Graupner HBS 790 BBMG

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Technical Specifications

Last Updated: 2026-10-10

Identity
Brand
Product Number	7987
Category	Hobby
Performance
Torque	7.4V 97.22 oz-in 6.0V 84.72 oz-in 4.8V 62.50 oz-in Bottom 10%
Speed	7.4V 0.07 sec/60° 6.0V 0.08 sec/60° 4.8V 0.10 sec/60° Average
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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*Based on known specs.

Class Comparison

Torque	Bottom 10% Stronger than 9% of 136 Digital Low Profile servos at 4.8V
Speed	Average Faster than 47% of 135 Digital Low Profile servos at 4.8V
Weight	Above Average Lighter than 84% of 251 Digital Low Profile servos

Performance Analysis

Shaft Power	1.16–2.57 W
Power Density	2.116 W/in³ More power-dense than 36% of 215 Digital Low Profile servos
Torque Density	1.4535 oz-in/g Stronger than 8% of 136 Digital Low Profile servos
Torque-to-Volume Ratio	51.50 oz-in/in³ Denser torque than 10% of 136 Digital Low Profile servos
Speed-to-Weight	0.23256 (1/sec·g) Faster than 63% of 135 Digital Low Profile servos
Speed-Torque Trade-off	6.25 Better balanced than 10% of 134 Digital Low Profile servos
Voltage Range Width	3.6 V Wider voltage range than 85% of 223 Digital Low Profile servos