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Technical Specifications
Last Updated: 2026-10-09
Weight
Dimensions
Torque
Speed
Current
Temp
Wire
| Identity | |
| Brand |  |
| Product Number | 8520 |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
4.8V12.50 oz-in0.90 kg-cm0.1 N-mBelow Average |
| Speed |
4.8V0.07 sec/60°857.1 deg/s142.9 RPMTop 10% |
| Physical | |
| Weight | 0.35 oz9.8 gAverage |
| Dimensions |
L 0.91 in W 0.45 in H 0.95 in L 23.1 mm W 11.4 mm H 24.1 mm |
| Drivetrain | |
| Gears | Carbon |
| Gear Spline/Teeth | 25 T estimate |
| Rotation/Support | Single Bearing |
| Control & Signal | |
| Modulation | Digital |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–5.1 V |
| Connectivity | |
| Connector | JR (Universal) estimate |
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 12% of 328 Digital Micro servos at 4.8V |
| Speed | Top 10% Faster than 92% of 328 Digital Micro servos at 4.8V |
| Weight | Average Lighter than 53% of 620 Digital Micro servos |
Performance Analysis
| Shaft Power | 0.33 W |
| Power Density | 0.849 W/in³ More power-dense than 11% of 590 Digital Micro servos |
| Torque Density | 1.2716 oz-in/g Stronger than 4% of 327 Digital Micro servos |
| Torque-to-Volume Ratio | 32.13 oz-in/in³ Denser torque than 7% of 327 Digital Micro servos |
| Speed-to-Weight | 1.45328 (1/sec·g) Faster than 83% of 327 Digital Micro servos |
| Speed-Torque Trade-off | 0.88 Better balanced than 7% of 327 Digital Micro servos |
| Voltage Range Width | 0.3 V Wider voltage range than 2% of 511 Digital Micro servos |
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Reviews (1)
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chopstick
January 17, 2010Application(s): this servo workes fine on my 450-size heli and a Spartan DS760-gyro.all with anSpektrum DX7 TX and AR6110 RX
Comments: Specially designd for 450-sized helicopters