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Technical Specifications
Last Updated: 2026-10-26
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | FS0391HV |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
147.20 oz-in
10.60 kg-cm
1.0 N-m
7.4V
133.30 oz-in
9.60 kg-cm
0.9 N-m
6.0V
116.70 oz-in
8.40 kg-cm
0.8 N-m
Below Average
|
| Speed |
8.4V
0.03 sec/60°
2,000.0 deg/s
333.3 RPM
7.4V
0.03 sec/60°
1,875.0 deg/s
312.5 RPM
6.0V
0.04 sec/60°
1,714.3 deg/s
285.7 RPM
Top 10%
|
| Physical | |
| Weight | 1.76 oz50.0 gAbove Average |
| Dimensions |
L 1.42 in W 0.59 in H 1.40 in L 36.1 mm W 15.0 mm H 35.6 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Metal |
| Control & Signal | |
| Modulation | Digital |
| Neutral Position | 1520 µs |
| Refresh Rate | 333 Hz |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Connectivity | |
| Connector | JR (Universal) estimate |
| Origin | |
| Country of Origin | China |
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.
Class Comparison
| Torque | Below Average Stronger than 22% of 1060 Digital Standard servos at 6.0V |
| Speed | Top 10% Faster than 100% of 1045 Digital Standard servos at 6.0V |
| Weight | Above Average Lighter than 86% of 1880 Digital Standard servos |
Performance Analysis
| Shaft Power | 6.17–9.07 W |
| Power Density | 7.735 W/in³ More power-dense than 93% of 1768 Digital Standard servos |
| Torque Density | 2.3340 oz-in/g Stronger than 28% of 1053 Digital Standard servos |
| Torque-to-Volume Ratio | 99.50 oz-in/in³ Denser torque than 43% of 1058 Digital Standard servos |
| Speed-to-Weight | 0.57143 (1/sec·g) Faster than 100% of 1038 Digital Standard servos |
| Speed-Torque Trade-off | 4.08 Better balanced than 5% of 1034 Digital Standard servos |
| Torque Gain per Volt | 10.89%/V More voltage-responsive (torque) than 22% of 873 Digital Standard servos |
| Speed Gain per Volt | 6.94%/V More voltage-responsive (speed) than 4% of 874 Digital Standard servos |
| Voltage Range Width | 2.4 V Wider voltage range than 48% of 1560 Digital Standard servos |
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