Graupner/GM High Voltage Brushless Servos

High-Voltage Brushless Servo or HBS for short combines the performance of brushless technology with all the advantages of the high-voltage servo. In addition to the unparalleled acceleration, greater efficiency and no wear of carbon brushes, these servos can be supplied with an operating voltage up to 8.4V allowing them to be connected up directly to a two-cell LiPo battery pack. In addition, these servos also provide top performance at an operating voltage of just 6V. Precision manufacturing, assembly and top component quality provide the servo drive system with uncompromising power and speed. A new dimension in the combination of power, speed, acceleration, precision, and resolution. All three shown here feature double ball bearings, metal gears and high quality rubber seals.

GM7990   High-Voltage Brushless Servo HBS 860 BB MG – suitable for many applications but especially good for 4WD off-road
GM7991   High-Voltage Brushless Servo HBS 870 BB MG – suitable for many applications but especially good for 2WD off-road
GM7987   High-Voltage Brushless Servo HBS 790 BB MG – ideally suited for touring cars and small space applications

GM7990 HBS 860 BB MG
Holding Torque: 29.5kg/cm @ 7.4V
Speed: 0.11/40-degrees @ 6V
Operating Voltage: 4.8-8.4V
Dimensions: 40x20x40mm
Weight: 68g
Torque: 15.3kg/cm @ 7.4V

GM7991 HBS 870 BB MG
Holding Torque: 26.5kg/cm @ 7.4V
Speed: 0.09/40-degrees @ 6V
Operating Voltage: 4.8-8.4V
Dimensions: 40x20x40mm
Weight: 68g
Torque: 13.3kg/cm @ 7.4V

GM7987 HBS 790 BB MG
Holding Torque: 15.3kg/cm @ 7.4V
Speed: 0.055/40-degrees @ 6V
Operating Voltage: 4.8-8.4V
Dimensions: 40x20x26mm
Weight: 43g
Torque: 7.1kg/cm @ 7.4V

Source: Schumacher