BLS471SV Brushless13.8kg/0.07@7.4v (car) HV

This is the Futaba BLS471SV High Voltage Programmable Car Servo.

Brushless motor
Futaba S.BUS2 system can be connected to a PC using the CIU-2 USB
adapter PC Interface (not included sold separately, FUTM0951) to
change various operating characteristics
 

Futaba BLS471SV Servo with Wire Lead, Connector, 1.7" (44mm) T-shaped
Horn, two Rubber Dampers, four Eyelets, 3x8mm Horn Mounting Screw
and Instruction Sheet

                                           6.0V                                   7.4V
Speed:                         0.09 @ 60°                      0.07 @ 60°
Torque:          158.4 oz/in (11.4 kg/cm)   191.7 oz/in (13.8 kg/cm)
Rated Voltage: 6.0- 7.4V DC
Operating Voltage: 4.0 - 8.4V DC
Dimensions: 1.57 x 0.79 x 1.45" (40 x 20 x 36.8mm)
Weight: 2.01oz (57g)

For full performance, a 2.4GHz surface radio system is recommended.
This servo cannot be used with an air radio system.