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Technical Specifications
Last Updated: 2026-09-13
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | FUTM0521 |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
4.8V53.00 oz-in3.82 kg-cm0.4 N-mBottom 10% |
| Speed |
4.8V0.06 sec/60°1,000.0 deg/s166.7 RPMTop 10% |
| Physical | |
| Weight | 2.10 oz59.5 gAverage |
| Dimensions |
L 1.57 in W 0.79 in H 1.45 in L 39.9 mm W 20.1 mm H 36.8 mm |
| Case Material | Plastic / Aluminum |
| Drivetrain | |
| Motor Type | Brushless |
| Gears | Metal |
| Gear Spline/Teeth | 21 T estimate |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Neutral Position | 760 µs |
| Refresh Rate | 560 Hz |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Connectivity | |
| Connector | JR (Universal) |
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 | Bottom 10% Stronger than 4% of 1043 Digital Standard servos at 4.8V |
| Speed | Top 10% Faster than 95% of 1041 Digital Standard servos at 4.8V |
| Weight | Average Lighter than 63% of 1902 Digital Standard servos |
Performance Analysis
| Shaft Power | 1.63 W |
| Power Density | 0.908 W/in³ More power-dense than 15% of 1759 Digital Standard servos |
| Torque Density | 0.8908 oz-in/g Stronger than 1% of 1036 Digital Standard servos |
| Torque-to-Volume Ratio | 29.47 oz-in/in³ Denser torque than 4% of 1042 Digital Standard servos |
| Speed-to-Weight | 0.28011 (1/sec·g) Faster than 93% of 1033 Digital Standard servos |
| Speed-Torque Trade-off | 3.18 Better balanced than 3% of 1031 Digital Standard servos |
| Voltage Range Width | 1.2 V Wider voltage range than 23% of 1539 Digital Standard servos |
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Reviews (2)
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silcom69
September 23, 2023Application(s): Tail rotor 700 heli - TDR Henseleit
Comments: Robust, precise and reliable.
Logos1
June 20, 2012Application(s): Tailrotor 600heli (Mikado Logo)
Comments: An outstanding servo! Sollid as a rock!