Blue Bird BMS-621DMG+HS

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-10-09

Identity
Brand
Category	Hobby
Performance
Torque	6.0V 100.01 oz-in 4.8V 88.90 oz-in Below Average
Speed	6.0V 0.10 sec/60° 4.8V 0.13 sec/60° Average
Physical
Weight	1.80 ozAbove Average
Dimensions	L 1.594 in W 0.787 in H 1.496 in
Drivetrain
Gears	Metal
Gear Spline/Teeth	25 T estimate
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Control System	Digital Controller
Electrical & Environment
Operating Voltage	4.8–6 V
Connectivity
Connector	JR (Universal) estimate
Origin
Country of Origin	Taiwan

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Disclaimer: Most data is sourced from the manufacturer. Some data is sourced from our loyal community and with the help of AI. We aim for accuracy but are not responsible for inaccurate information.

Compatible Hardware

Amazon eBay

*Spec is estimated from brand data.

Class Comparison

Torque	Below Average Stronger than 15% of 1042 Digital Standard servos at 4.8V
Speed	Average Faster than 54% of 1038 Digital Standard servos at 4.8V
Weight	Above Average Lighter than 84% of 1902 Digital Standard servos

Performance Analysis

Shaft Power	1.26–1.85 W
Power Density	0.985 W/in³ More power-dense than 17% of 1760 Digital Standard servos
Torque Density	1.7431 oz-in/g Stronger than 16% of 1036 Digital Standard servos
Torque-to-Volume Ratio	47.37 oz-in/in³ Denser torque than 13% of 1041 Digital Standard servos
Speed-to-Weight	0.15083 (1/sec·g) Faster than 71% of 1031 Digital Standard servos
Speed-Torque Trade-off	11.56 Better balanced than 16% of 1028 Digital Standard servos
Torque Gain per Volt	10.41%/V More voltage-responsive (torque) than 20% of 847 Digital Standard servos
Speed Gain per Volt	25.01%/V More voltage-responsive (speed) than 94% of 865 Digital Standard servos
Voltage Range Width	1.2 V Wider voltage range than 10% of 1546 Digital Standard servos