Blue Bird BMS-397HT

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Technical Specifications

Last Updated: 2026-10-10

Identity
Brand
Product Number	BBR-BMS-397HT
Category	Hobby
Performance
Torque	8.4V 81.95 oz-in 7.4V 70.84 oz-in 6.0V 55.56 oz-in
Speed	8.4V 0.05 sec/60° 7.4V 0.06 sec/60° 6.0V 0.07 sec/60°
Physical
Weight	0.76 ozAbove Average
Dimensions	L 1.142 in W 0.512 in H 1.181 in
Case Material	Aluminum
Drivetrain
Motor Type	Coreless
Gears	Metal
Gear Spline/Teeth	25 T
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Rotational Range	90°
Pulse Cycle	3 ms
Pulse Width	1500-1900 µs
Neutral Position	1500 µs
Dead Band	1 µs
Refresh Rate	333 Hz
Control System	PWM
Electrical & Environment
Operating Voltage	4.5–8.5 V
Connectivity
Connector	JR (Universal) estimate
Wire Length	150 mm
Origin
Country of Origin	Taiwan

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*Based on known specs.

Class Comparison

Weight

Above Average

Lighter than 66% of 466 Digital Mini servos

Performance Analysis

Shaft Power	1.47–3.03 W
Power Density	4.389 W/in³ More power-dense than 83% of 440 Digital Mini servos
Torque Density	2.5842 oz-in/g
Torque-to-Volume Ratio	80.46 oz-in/in³
Speed-to-Weight	0.66445 (1/sec·g)
Speed-Torque Trade-off	3.89
Voltage Range Width	4.0 V Wider voltage range than 92% of 351 Digital Mini servos
Dead-Band-to-Pulse-Width Ratio	0.0025 Finer dead band than 14% of 77 Digital Mini servos