Blue Arrow MI-W21L-4212-SG

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*Based on known specs.

Technical Specifications

Last Updated: 2026-07-10

Identity
Brand
Category	Hobby
Performance
Torque	7.4V 583.38 oz-in 6.0V 527.82 oz-in
Speed	7.4V 0.13 sec/60° 6.0V 0.15 sec/60°
Stall Current	2.7–3.5 AAverage
Physical
Weight	2.96 ozBottom 10%
Dimensions	L 1.59 in W 0.83 in H 1.48 in
Case Material	Aluminum
Drivetrain
Motor Type	Coreless
Gears	Steel
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Direction	Clockwise
Rotational Range	60°
Mechanical Limit	120°
Pulse Width	900-2100 µs
Neutral Position	1500 µs
Dead Band	2 µs
Refresh Rate	333 Hz
Angle Sensor	Potentiometer
Control System	PWM
Electrical & Environment
Operating Voltage	3.5–8.5 V
Temperature	-20–70 °C
Connectivity
Connector	JR (Universal)
Wire Length	300 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 5% of 1880 Digital Standard servos
Stall Current	Average Lower draw than 44% of 570 Digital Standard servos

Performance Analysis

Shaft Power	6.51–8.30 W
Power Density	4.248 W/in³ More power-dense than 73% of 1768 Digital Standard servos
Torque Density	6.2836 oz-in/g
Torque-to-Volume Ratio	270.24 oz-in/in³
Speed-to-Weight	0.07937 (1/sec·g)
Speed-Torque Trade-off	79.17
Current-per-Torque Ratio	0.0066 A/oz-in
Voltage Range Width	5.0 V Wider voltage range than 97% of 1560 Digital Standard servos
Dead-Band-to-Pulse-Width Ratio	0.0017 Finer dead band than 44% of 504 Digital Standard servos