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Technical Specifications
Last Updated: 2026-10-24
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | BLS3813A |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
597.20 oz-in
43.00 kg-cm
4.2 N-m
7.4V
527.70 oz-in
38.00 kg-cm
3.7 N-m
6.0V
416.60 oz-in
30.00 kg-cm
2.9 N-m
Above Average
|
| Speed |
8.4V
0.12 sec/60°
500.0 deg/s
83.3 RPM
7.4V
0.13 sec/60°
461.5 deg/s
76.9 RPM
6.0V
0.15 sec/60°
400.0 deg/s
66.7 RPM
Average
|
| Physical | |
| Weight | 54.72 oz1,551.3 gBottom 10% |
| Dimensions |
L 1.594 in W 0.787 in H 1.496 in L 40.5 mm W 20.0 mm H 38.0 mm |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Metal |
| Gear Spline/Teeth | 25 T |
| Control & Signal | |
| Modulation | Digital |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Temperature | -20–55 °C-4–131 °F |
| Connectivity | |
| Connector | JR (Universal) estimate |
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 | Above Average Stronger than 86% of 1060 Digital Standard servos at 6.0V |
| Speed | Average Faster than 38% of 1045 Digital Standard servos at 6.0V |
| Weight | Bottom 10% Lighter than 0% of 1880 Digital Standard servos |
Performance Analysis
| Shaft Power | 5.14–9.20 W |
| Power Density | 4.903 W/in³ More power-dense than 79% of 1768 Digital Standard servos |
| Torque Density | 0.2685 oz-in/g Stronger than 0% of 1053 Digital Standard servos |
| Torque-to-Volume Ratio | 221.99 oz-in/in³ Denser torque than 88% of 1058 Digital Standard servos |
| Speed-to-Weight | 0.00430 (1/sec·g) Faster than 0% of 1038 Digital Standard servos |
| Speed-Torque Trade-off | 62.49 Better balanced than 86% of 1034 Digital Standard servos |
| Torque Gain per Volt | 18.06%/V More voltage-responsive (torque) than 70% of 873 Digital Standard servos |
| Speed Gain per Volt | 10.42%/V More voltage-responsive (speed) than 19% of 874 Digital Standard servos |
| Voltage Range Width | 2.4 V Wider voltage range than 44% of 1560 Digital Standard servos |
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Reviews (8)
Includes 8 reviews aggregated from around the web.
There are few reviews for this servo on the web. A retailer shows eight reviews, all five stars. Owners use it in jets, EDF models and a large Extra, and describe it as powerful, smooth, quiet and locked in, with no buzzing, a standard fit in servo hatches and an aluminum arm included.
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