Xpert RC SI-4431

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Technical Specifications

Last Updated: 2026-10-10

Identity
Brand
Product Number	SI-4431
Category	Hobby
Performance
Torque	6.6V 267.38 oz-in 6.0V 243.08 oz-in 4.8V 194.46 oz-in Average
Speed	6.6V 0.07 sec/60° 6.0V 0.08 sec/60° 4.8V 0.10 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	Metal
Control & Signal
Modulation	Digital
Neutral Position	1520 µs
Refresh Rate	333 Hz
Control System	PWM
Electrical & Environment
Operating Voltage	4.8–6.6 V
Origin
Country of Origin	USA

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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Torque	Average Stronger than 44% of 1043 Digital Standard servos at 4.8V
Speed	Above Average Faster than 75% of 1041 Digital Standard servos at 4.8V
Weight	Average Lighter than 50% of 1902 Digital Standard servos

Performance Analysis

Shaft Power	3.60–7.06 W
Power Density	3.829 W/in³ More power-dense than 69% of 1759 Digital Standard servos
Torque Density	3.1114 oz-in/g Stronger than 44% of 1036 Digital Standard servos
Torque-to-Volume Ratio	105.43 oz-in/in³ Denser torque than 44% of 1042 Digital Standard servos
Speed-to-Weight	0.16000 (1/sec·g) Faster than 76% of 1033 Digital Standard servos
Speed-Torque Trade-off	19.45 Better balanced than 35% of 1031 Digital Standard servos
Torque Gain per Volt	20.83%/V More voltage-responsive (torque) than 83% of 850 Digital Standard servos
Speed Gain per Volt	23.81%/V More voltage-responsive (speed) than 92% of 871 Digital Standard servos
Voltage Range Width	1.8 V Wider voltage range than 39% of 1539 Digital Standard servos