Servo Specs, Reviews, & Comparison Tool
Blue Bird BMS-306BB - Micro Servo
Specifications
| Last Updated: | 2025-08-04 |
| Modulation: | Analog |
| Torque: |
4.8V: 15.00 oz-in (1.08 kg-cm) |
| Speed: |
4.8V: 0.10 sec/60° |
| Weight: | 0.23 oz (6.5 g) |
| Dimensions: |
Length:0.86 in (21.8 mm) Width:0.40 in (10.2 mm) Height:0.87 in (22.1 mm) |
| Motor Type: | Brushed |
| Gear Type: | Plastic |
| Rotation/Support: | Single Bearing |
| Rotational Range: | (add) |
| Pulse Cycle: | (add) |
| Pulse Width: | (add) |
| Connector Type: | Universal |
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Notes
- The discontinued Blue Bird BMS-306BB is a significant and worthwhile upgrade to the standard BMS-306 micro servo, incorporating a feature that dramatically enhances its precision and lifespan: a ball bearing (BB) on the output shaft. While it shares the same powerful motor and tough carbonite gear train as its sibling, the addition of the ball bearing elevates its performance to a new level. It is aimed at more discerning pilots of park flyers and small gliders who value precision and longevity. The ball bearing replaces the standard bushing, drastically reducing friction as the servo arm rotates. This leads to smoother operation, better centering accuracy, and a significant reduction in the development of "slop" or play in the geartrain over time.
- The primary benefit of the BMS-306BB is its improved precision under load. On a control surface like an aileron or elevator, aerodynamic forces create a side-load on the servo's output shaft. A simple bushing can allow for tiny movements under these loads, leading to a vague or imprecise feel. The ball bearing supports the shaft much more rigidly, ensuring that the servo's output remains true and accurate. This results in a more connected feel for the pilot and a more precise flight path for the aircraft. It’s a premium feature that provides a tangible improvement in flight quality.
- For roboticists, the ball bearing is a critical feature for any application where positional accuracy is important. It is an excellent choice for a small pan-and-tilt mechanism for a camera or sensor, as the ball bearing helps to eliminate jitter and ensure a stable image. It's also ideal for the joints of a small robotic arm, where precision is needed to accurately position the end-effector. The enhanced durability also makes it a wise choice for any robotic mechanism that will be in continuous, long-term operation.
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