Graupner DES 291 BBMG

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-10

Identity
Brand
Product Number	7906
Category	Hobby
Discontinued	Yes
Performance
Torque	6.0V 13.89 oz-in 4.8V 11.11 oz-in Bottom 10%
Speed	6.0V 0.06 sec/60° 4.8V 0.07 sec/60° Top 10%
Physical
Weight	0.30 ozAbove Average
Dimensions	L 0.847 in W 0.433 in H 0.827 in
Drivetrain
Motor Type	Brushed
Gears	Steel
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Pulse Width	1-16 µs
Control System	PWM
Programmable	Yes
Electrical & Environment
Operating Voltage	4.8–6 V
Connectivity
Connector	JR (Universal)

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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Torque	Bottom 10% Stronger than 9% of 328 Digital Micro servos at 4.8V
Speed	Top 10% Faster than 91% of 328 Digital Micro servos at 4.8V
Weight	Above Average Lighter than 66% of 620 Digital Micro servos

Performance Analysis

Shaft Power	0.29–0.43 W
Power Density	1.412 W/in³ More power-dense than 36% of 590 Digital Micro servos
Torque Density	1.3071 oz-in/g Stronger than 5% of 327 Digital Micro servos
Torque-to-Volume Ratio	36.65 oz-in/in³ Denser torque than 9% of 327 Digital Micro servos
Speed-to-Weight	1.68067 (1/sec·g) Faster than 87% of 327 Digital Micro servos
Speed-Torque Trade-off	0.78 Better balanced than 5% of 327 Digital Micro servos
Torque Gain per Volt	20.85%/V More voltage-responsive (torque) than 73% of 268 Digital Micro servos
Speed Gain per Volt	13.89%/V More voltage-responsive (speed) than 28% of 273 Digital Micro servos
Voltage Range Width	1.2 V Wider voltage range than 26% of 511 Digital Micro servos