual! The servos are that much faster.