Servo Specs, Reviews, & Comparison Tool
Blue Bird BMS-631 - Super Fast Standard Servo
Specifications
| Last Updated: | 2025-08-04 |
| Modulation: | Analog |
| Torque: |
4.8V: 69.00 oz-in (4.97 kg-cm) 6.0V: 86.00 oz-in (6.19 kg-cm) |
| Speed: |
4.8V: 0.10 sec/60° 6.0V: 0.08 sec/60° |
| Weight: | 1.80 oz (51.0 g) |
| Dimensions: |
Length:1.60 in (40.6 mm) Width:0.80 in (20.3 mm) Height:1.50 in (38.1 mm) |
| Motor Type: | (add) |
| Gear Type: | Metal |
| Rotation/Support: | Dual Bearings |
| Rotational Range: | (add) |
| Pulse Cycle: | (add) |
| Pulse Width: | (add) |
| Connector Type: | S |
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Notes
- The discontinued Blue Bird BMS-631 is a high-performance standard-sized servo that stands out due to its exceptionally fast transit speed, achieved through the use of a high-quality coreless motor and dual ball bearings. This servo prioritizes velocity and precision above all else, making it a specialized tool for competitive applications. It is the premier choice for tail rotor control on large 600/700 class helicopters, where its incredible speed allows the gyro to make near-instantaneous corrections, resulting in a perfectly locked-in tail, even during the most violent 3D maneuvers. It is also an excellent choice for the rudder on a large 3D or pattern aircraft to achieve breathtakingly fast yaw rates and pinpoint-accurate stall turns.
- The essence of the BMS-631 is its refined, blistering speed. The coreless motor provides an immediate response with no hesitation, while the dual ball bearings ensure that this speed is delivered with slop-free precision. This gives pilots a feeling of being perfectly synchronized with their machine, allowing them to fly with a level of accuracy and aggression that is not possible with slower servos. It is a competition-grade component designed to provide a tangible performance edge when fractions of a second and perfect control matter.
- In the field of robotics, the BMS-631’s specialized performance can be harnessed for tasks that demand extreme speed and precision. It would be an outstanding choice for a vision-guided robotic arm in a high-speed picking or sorting application. It could also be used in scientific research for creating high-frequency oscillations or for actuating control surfaces on a high-speed experimental vehicle. It’s the actuator to choose when a robotic project's main limitation is the speed and responsiveness of its moving parts.
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