Graupner HBS 870 BBMG

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-10

Identity
Brand
Product Number	7991
Category	Hobby
Performance
Torque	7.4V 180.56 oz-in 6.0V 152.78 oz-in 4.8V 118.06 oz-in Below Average
Speed	7.4V 0.11 sec/60° 6.0V 0.14 sec/60° 4.8V 0.16 sec/60° Below Average
Physical
Weight	2.47 ozBelow Average
Dimensions	L 1.575 in W 0.787 in H 1.591 in
Drivetrain
Motor Type	Brushless
Gears	Steel
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Rotational Range	90°
Pulse Cycle	2.5 ms
Pulse Width	1-16 µs
Neutral Position	1500 µs
Control System	PWM
Programmable	Yes
Electrical & Environment
Operating Voltage	4.8–8.4 V
Idle Current	0.047 A
Connectivity
Connector	JR (Universal)

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*Based on known specs.

Class Comparison

Torque	Below Average Stronger than 23% of 1043 Digital Standard servos at 4.8V
Speed	Below Average Faster than 33% of 1041 Digital Standard servos at 4.8V
Weight	Below Average Lighter than 34% of 1902 Digital Standard servos

Performance Analysis

Shaft Power	1.36–3.04 W
Power Density	1.539 W/in³ More power-dense than 33% of 1759 Digital Standard servos
Torque Density	1.6866 oz-in/g Stronger than 14% of 1036 Digital Standard servos
Torque-to-Volume Ratio	59.86 oz-in/in³ Denser torque than 20% of 1042 Digital Standard servos
Speed-to-Weight	0.08929 (1/sec·g) Faster than 23% of 1033 Digital Standard servos
Speed-Torque Trade-off	18.89 Better balanced than 34% of 1031 Digital Standard servos
Voltage Range Width	3.6 V Wider voltage range than 86% of 1539 Digital Standard servos