Blue Bird BMS-590SG

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Technical Specifications

Last Updated: 2026-10-10

Identity
Brand
Product Number	BBR-BMS-590SG
Category	Hobby
Performance
Torque	8.4V 879.24 oz-in 7.4V 775.06 oz-in 6.0V 634.77 oz-in
Speed	8.4V 0.14 sec/60° 7.4V 0.16 sec/60° 6.0V 0.19 sec/60°
Physical
Weight	5.89 ozAbove Average
Dimensions	L 2.35 in W 1.165 in H 2.15 in
Case Material	Aluminum / Plastic
Drivetrain
Motor Type	Coreless
Gears	Metal
Gear Spline/Teeth	15 T
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Neutral Position	1500 µs
Dead Band	2 µs
Refresh Rate	333 Hz
Control System	PWM
Electrical & Environment
Operating Voltage	4.5–8.7 V
Power Source	2S Li-Po / 2S Li-Fe
Temperature	75–85 °C
Connectivity
Connector	JR (Universal) estimate
Wire Length	300 mm
Origin
Country of Origin	Taiwan

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*Based on known specs.

Class Comparison

Weight

Above Average

Lighter than 73% of 174 Digital Giant servos

Performance Analysis

Shaft Power	6.18–11.61 W
Power Density	1.973 W/in³ More power-dense than 61% of 132 Digital Giant servos
Torque Density	3.8010 oz-in/g
Torque-to-Volume Ratio	107.84 oz-in/in³
Speed-to-Weight	0.03152 (1/sec·g)
Speed-Torque Trade-off	120.60
Voltage Range Width	4.2 V Wider voltage range than 58% of 160 Digital Giant servos