Futaba BLS251SB

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-08

Identity
Brand
Product Number	01102283-1
Category	Hobby
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	Metal
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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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Torque	Bottom 10% Stronger than 4% of 1043 Digital Standard servos at 4.8V
Speed	Top 10% Faster than 94% of 1041 Digital Standard servos at 4.8V
Weight	Average Lighter than 61% of 1902 Digital Standard servos

Performance Analysis

Shaft Power	1.63–2.43 W
Power Density	1.351 W/in³ More power-dense than 27% of 1759 Digital Standard servos
Torque Density	0.8797 oz-in/g Stronger than 1% of 1036 Digital Standard servos
Torque-to-Volume Ratio	29.39 oz-in/in³ Denser torque than 3% of 1042 Digital Standard servos
Speed-to-Weight	0.27778 (1/sec·g) Faster than 93% of 1033 Digital Standard servos
Speed-Torque Trade-off	3.17 Better balanced than 3% of 1031 Digital Standard servos
Torque Gain per Volt	21.74%/V More voltage-responsive (torque) than 89% of 850 Digital Standard servos
Speed Gain per Volt	15.28%/V More voltage-responsive (speed) than 49% of 871 Digital Standard servos
Voltage Range Width	1.2 V Wider voltage range than 15% of 1539 Digital Standard servos