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Technical Specifications
Last Updated: 2026-09-13| Identity | |
| Brand |  |
| Product Number | 31081S |
| Category | Hobby |
| Performance | |
| Torque |
6.0V
42.00 oz-in
3.02 kg-cm
0.3 N-m
4.8V
36.00 oz-in
2.59 kg-cm
0.3 N-m
Average
|
| Speed |
6.0V
0.09 sec/60°
666.7 deg/s
111.1 RPM
4.8V
0.11 sec/60°
545.5 deg/s
90.9 RPM
Above Average
|
| Running Current |
6.0V
0.280 A
280 mA
4.8V
0.220 A
220 mA
Average
|
| Stall Current | ≤1.5 A≤1500 mABelow Average |
| Physical | |
| Weight | 0.59 oz16.6 gAbove Average |
| Dimensions |
L 1.17 in W 0.47 in H 1.16 in L 29.7 mm W 11.9 mm H 29.5 mm |
| Case Material | Plastic |
| Drivetrain | |
| Motor Type | 3-pole |
| Gears | Nylon |
| Gear Spline/Teeth | 15 T estimate |
| Rotation Mode | Positional |
| Rotation/Support | Bushing |
| Control & Signal | |
| Modulation | Analog |
| Direction | Clockwise |
| Rotational Range | 80° |
| Mechanical Limit | 165° |
| Pulse Cycle | 20 ms |
| Pulse Width | 900-2100 µs |
| Neutral Position | 1500 µs |
| Dead Band | 8 µs |
| Refresh Rate | 50 Hz |
| Angle Sensor | Potentiometer |
| Control System | PWM |
| Programmable | No |
| Signal Voltage | 3-5V |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Power Source | Direct |
| Regulator Type | Direct |
| Temperature | -20–60 °C-4–140 °F |
| Water Rating | Not Rated |
| Idle Current | 0.009 A9 mA |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 160 mm6.3 in |
| Origin | |
| Country of Origin | Philippines |
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 | Average Stronger than 51% of 80 Analog Mini servos at 4.8V |
| Speed | Above Average Faster than 84% of 81 Analog Mini servos at 4.8V |
| Weight | Above Average Lighter than 71% of 165 Analog Mini servos |
| Running Current | Average Lower draw than 41% of 42 Mini servos at 4.8V |
| Stall Current | Below Average Lower draw than 27% of 23 Analog Mini servos |
Performance Analysis
| Shaft Power | 0.61–0.86 W |
| Power Density | 1.353 W/in³ More power-dense than 86% of 163 Analog Mini servos |
| Torque Density | 2.1687 oz-in/g Stronger than 70% of 80 Analog Mini servos |
| Torque-to-Volume Ratio | 56.44 oz-in/in³ Denser torque than 63% of 80 Analog Mini servos |
| Speed-to-Weight | 0.54765 (1/sec·g) Faster than 79% of 81 Analog Mini servos |
| Speed-Torque Trade-off | 3.96 Better balanced than 28% of 80 Analog Mini servos |
| Current-per-Torque Ratio | 0.0417 A/oz-in More efficient than 16% of 83 Hitec servos |
| Idle-to-Running Current Ratio | 0.041 Lower idle draw than 47% of 54 Hitec servos |
| No-Load vs Stall Current Spread | 6.82 Narrower current spread than 48% of 49 Hitec servos |
| Torque Gain per Volt | 13.89%/V More voltage-responsive (torque) than 44% of 55 Analog Mini servos |
| Speed Gain per Volt | 18.52%/V More voltage-responsive (speed) than 75% of 56 Analog Mini servos |
| Voltage Range Width | 1.2 V Wider voltage range than 76% of 88 Analog Mini servos |
| Dead-Band-to-Pulse-Width Ratio | 0.0067 Finer dead band than 4% of 118 Hitec servos |
Notes
This servo comes in a metal gear version that has been discontinued, HS-81MG.
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Reviews (4)
-
wally
June 17, 2016Application(s): 1500mm warbird
Comments: These are cheap so i guess you get what you pay for. The gears strip easily. Had a crash and both ailerin servos striped.
Trick Wings, Zagi
February 4, 2014Application(s): The HS-80 and later the HS-81 has been used for elevon servos in the Zagi THL and all of the electric flying wings for 15 years.
Comments: The way we rate servos is by service, availability and price. The HS-81 rates high for our mixed elevon application. Very few returns or user issues. It's a reliable servo.
Gary Parker
January 13, 2012Application(s): Mid-size power planes and gliders
Comments: I have been disappointed by these servos. Sure, they are cheap, but they develop slop, and they strip easily. Hitec HS-85MGs are the same size but are far stronger and better. But then again, 85s cost around twice as much.
RocketGuy
November 7, 2009Application(s): Elevon control, CombatWings MiniXE (100mph 34"flying wing)
Comments: A solid well modulated servo. Quick, precise, and crash resistant. Very impressive for a micro servo. I frequently had roll rates exceeding 600deg/sec and yet was able to instinctively enter level flight at will.