Xpert RC WR-4401

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-26

Identity
Brand
Product Number	WR-4401
Category	Hobby
Performance
Torque	6.6V 281.13 oz-in 6.0V 255.58 oz-in 4.8V 204.46 oz-in Average
Speed	6.6V 0.08 sec/60° 6.0V 0.09 sec/60° 4.8V 0.11 sec/60° Above Average
Physical
Weight	2.48 ozBelow Average
Dimensions	L 1.575 in W 0.787 in H 1.488 in
Case Material	Aluminum / Plastic
Drivetrain
Motor Type	Brushless
Gears	Metal
Rotation/Support	Bushing
Control & Signal
Neutral Position	1520 µs
Refresh Rate	333 Hz
Control System	PWM
Electrical & Environment
Operating Voltage	4.8–6.6 V
Water Rating	IP67
Connectivity
Connector	DuPont
Origin
Country of Origin	USA

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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	Average Stronger than 55% of 1302 Standard servos at 4.8V
Speed	Above Average Faster than 78% of 1282 Standard servos at 4.8V
Weight	Below Average Lighter than 26% of 2482 Standard servos

Performance Analysis

Shaft Power	3.57–6.75 W
Power Density	3.660 W/in³ More power-dense than 39% of 32 Xpert RC servos
Torque Density	2.9084 oz-in/g Stronger than 42% of 25 Xpert RC servos
Torque-to-Volume Ratio	110.85 oz-in/in³ Denser torque than 54% of 27 Xpert RC servos
Speed-to-Weight	0.13420 (1/sec·g) Faster than 13% of 25 Xpert RC servos
Speed-Torque Trade-off	21.67 Better balanced than 77% of 27 Xpert RC servos
Torque Gain per Volt	20.83%/V 5th-highest torque gain per volt of 27 Xpert RC servos
Speed Gain per Volt	20.93%/V 5th-highest speed gain per volt of 27 Xpert RC servos
Voltage Range Width	1.8 V Wider voltage range than 19% of 32 Xpert RC servos