Servo Specs, Reviews, & Comparison Tool
Blue Bird BMS-373 - Small Servo
Specifications
| Last Updated: | 2025-08-04 |
| Modulation: | Analog |
| Torque: |
4.8V: 22.00 oz-in (1.58 kg-cm) |
| Speed: |
4.8V: 0.12 sec/60° |
| Weight: | 0.32 oz (9.1 g) |
| Dimensions: |
Length:0.97 in (24.6 mm) Width:0.45 in (11.4 mm) Height:0.91 in (23.1 mm) |
| Motor Type: | (add) |
| Gear Type: | Plastic |
| Rotation/Support: | Bushing |
| Rotational Range: | (add) |
| Pulse Cycle: | (add) |
| Pulse Width: | (add) |
| Connector Type: | (add) |
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Notes
- The discontinued Blue Bird BMS-373 is a highly capable analog servo in the 9-gram class, known for its emphasis on speed and its use of a high-quality coreless motor. This servo is aimed squarely at pilots who want to extract the maximum performance from their small aircraft, particularly in applications where a rapid response is key. It is an excellent choice for the tail rotor on a 450-class helicopter, where its speed allows it to work effectively with the gyro to maintain a rock-solid heading. It is also a popular option for the ailerons on fast-moving park jets or 3D planes to achieve a crisp, high roll rate. The coreless motor is the key to its performance, offering faster acceleration and a smoother, more immediate response than traditional cored motors.
- The defining feature of the BMS-373 is its agility. Pilots who use this servo often describe their models as feeling more alive and connected. The lack of "cogging" from the coreless motor provides a very direct, high-fidelity feel that translates stick movements into control surface deflections with virtually no lag. This allows for more precise control during aggressive maneuvers and gives the pilot the confidence to fly closer to the edge. It's a significant performance upgrade that provides a tangible benefit in flight.
- For roboticists, the BMS-373’s coreless motor technology offers distinct advantages. The high speed and rapid direction-changing ability are perfect for building high-frequency mechanisms, such as a vibrating platform for sorting small parts or the actuator for a high-speed optical shutter. In competitive robotics, its speed could be used to create lightning-fast manipulators or defensive systems. It's a specialized tool for when a robotic project's performance is limited by the reaction time of its actuators.
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