Graupner HCM 870 BBMG

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-10

Identity
Brand
Product Number	S4073
Category	Hobby
Performance
Torque	7.4V 354.17 oz-in 6.0V 291.67 oz-in 4.8V 229.16 oz-in Average
Speed	7.4V 0.10 sec/60° 6.0V 0.12 sec/60° 4.8V 0.15 sec/60° Average
Physical
Weight	2.54 ozBelow Average
Dimensions	L 1.57 in W 0.79 in H 1.59 in
Case Material	Metal
Drivetrain
Motor Type	Coreless
Gears	Metal
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Electrical & Environment
Operating Voltage	4.8–8.4 V
Connectivity
Connector	JR (Universal)

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Compatible Hardware

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*Based on known specs.

Class Comparison

Torque	Average Stronger than 52% of 1043 Digital Standard servos at 4.8V
Speed	Average Faster than 41% of 1041 Digital Standard servos at 4.8V
Weight	Below Average Lighter than 28% of 1902 Digital Standard servos

Performance Analysis

Shaft Power	2.82–6.55 W
Power Density	3.321 W/in³ More power-dense than 63% of 1759 Digital Standard servos
Torque Density	3.1828 oz-in/g Stronger than 45% of 1036 Digital Standard servos
Torque-to-Volume Ratio	116.20 oz-in/in³ Denser torque than 50% of 1042 Digital Standard servos
Speed-to-Weight	0.09259 (1/sec·g) Faster than 28% of 1033 Digital Standard servos
Speed-Torque Trade-off	34.37 Better balanced than 57% of 1031 Digital Standard servos
Voltage Range Width	3.6 V Wider voltage range than 86% of 1539 Digital Standard servos