Servo Specs, Reviews, & Comparison Tool
Blue Bird BMS-821DMG+HS - Digital Hi Speed Servo
Specifications
| Last Updated: | 2025-08-04 |
| Modulation: | Digital |
| Torque: |
4.8V: 82.00 oz-in (5.90 kg-cm) 6.0V: 112.00 oz-in (8.06 kg-cm) |
| Speed: |
4.8V: 0.11 sec/60° 6.0V: 0.09 sec/60° |
| Weight: | 1.59 oz (45.1 g) |
| Dimensions: |
Length:1.60 in (40.6 mm) Width:0.79 in (20.1 mm) Height:1.46 in (37.1 mm) |
| Motor Type: | (add) |
| Gear Type: | Metal |
| Rotation/Support: | Dual Bearings |
| Rotational Range: | (add) |
| Pulse Cycle: | (add) |
| Pulse Width: | (add) |
| Connector Type: | (add) |
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Notes
- The discontinued Blue Bird BMS-821DMG+HS is a state-of-the-art, high-voltage (HV) digital brushless servo in a compact, sub-micro package. This servo represents the absolute zenith of technology in its size class, combining a long-life brushless motor, a precision digital controller, a durable metal gear (MG) train, and high-speed (+HS) tuning. It is designed for pilots and builders who want the best possible performance and longevity in a small form factor. It is an ideal, no-compromise choice for the cyclic and tail controls on a top-tier 450 or 500-class helicopter, or for the flight controls on any high-performance aircraft where reliability and consistency are paramount.
- The brushless motor is the star of the show, offering a significant leap in efficiency, power, and lifespan over conventional motors. It runs cooler, responds faster, and will not lose performance over time due to brush wear. This means the servo will perform like new for years, even under the most demanding conditions. The HV digital platform provides the immense power and precision to match, and the metal gears ensure it is all delivered through a durable, reliable geartrain. It is an investment in long-term, top-tier performance.
- For advanced robotics, particularly in aerospace and mobile robotics, the BMS-821DMG+HS is a dream component. The brushless motor's longevity is perfect for actuators on drones, rovers, or any system that must operate for long missions with high reliability. The high power density (power-to-weight ratio) is critical for building lightweight, high-performance systems. It's an ideal actuator for the flight control surfaces on a professional UAV or for the joints of a sophisticated, battery-powered robotic manipulator.
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