Futaba BLS251SB

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-22

Identity
Brand
Product Number	01102283-1
Category	Hobby
Discontinued	Yes
Performance
Torque	6.0V 66.55 oz-in 4.8V 52.78 oz-in Bottom 10%
Speed	6.0V 0.05 sec/60° 4.8V 0.06 sec/60° Top 10%
Physical
Weight	2.12 ozAverage
Dimensions	L 1.575 in W 0.787 in H 1.449 in
Case Material	Aluminum
Drivetrain
Motor Type	Brushless
Gears	Metal
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Rotational Range	180°
Neutral Position	760 µs
Control System	SBUS2
Programmable	Yes
Electrical & Environment
Operating Voltage	4.8–6 V
Power Source	DC
Temperature	-15–55 °C
Connectivity
Connector	Futaba J

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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

*Based on known specs.

Class Comparison

Torque	Bottom 10% Stronger than 4% of 1055 Digital Standard servos at 4.8V
Speed	Top 10% Faster than 95% of 1038 Digital Standard servos at 4.8V
Weight	Average Lighter than 62% of 1872 Digital Standard servos

Performance Analysis

Shaft Power	1.63–2.43 W
Power Density	1.351 W/in³ More power-dense than 27% of 1762 Digital Standard servos
Torque Density	0.8797 oz-in/g Stronger than 1% of 1048 Digital Standard servos
Torque-to-Volume Ratio	29.39 oz-in/in³ Denser torque than 3% of 1053 Digital Standard servos
Speed-to-Weight	0.27778 (1/sec·g) Faster than 94% of 1031 Digital Standard servos
Speed-Torque Trade-off	3.17 Better balanced than 3% of 1029 Digital Standard servos
Torque Gain per Volt	21.74%/V More voltage-responsive (torque) than 88% of 868 Digital Standard servos
Speed Gain per Volt	15.28%/V More voltage-responsive (speed) than 49% of 868 Digital Standard servos
Voltage Range Width	1.2 V Wider voltage range than 15% of 1552 Digital Standard servos