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Technical Specifications
Last Updated: 2026-10-26
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | 7981 |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
7.4V
83.33 oz-in
6.00 kg-cm
0.6 N-m
6.0V
69.44 oz-in
5.00 kg-cm
0.5 N-m
4.8V
55.56 oz-in
4.00 kg-cm
0.4 N-m
Bottom 10%
|
| Speed |
7.4V
0.08 sec/60°
750.0 deg/s
125.0 RPM
6.0V
0.10 sec/60°
600.0 deg/s
100.0 RPM
4.8V
0.12 sec/60°
500.0 deg/s
83.3 RPM
Above Average
|
| Physical | |
| Weight | 1.13 oz32.0 gTop 10% |
| Dimensions |
L 1.378 in W 0.63 in H 1.378 in L 35.0 mm W 16.0 mm H 35.0 mm |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Karbonite |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 90° |
| Control System | PWM |
| Programmable | Yes |
| Electrical & Environment | |
| Operating Voltage | 4.8–8.4 V |
| Idle Current | 0.037 A37 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 | Bottom 10% Stronger than 5% of 1055 Digital Standard servos at 4.8V |
| Speed | Above Average Faster than 66% of 1038 Digital Standard servos at 4.8V |
| Weight | Top 10% Lighter than 98% of 1872 Digital Standard servos |
Performance Analysis
| Shaft Power | 0.86–1.93 W |
| Power Density | 1.610 W/in³ More power-dense than 35% of 1762 Digital Standard servos |
| Torque Density | 1.7363 oz-in/g Stronger than 16% of 1048 Digital Standard servos |
| Torque-to-Volume Ratio | 46.45 oz-in/in³ Denser torque than 13% of 1053 Digital Standard servos |
| Speed-to-Weight | 0.26042 (1/sec·g) Faster than 93% of 1031 Digital Standard servos |
| Speed-Torque Trade-off | 6.67 Better balanced than 7% of 1029 Digital Standard servos |
| 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. Two helicopter pilots who use it as a tail servo report no problems, one after 180 flights in a 500-size helicopter and another in two smaller helicopters, noting it has no more play than other servos.
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