Graupner DES 281 BBMG

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-23

Identity
Brand
Product Number	7905
Category	Hobby
Performance
Torque	6.0V 27.78 oz-in 4.8V 25.00 oz-in Average
Speed	6.0V 0.15 sec/60° 4.8V 0.18 sec/60° Bottom 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
Gear Spline/Teeth	23 T
Rotation Mode	Positional
Rotation/Support	Single Bearing
Control & Signal
Modulation	Digital
Rotational Range	90°
Pulse Cycle	3 ms
Neutral Position	1500 µs
Refresh Rate	333 Hz
Control System	PWM
Programmable	Yes
Electrical & Environment
Operating Voltage	4.8–6 V
Idle Current	0.005 A
Connectivity
Connector	JR (Universal)

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Compatible Hardware

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*Based on known specs.

Class Comparison

Torque	Average Stronger than 43% of 349 Digital Micro servos at 4.8V
Speed	Bottom 10% Faster than 8% of 347 Digital Micro servos at 4.8V
Weight	Above Average Lighter than 71% of 597 Digital Micro servos

Performance Analysis

Shaft Power	0.26–0.34 W
Power Density	1.130 W/in³ More power-dense than 22% of 563 Digital Micro servos
Torque Density	2.9412 oz-in/g Stronger than 68% of 349 Digital Micro servos
Torque-to-Volume Ratio	82.48 oz-in/in³ Denser torque than 59% of 345 Digital Micro servos
Speed-to-Weight	0.65360 (1/sec·g) Faster than 40% of 347 Digital Micro servos
Speed-Torque Trade-off	4.50 Better balanced than 69% of 345 Digital Micro servos
Torque Gain per Volt	9.27%/V More voltage-responsive (torque) than 9% of 290 Digital Micro servos
Speed Gain per Volt	16.68%/V More voltage-responsive (speed) than 50% of 295 Digital Micro servos
Voltage Range Width	1.2 V Wider voltage range than 27% of 496 Digital Micro servos