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Technical Specifications
Last Updated: 2026-10-24| Identity | |
| Brand |  |
| Product Number | SM-S4209M |
| Category | Hobby |
| Performance | |
| Torque |
6.0V
133.60 oz-in
9.62 kg-cm
0.9 N-m
4.8V
121.00 oz-in
8.71 kg-cm
0.9 N-m
Below Average
|
| Speed |
6.0V
0.11 sec/60°
545.5 deg/s
90.9 RPM
4.8V
0.13 sec/60°
461.5 deg/s
76.9 RPM
Average
|
| Physical | |
| Weight | 2.19 oz62.0 gAverage |
| Dimensions |
L 1.654 in W 0.807 in H 1.555 in L 42.0 mm W 20.5 mm H 39.5 mm |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Copper |
| Rotation Mode | Positional |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Rotational Range | 180° |
| Neutral Position | 1500 µs |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Connectivity | |
| Connector | JR (Universal) |
| Origin | |
| Country of Origin | China |
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 23% of 1055 Digital Standard servos at 4.8V |
| Speed | Average Faster than 59% of 1038 Digital Standard servos at 4.8V |
| Weight | Average Lighter than 55% of 1872 Digital Standard servos |
Performance Analysis
| Shaft Power | 1.72–2.25 W |
| Power Density | 1.082 W/in³ More power-dense than 20% of 1762 Digital Standard servos |
| Torque Density | 1.9516 oz-in/g Stronger than 21% of 1048 Digital Standard servos |
| Torque-to-Volume Ratio | 58.30 oz-in/in³ Denser torque than 19% of 1053 Digital Standard servos |
| Speed-to-Weight | 0.12407 (1/sec·g) Faster than 58% of 1031 Digital Standard servos |
| Speed-Torque Trade-off | 15.73 Better balanced than 26% of 1029 Digital Standard servos |
| Torque Gain per Volt | 8.68%/V More voltage-responsive (torque) than 13% of 868 Digital Standard servos |
| Speed Gain per Volt | 15.17%/V More voltage-responsive (speed) than 48% of 868 Digital Standard servos |
| Voltage Range Width | 1.2 V Wider voltage range than 18% of 1552 Digital Standard servos |
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Reviews (2)
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finflyer
April 17, 2012Application(s): .50 size nitro helicopter ccpm servos!
Comments: One of three servos does not work at all!!
Cheap but crap servo!george
February 20, 2011Application(s): intended to use on Top Flite P-51 Mustang rudder, elevator,ailerons, and flaps, but 4 of the servos did not work !!!
Comments: I bought 6 of the servos from VOCANLO in Hong Cong for $102.00. 4 of the six dont work at all and the other two work part-time. The 4 that don't work,,the motor runs constantly when given a command, but the out-put shaft don't turn at all. Can you tell me the problem, and what is my recourse??????