Servo Specs, Reviews, & Comparison Tool
Blue Bird BMS-820DMG+HS - Digital Hi Torque Servo
Specifications
| Last Updated: | 2025-08-04 |
| Modulation: | Digital |
| Torque: |
4.8V: 130.00 oz-in (9.36 kg-cm) 6.0V: 140.00 oz-in (10.08 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: | 3-pole |
| 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-820DMG+HS is a formidable, high-voltage (HV) digital servo that packs an incredible amount of torque into a compact, sub-micro case. While it is also very fast, its primary focus is on delivering raw, unadulterated power. It features a precise digital controller and a heavy-duty metal gear (MG) train designed to handle immense stress. The "+HS" indicates it is still a high-speed servo, but within its family, it is the one chosen for strength. Its HV capability allows it to produce a level of torque that is truly astonishing for its size. This makes it a premier choice for the cyclic controls on aggressively flown 500-class 3D helicopters, or as an unbelievably powerful aileron servo for a large, fast EDF jet or a giant-scale glider with large flaps.
- The defining characteristic of the BMS-820DMG+HS is its astonishing strength. It has the muscle to move large, heavily-loaded control surfaces with ease, providing a solid, unyielding feel that is free from blowback. This gives pilots a huge amount of confidence, knowing that their commands will be executed with absolute authority, no matter the flight speed or G-loading. The robust metal gear train is essential for handling the massive power generated by the HV motor.
- In robotics, the BMS-820DMG+HS is a powerhouse. Its incredible torque-to-weight ratio makes it ideal for building small but incredibly strong robots. It would be an outstanding choice for the primary lifting joints of a compact robotic arm designed to handle heavy payloads. It's also perfect for the leg joints of a dynamic walking robot that needs to jump or carry heavy equipment. When a compact robotics project requires an almost absurd amount of torque, the BMS-820DMG+HS is the solution.
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