This is the Futaba BLS172HV S-Bus Programmable Ultra-Torque Servo.

FEATURES: Ideal for large scale airplane control surfaces
          High voltage, may be used with 2S LiPo packs
          Case has metal middle section for efficient heat dissipation
          Water sealed
          Dual ball bearings
          One year limited warranty through Hobby Services beginning at date of
            purchase

INCLUDES: Futaba BLS172HV Servo with 0.83" (21mm) round Horn, 1.8" (45mm) round
            Horn, 1.5" (39mm) four point Horn, 1.2" (32mm) six point Horn and
            Mounting Hardware

SPECS:      7.4V                         6.6V
          Torque: 514 oz-in            472.2 oz-in
                  37.0 kgf-cm          34.0 kgf-cm
          Speed: 0.11 sec/60°          0.12 sec/60°
          Size: 1.6 x .8 x 1.5" (41 x 21 x 38mm)
          Weight: 2.61oz (74g)
          Power Supply: 6.0 - 7.4V DC

                                                                   jxs 12/22/11
                                                                         ir/jxs