Xpert RC SI-4401-HV

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-10

Identity
Brand
Product Number	SI-4401-HV
Category	Hobby
Performance
Torque	8.4V 261.13 oz-in 7.4V 230.02 oz-in 6.0V 186.54 oz-in Average
Speed	8.4V 0.08 sec/60° 7.4V 0.09 sec/60° 6.0V 0.11 sec/60° Above Average
Physical
Weight	2.20 ozAverage
Dimensions	L 1.575 in W 0.787 in H 1.488 in
Case Material	Aluminum
Drivetrain
Motor Type	Brushless
Gears	Aluminum
Gear Spline/Teeth	25 T
Rotation/Support	Dual Bearings
Control & Signal
Neutral Position	1520 µs
Refresh Rate	333 Hz
Control System	PWM
Electrical & Environment
Operating Voltage	6–8.4 V
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 50% of 1294 Standard servos at 6.0V
Speed	Above Average Faster than 71% of 1290 Standard servos at 6.0V
Weight	Average Lighter than 41% of 2538 Standard servos

Performance Analysis

Shaft Power	3.11–6.11 W
Power Density	3.314 W/in³ More power-dense than 29% of 32 Xpert RC servos
Torque Density	2.9846 oz-in/g Stronger than 46% of 25 Xpert RC servos
Torque-to-Volume Ratio	101.14 oz-in/in³ Denser torque than 31% of 27 Xpert RC servos
Speed-to-Weight	0.14414 (1/sec·g) Faster than 17% of 25 Xpert RC servos
Speed-Torque Trade-off	20.71 Better balanced than 73% of 27 Xpert RC servos
Torque Gain per Volt	16.66%/V More voltage-responsive (torque) than 27% of 27 Xpert RC servos
Speed Gain per Volt	16.88%/V More voltage-responsive (speed) than 62% of 27 Xpert RC servos
Voltage Range Width	2.4 V Wider voltage range than 81% of 32 Xpert RC servos