RJX Hobby FS0390HV

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Technical Specifications

Last Updated: 2026-10-10

Identity
Brand
Product Number	FS0390HV
Category	Hobby
Performance
Torque	7.4V 102.79 oz-in Above Average 6.0V 83.34 oz-in 5.0V 69.45 oz-in
Speed	7.4V 0.04 sec/60° Top 10% 6.0V 0.05 sec/60° 5.0V 0.06 sec/60°
Physical
Weight	1.59 ozBottom 10%
Dimensions	L 1.42 in W 0.59 in H 1.24 in
Drivetrain
Motor Type	Coreless
Gears	Metal
Control & Signal
Modulation	Digital
Neutral Position	1520 µs
Refresh Rate	333 Hz
Electrical & Environment
Operating Voltage	7.4–8.4 V
Connectivity
Connector	JR (Universal) estimate
Origin
Country of Origin	China

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*Based on known specs.

Class Comparison

Torque	Above Average Stronger than 77% of 262 Digital Mini servos at 7.4V
Speed	Top 10% Faster than 100% of 263 Digital Mini servos at 7.4V
Weight	Bottom 10% Lighter than 5% of 466 Digital Mini servos

Performance Analysis

Shaft Power	2.14–4.75 W
Power Density	4.574 W/in³ More power-dense than 83% of 440 Digital Mini servos
Torque Density	2.2842 oz-in/g Stronger than 45% of 258 Digital Mini servos
Torque-to-Volume Ratio	98.94 oz-in/in³ Denser torque than 69% of 262 Digital Mini servos
Speed-to-Weight	0.55556 (1/sec·g) Faster than 86% of 259 Digital Mini servos
Speed-Torque Trade-off	4.11 Better balanced than 22% of 261 Digital Mini servos
Voltage Range Width	1.0 V Wider voltage range than 1% of 351 Digital Mini servos