Blue Bird BMS-663MG+HS

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-10-10

Identity
Brand
Product Number	BMS-663MG+HS
Category	Hobby
Performance
Torque	6.0V 88.90 oz-in 4.8V 73.62 oz-in Below Average
Speed	6.0V 0.08 sec/60° 4.8V 0.10 sec/60° Above 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
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 11% of 1043 Digital Standard servos at 4.8V
Speed	Above Average Faster than 75% of 1041 Digital Standard servos at 4.8V
Weight	Above Average Lighter than 84% of 1902 Digital Standard servos

Performance Analysis

Shaft Power	1.36–2.05 W
Power Density	1.095 W/in³ More power-dense than 20% of 1759 Digital Standard servos
Torque Density	1.4435 oz-in/g Stronger than 9% of 1036 Digital Standard servos
Torque-to-Volume Ratio	39.23 oz-in/in³ Denser torque than 8% of 1042 Digital Standard servos
Speed-to-Weight	0.19608 (1/sec·g) Faster than 85% of 1033 Digital Standard servos
Speed-Torque Trade-off	7.36 Better balanced than 9% of 1031 Digital Standard servos
Torque Gain per Volt	17.30%/V More voltage-responsive (torque) than 65% of 850 Digital Standard servos
Speed Gain per Volt	20.83%/V More voltage-responsive (speed) than 81% of 871 Digital Standard servos
Voltage Range Width	1.2 V Wider voltage range than 10% of 1539 Digital Standard servos