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Technical Specifications
Last Updated: 2026-10-24
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | TS-THS921A |
| Category | Hobby |
| Performance | |
| Torque |
8.4V
119.40 oz-in
8.60 kg-cm
0.8 N-m
7.4V
108.30 oz-in
7.80 kg-cm
0.8 N-m
6.0V
91.70 oz-in
6.60 kg-cm
0.6 N-m
Top 10%
|
| Speed |
8.4V
0.09 sec/60°
666.7 deg/s
111.1 RPM
7.4V
0.10 sec/60°
600.0 deg/s
100.0 RPM
6.0V
0.12 sec/60°
500.0 deg/s
83.3 RPM
Average
|
| Stall Current | ≤1.7 A≤1700 mABelow Average |
| Physical | |
| Weight | 0.74 oz21.0 gBottom 10% |
| Dimensions |
L 0.91 in W 0.47 in H 1.08 in L 23.1 mm W 11.9 mm H 27.4 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Metal |
| Gear Spline/Teeth | 25 T |
| Shaft Size | 4.90 mm |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Pulse Width | 500-2500 µs |
| Neutral Position | 1520 µs |
| Refresh Rate | 400 Hz |
| Angle Sensor | Magnetic Encoder |
| Control System | PWM |
| Programmable | No |
| Electrical & Environment | |
| Operating Voltage | 6–8.4 V |
| Power Source | 2S LiPo |
| Connectivity | |
| Connector | JR (Universal) estimate |
| Wire Length | 190 mm7.48 in |
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 | Top 10% Stronger than 92% of 349 Digital Micro servos at 6.0V |
| Speed | Average Faster than 36% of 347 Digital Micro servos at 6.0V |
| Weight | Bottom 10% Lighter than 8% of 597 Digital Micro servos |
| Stall Current | Below Average Lower draw than 22% of 188 Digital Micro servos |
Performance Analysis
| Shaft Power | 1.41–2.45 W |
| Power Density | 5.310 W/in³ More power-dense than 81% of 563 Digital Micro servos |
| Torque Density | 4.3667 oz-in/g Stronger than 89% of 349 Digital Micro servos |
| Torque-to-Volume Ratio | 198.52 oz-in/in³ Denser torque than 92% of 345 Digital Micro servos |
| Speed-to-Weight | 0.39683 (1/sec·g) Faster than 9% of 347 Digital Micro servos |
| Speed-Torque Trade-off | 11.00 Better balanced than 91% of 345 Digital Micro servos |
| Current-per-Torque Ratio | 0.0185 A/oz-in More efficient than 94% of 98 Digital Micro servos |
| Torque Gain per Volt | 12.59%/V More voltage-responsive (torque) than 22% of 290 Digital Micro servos |
| Speed Gain per Volt | 13.89%/V More voltage-responsive (speed) than 23% of 295 Digital Micro servos |
| Voltage Range Width | 2.4 V Wider voltage range than 55% of 496 Digital Micro servos |
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Reviews (10)
Includes 10 reviews aggregated from around the web.
Buyers rate this servo well: 89% of nine reviews on a helicopter retailer's listing are five stars and the rest four. Owners call it fast, dependable, very reliable and good at centering, and use it in 3D foam planes and as an engine throttle servo. Complaints are that it is expensive, the included horns are flimsy and can snap in a hard landing, and the programming box is frustrating to use.
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