Graupner HBS 790 BBMG

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-24

Identity
Brand
Product Number	7987
Category	Hobby
Performance
Torque	7.4V 99.13 oz-in 6.0V 86.38 oz-in
Speed	7.4V 0.07 sec/60° 6.0V 0.08 sec/60°
Physical
Weight	1.52 ozAbove Average
Dimensions	L 1.575 in W 0.768 in H 1.004 in
Drivetrain
Motor Type	Brushless
Gears	Steel
Rotation Mode	Positional
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Rotational Range	90°
Pulse Cycle	2.5 ms
Neutral Position	1500 µs
Refresh Rate	400 Hz
Control System	PWM
Electrical & Environment
Operating Voltage	4.8–8.4 V
Power Source	2S LiPo
Idle Current	0.031 A
Connectivity
Connector	JR (Universal)

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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Weight

Above Average

Lighter than 87% of 304 Digital Low Profile servos

Performance Analysis

Shaft Power	1.94–2.72 W
Power Density	2.237 W/in³ More power-dense than 30% of 273 Digital Low Profile servos
Torque Density	2.0088 oz-in/g
Torque-to-Volume Ratio	71.17 oz-in/in³
Speed-to-Weight	0.28189 (1/sec·g)
Speed-Torque Trade-off	7.13
Voltage Range Width	3.6 V Wider voltage range than 89% of 276 Digital Low Profile servos