RJX Hobby FS0390HV

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Technical Specifications

Last Updated: 2026-10-26

Identity
Brand
Product Number	FS0390HV
Category	Hobby
Performance
Torque	8.4V 170.82 oz-in 7.4V 155.54 oz-in Top 10%
Speed	8.4V 0.05 sec/60° 7.4V 0.07 sec/60° Top 10%
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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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Torque	Top 10% Stronger than 94% of 290 Digital Mini servos at 7.4V
Speed	Top 10% Faster than 93% of 293 Digital Mini servos at 7.4V
Weight	Bottom 10% Lighter than 4% of 505 Digital Mini servos

Performance Analysis

Shaft Power	4.42–5.96 W
Power Density	5.736 W/in³ More power-dense than 89% of 482 Digital Mini servos
Torque Density	3.4564 oz-in/g Stronger than 82% of 286 Digital Mini servos
Torque-to-Volume Ratio	149.72 oz-in/in³ Denser torque than 87% of 288 Digital Mini servos
Speed-to-Weight	0.34188 (1/sec·g) Faster than 56% of 289 Digital Mini servos
Speed-Torque Trade-off	10.11 Better balanced than 69% of 288 Digital Mini servos
Torque Gain per Volt	9.82%/V More voltage-responsive (torque) than 9% of 257 Digital Mini servos
Speed Gain per Volt	22.64%/V More voltage-responsive (speed) than 84% of 262 Digital Mini servos
Voltage Range Width	1.0 V Wider voltage range than 1% of 405 Digital Mini servos