Graupner HBS 690 BB

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-10

Identity
Brand
Product Number	7981
Category	Hobby
Discontinued	Yes
Performance
Torque	7.4V 83.33 oz-in 6.0V 69.44 oz-in 4.8V 55.56 oz-in Bottom 10%
Speed	7.4V 0.08 sec/60° 6.0V 0.10 sec/60° 4.8V 0.12 sec/60° Average
Physical
Weight	1.13 ozTop 10%
Dimensions	L 1.378 in W 0.63 in H 1.378 in
Drivetrain
Motor Type	Brushless
Gears	Karbonite
Rotation Mode	Positional
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Rotational Range	90°
Control System	PWM
Programmable	Yes
Electrical & Environment
Operating Voltage	4.8–8.4 V
Idle Current	0.037 A
Connectivity
Connector	JR (Universal)

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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Torque	Bottom 10% Stronger than 5% of 1043 Digital Standard servos at 4.8V
Speed	Average Faster than 64% of 1041 Digital Standard servos at 4.8V
Weight	Top 10% Lighter than 98% of 1902 Digital Standard servos

Performance Analysis

Shaft Power	0.86–1.93 W
Power Density	1.610 W/in³ More power-dense than 35% of 1759 Digital Standard servos
Torque Density	1.7363 oz-in/g Stronger than 16% of 1036 Digital Standard servos
Torque-to-Volume Ratio	46.45 oz-in/in³ Denser torque than 12% of 1042 Digital Standard servos
Speed-to-Weight	0.26042 (1/sec·g) Faster than 92% of 1033 Digital Standard servos
Speed-Torque Trade-off	6.67 Better balanced than 8% of 1031 Digital Standard servos
Voltage Range Width	3.6 V Wider voltage range than 86% of 1539 Digital Standard servos