Graupner DES 291 BBMG

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-26

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 0.08 sec/60° 4.8V 0.10 sec/60° Above Average
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
Rotational Range	90°
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 10% of 363 Digital Micro servos at 4.8V
Speed	Above Average Faster than 70% of 361 Digital Micro servos at 4.8V
Weight	Above Average Lighter than 67% of 665 Digital Micro servos

Performance Analysis

Shaft Power	0.21–0.34 W
Power Density	1.130 W/in³ More power-dense than 24% of 625 Digital Micro servos
Torque Density	1.3071 oz-in/g Stronger than 6% of 363 Digital Micro servos
Torque-to-Volume Ratio	36.65 oz-in/in³ Denser torque than 10% of 359 Digital Micro servos
Speed-to-Weight	1.20664 (1/sec·g) Faster than 80% of 361 Digital Micro servos
Speed-Torque Trade-off	1.08 Better balanced than 9% of 358 Digital Micro servos
Torque Gain per Volt	20.85%/V More voltage-responsive (torque) than 71% of 302 Digital Micro servos
Speed Gain per Volt	25.00%/V More voltage-responsive (speed) than 81% of 305 Digital Micro servos
Voltage Range Width	1.2 V Wider voltage range than 25% of 553 Digital Micro servos