Futaba HPS-HT700 - Brushless Helicopter Tail Rudder Servo Specs: Opertaing Voltage: 4.8-8.4V Rated Voltage: 6-7.4V Speed @ 6.6V: 0.05s/60° Torque @ 6.6V: 8.6kg/cm Speed @ 7.4V: 0.045s/60° Torque @ 7.4V: 9.6kg/cm Size: 40.5 x 21 x 26.2mm Weight: 56g