Graupner HBM 690 BBMG

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-26

Identity
Brand
Product Number	S4071
Category	Hobby
Performance
Torque	7.4V 83.32 oz-in 6.0V 69.44 oz-in 4.8V 41.66 oz-in Below Average
Speed	7.4V 0.06 sec/60° 6.0V 0.10 sec/60° 4.8V 0.12 sec/60° Average
Physical
Weight	1.52 ozBottom 10%
Dimensions	L 1.378 in W 0.63 in H 1.358 in
Case Material	Metal
Drivetrain
Motor Type	Brushless
Gears	Steel
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Control System	PWM
Programmable	Yes
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	Below Average Stronger than 28% of 284 Digital Mini servos at 4.8V
Speed	Average Faster than 48% of 288 Digital Mini servos at 4.8V
Weight	Bottom 10% Lighter than 7% of 490 Digital Mini servos

Performance Analysis

Shaft Power	0.64–2.57 W
Power Density	2.178 W/in³ More power-dense than 60% of 468 Digital Mini servos
Torque Density	0.9688 oz-in/g Stronger than 1% of 280 Digital Mini servos
Torque-to-Volume Ratio	35.33 oz-in/in³ Denser torque than 9% of 282 Digital Mini servos
Speed-to-Weight	0.19380 (1/sec·g) Faster than 10% of 284 Digital Mini servos
Speed-Torque Trade-off	5.00 Better balanced than 35% of 282 Digital Mini servos
Voltage Range Width	3.6 V Wider voltage range than 87% of 396 Digital Mini servos