GM/Graupner推出高压无刷舵机，支持8.4V 2cell锂电，三种不同版本适合4wd越野，2wd越野和平路房车使用 。
GM7990 High Voltage Brushless Servo HBS 860 BB MG
Suitable for many applications but especially good for 4WD Off Road.
Features:
- Brushless
- Digital
- High Voltage upto 8.4v
- Twin Ball Bearing
- Metal Gears
- High quality rubber seals
Specifications:
Holding Torque – 29.5 kg/cm @ 7.4v
Speed – 0.11/40deg @6v
Operating voltage – 4.8 – 8.4v
Dimensions (LxWxH): 40 x 20 x 40 mm
Weight – 68g
Torque – 15.3 kg/cm @7.4v 
M7991 High Voltage Brushless Servo HBS 870 BB MG
Suitable for many applications but especially good for 2WD Off Road
Features:
- Brushless
- Digital
- High Voltage upto 8.4v
- Twin Ball Bearing
- Metal Gears
- High quality rubber seals
Specifications:
Holding Torque – 26.5 kg/cm @ 7.4v
Speed – 0.09/40deg @6v
Operating voltage – 4.8 – 8.4v
Dimensions (LxWxH): 40 x 20 x 40 mm
Weight – 68g
Torque – 13.3 kg/cm @7.4v
GM7987 Hi Voltage Brushless Servo HBS 790 BB, MG
Ideally suited for Touring Cars and small space applications.
Features:
- Brushless
- Digital
- High Voltage upto 8.4v
- Twin Ball Bearing
- Metal Gears
- High quality rubber seals
Specifications:
Holding Torque – 15.3 kg/cm @ 7.4v
Speed – 0.055/40deg @6v
Operating voltage – 4.8 – 8.4v
Dimensions (LxWxH): 40 x 19,5 x 25,5 mm
Weight – 43g
Torque – 7.1 kg/cm @7.4v
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