Flash Hobby BLS4037RP

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-10

Identity
Brand
Product Number	BLS4037RP
Category	Hobby
Performance
Torque	8.4V 514.00 oz-in 7.4V 430.00 oz-in 6.0V 361.00 oz-in
Speed	8.4V 0.07 sec/60° 7.4V 0.08 sec/60° 6.0V 0.10 sec/60°
Stall Current	0.8–0.9 ATop 10%
Physical
Weight	2.82 ozBottom 10%
Dimensions	L 1.59 in W 0.79 in H 1.57 in
Case Material	Nylon / Fiberglass
Drivetrain
Motor Type	Brushless
Gears	Steel
Gear Spline/Teeth	25 T
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Mechanical Limit	180°
Neutral Position	1520 µs
Dead Band	5 µs
Angle Sensor	Potentiometer
Control System	PWM
Programmable	Yes
Electrical & Environment
Operating Voltage	4.8–6 V
Temperature	-10–50 °C
Water Rating	Waterproof
Connectivity
Connector	JR (Universal)
Wire Length	250 mm
Origin
Country of Origin	China

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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

Weight	Bottom 10% Lighter than 9% of 1902 Digital Standard servos
Stall Current	Top 10% Lower draw than 98% of 539 Digital Standard servos

Performance Analysis

Shaft Power	6.67–13.58 W
Power Density	6.885 W/in³ More power-dense than 90% of 1759 Digital Standard servos
Torque Density	4.5125 oz-in/g
Torque-to-Volume Ratio	183.06 oz-in/in³
Speed-to-Weight	0.12500 (1/sec·g)
Speed-Torque Trade-off	36.10
Current-per-Torque Ratio	0.0025 A/oz-in
Voltage Range Width	1.2 V Wider voltage range than 8% of 1539 Digital Standard servos