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Blue Bird BMS-308BB - Micro Servo
Specifications
| Last Updated: | 2025-08-04 |
| Modulation: | Analog |
| Torque: |
4.8V: 17.00 oz-in (1.22 kg-cm) |
| Speed: |
4.8V: 0.10 sec/60° |
| Weight: | 0.22 oz (6.2 g) |
| Dimensions: |
Length:0.94 in (23.9 mm) Width:0.40 in (10.2 mm) Height:0.90 in (22.9 mm) |
| Motor Type: | (add) |
| Gear Type: | (add) |
| Rotation/Support: | Single Bearing |
| Rotational Range: | (add) |
| Pulse Cycle: | (add) |
| Pulse Width: | (add) |
| Connector Type: | (add) |
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Notes
- The discontinued Blue Bird BMS-308BB is a high-quality analog micro servo that stands out by offering premium features in a compact and lightweight package. It is designed for pilots of small to medium-sized park flyers, electric sailplanes, and hand-launch gliders who are looking for a step up in precision and durability from entry-level servos. Its two most significant features are its robust carbonite-and-metal hybrid gear train and, crucially, its dual ball bearing (BB) supported output shaft. The combination of a strong gear material and two points of low-friction support makes this servo exceptionally precise and resistant to developing slop over its lifetime. This is a level of construction quality not always found in servos of this size.
- The primary advantage of the BMS-308BB is its smooth, slop-free operation and excellent centering. The dual ball bearings provide a very rigid support for the output shaft, eliminating play and allowing the servo to return to its exact center position with unerring accuracy. This is particularly noticeable in flight, where it gives the aircraft a very precise, "locked-in" feel. Pilots who fly precision aerobatics or who rely on subtle control inputs for thermal soaring highly value this level of accuracy. It's a servo that provides a tangible improvement in the quality of flight control.
- For robotics engineers and hobbyists, the BMS-308BB is an excellent choice for applications that require both precision and long-term reliability. The dual ball bearings make it ideal for actuators that are under a constant side-load, such as the drive wheel on a small robot or a joint in a robotic arm that has to support a cantilevered load. The slop-free nature ensures accurate and repeatable movements, making it perfect for building precise camera gimbals, sensor platforms, or any mechanism where positional accuracy is paramount.
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