Graupner HCM 488 BBMG

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-26

Identity
Brand
Product Number	S4078
Category	Hobby
Performance
Torque	7.4V 51.39 oz-in 6.0V 43.06 oz-in 4.8V 34.72 oz-in Above Average
Speed	7.4V 0.05 sec/60° 6.0V 0.06 sec/60° 4.8V 0.07 sec/60° Top 10%
Physical
Weight	0.81 ozBottom 10%
Dimensions	L 0.91 in W 0.47 in H 1.12 in
Case Material	Aluminum
Drivetrain
Motor Type	Coreless
Gears	Metal
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Electrical & Environment
Operating Voltage	4.8–8.4 V
Power Source	2S LiPo
Connectivity
Connector	JR (Universal)

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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Torque	Above Average Stronger than 66% of 349 Digital Micro servos at 4.8V
Speed	Top 10% Faster than 93% of 347 Digital Micro servos at 4.8V
Weight	Bottom 10% Lighter than 5% of 597 Digital Micro servos

Performance Analysis

Shaft Power	0.92–1.90 W
Power Density	3.967 W/in³ More power-dense than 70% of 563 Digital Micro servos
Torque Density	1.5096 oz-in/g Stronger than 8% of 349 Digital Micro servos
Torque-to-Volume Ratio	72.48 oz-in/in³ Denser torque than 50% of 345 Digital Micro servos
Speed-to-Weight	0.62112 (1/sec·g) Faster than 37% of 347 Digital Micro servos
Speed-Torque Trade-off	2.43 Better balanced than 34% of 345 Digital Micro servos
Voltage Range Width	3.6 V Wider voltage range than 90% of 496 Digital Micro servos