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Technical Specifications
Last Updated: 2026-10-24
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | 7990 |
| Category | Hobby |
| Performance | |
| Torque |
7.4V
208.33 oz-in
15.00 kg-cm
1.5 N-m
6.0V
183.33 oz-in
13.20 kg-cm
1.3 N-m
4.8V
138.89 oz-in
10.00 kg-cm
1.0 N-m
Below Average
|
| Speed |
7.4V
0.14 sec/60°
444.4 deg/s
74.1 RPM
6.0V
0.17 sec/60°
363.6 deg/s
60.6 RPM
|
| Physical | |
| Weight | 2.40 oz68.0 gAverage |
| Dimensions |
L 1.575 in W 0.787 in H 1.575 in L 40.0 mm W 20.0 mm H 40.0 mm |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Steel |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 90° |
| Pulse Cycle | 2.5 ms |
| Neutral Position | 1500 µs |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–8.4 V |
| Idle Current | 0.046 A46 mA |
| Connectivity | |
| Connector | JR (Universal) |
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 28% of 1055 Digital Standard servos at 4.8V |
| Weight | Average Lighter than 38% of 1872 Digital Standard servos |
Performance Analysis
| Shaft Power | 2.05–2.85 W |
| Power Density | 1.461 W/in³ More power-dense than 30% of 1762 Digital Standard servos |
| Torque Density | 2.0425 oz-in/g Stronger than 23% of 1048 Digital Standard servos |
| Torque-to-Volume Ratio | 71.13 oz-in/in³ Denser torque than 26% of 1053 Digital Standard servos |
| Speed-to-Weight | 0.08913 (1/sec·g) |
| Speed-Torque Trade-off | 22.92 |
| Voltage Range Width | 3.6 V Wider voltage range than 85% of 1552 Digital Standard servos |
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Reviews (1)
Includes 1 review aggregated from around the web.
There are very few reviews for this servo on the web. A German forum member reports that three of them did not function properly when he set up his rudder.
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