Graupner HCM 870 BBMG HV Digital Servo ( S4073 )

Old Price: $139.90

Special Price: $53.76

Part Number: GR-S4073

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Graupner servos are equipped with all-metal parts and designed for maximum durability and extreme operations, the Graupner HCM 870 BBMG High Torque High-Voltage Coreless Digital Servo provides reliable high speed and great torque under extreme conditions with consistent control input performance. Optimized for high voltage input (8.4v), the HCM servos are specially designed to provide speed and holding power with low dead-band technology for extra reliability and precision while the aluminum case allows for lower operating temperatures and better run times. Fully programmable to meet your unique specifications via the free Graupner Servo Setup Software, the HBM 870 BBMG is ideal for large scale 3D airplanes and as a swashplate and tail servo for large 700-800 size helicopters.


  • Powerful Coreless motor
  • Full aluminum body
  • High Voltage 8.4V support
  • Five times more durable and 30% faster response times than brushed servos
  • Programmable digital circuit and SMT circuitry
  • 2048 high resolution
  • Supporting 1-16µ depending on programming
  • Wide frame rate range of 20Hz-400Hz
  • 12-bit processing circuit (At least twice resolution comparing to 10-bit processing circuit)

Included with the package:

  • Graupner HCM 870 BBMG HV Digital Servo x 1
  • Horn set


  • Category High Voltage
  • Type: Full metal body, Digital
  • Motor: Coreless
  • Speed:
    • 4.8V: 0.15 Sec/60
    • 6.0V: 0.12 Sec/60
    • 7.4V: 0.10 Sec/60
  • Torque:
    • 4.8V: 229.16
    • 6.0V: 291.67
    • 7.4V: 354.17
  • Gear: 1+3Metal
  • Bearing: 2BB
  • Heat sink: Full metal Body
  • Connector type: JR
  • Size: 1.57 x 0.79 x 1.59 in
  • Weight: 72g / 2.54 oz
  • Horn size: Ø 6 (25T)