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Technical Specifications
Last Updated: 2026-07-10Identity
Performance
Physical
Drivetrain
Control & Signal
Electrical & Environment
Connectivity
Origin
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| Identity | |
| Brand |  |
| Product Number | WK-0902H |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
4.8V27.77 oz-in2.00 kg-cm0.2 N-m |
| Speed |
4.8V0.08 sec/60°750.0 deg/s125.0 RPM |
| Running Current | (add) |
| Stall Current | (add) |
| Physical | |
| Weight | 0.29 oz8.2 g |
| Dimensions |
L 0.88 in W 0.47 in H 1.04 in L 22.4 mm W 11.9 mm H 26.5 mm |
| Case Material | (add) |
| Drivetrain | |
| Motor Type | (add) |
| Motor Drive | (add) |
| Gears | (add) |
| Gear Spline/Teeth | (add) |
| Shaft Size | (add) |
| Rotation Mode | (add) |
| Rotation/Support | (add) |
| Backlash | (add) |
| Control & Signal | |
| Modulation | Digital |
| Direction | (add) |
| Rotational Range | (add) |
| Mechanical Limit | (add) |
| Pulse Cycle | (add) |
| Pulse Width | (add) |
| Neutral Position | (add) |
| Dead Band | (add) |
| Refresh Rate | (add) |
| Angle Sensor | (add) |
| Control System | (add) |
| Programmable | (add) |
| Signal Voltage | (add) |
| Electrical & Environment | |
| Operating Voltage | (add) |
| Power Source | (add) |
| Regulator Type | (add) |
| Temperature | (add) |
| Water Rating | (add) |
| Certification | (add) |
| Idle Current | (add) |
| Connectivity | |
| Connector | (add) |
| Wire Length | (add) |
| Origin | |
| Country of Origin | (add) |
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.
Performance Analysis
| Shaft Power | 0.64 W |
| Torque Density | 3.3866 oz-in/g |
| Torque-to-Volume Ratio | 64.37 oz-in/in³ |
| Power Density | 1.488 W/in³ More power-dense than 40% of the 545 Digital Micro servos in the database |
| Speed-to-Weight | 1.52439 (1/sec·g) |
| Speed-Torque Trade-off | 2.22 |
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Reviews (2)
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betibeau
May 20, 2013Application(s): uflys, esky V3,V4, Commanch etc....
Comments: Only 2, mainly due to price and quality. HKSCM9-6 or HKscm9-5 are excellent, faster and cheaper. Do not get be fooled by the Walkera brand name. B rgds - thb
flyinfosheezy
July 30, 2012Application(s): Tail rotor servo for 250 size electric heli.
Comments: After only 2 easy flights the tail servo started wagging on 3rd flight. Each subsequent flight attempt the tail servo twitched erratically then locked in full deflection without any input from transmitter. Servo got very warm and then failed. Total life of the tail servo was less than 30 minutes. I would not recommend as a replacement servo.