Servo Specs, Reviews, & Comparison Tool
Blue Bird BMS-371 - Micro Servo
Specifications
| Last Updated: | 2025-08-04 |
| Modulation: | Analog |
| Torque: |
4.8V: 21.00 oz-in (1.51 kg-cm) |
| Speed: |
4.8V: 0.12 sec/60° |
| Weight: | 0.33 oz (9.4 g) |
| Dimensions: |
Length:0.95 in (24.1 mm) Width:0.43 in (10.9 mm) Height:0.95 in (24.1 mm) |
| Motor Type: | (add) |
| Gear Type: | (add) |
| Rotation/Support: | (add) |
| Rotational Range: | (add) |
| Pulse Cycle: | (add) |
| Pulse Width: | (add) |
| Connector Type: | (add) |
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Notes
- The discontinued Blue Bird BMS-371 is a versatile and widely trusted sub-micro analog servo, occupying the popular 9-gram weight class. It has established itself as a reliable workhorse for a vast range of RC applications, making it a go-to choice for hobbyists building park flyers, small electric sport aircraft, and for the cyclic controls on entry-level 450-class helicopters. The BMS-371 is engineered to be a dependable, all-around performer, offering a good balance of speed, power, and precision without being overly specialized. It uses a durable nylon gear train and a simple, cost-effective bushing on the output shaft, a combination that has proven to be more than adequate for a huge number of general flying duties.
- The enduring appeal of the BMS-371 lies in its excellent value and its reputation for "just working." It is a straightforward, no-nonsense servo that delivers predictable performance flight after flight. For modelers who are building on a budget or who simply need a reliable component for a non-critical application, the BMS-371 is an outstanding choice. Its smooth operation and consistent centering make it easy to set up and provide a pleasant flight experience for sport and scale pilots. Its popularity means it is well-understood and trusted by the modeling community.
- In the context of robotics and education, the BMS-371 is a fundamental building block. Its adherence to the standard 9-gram form factor, its low cost, and its reliable performance make it an ideal choice for prototyping, student projects, and large-scale workshops. It is powerful enough for basic robotic arms, steering systems on small rovers, and a multitude of other simple actuation tasks. It is one of the quintessential servos for learning the basics of robotics and mechatronics.
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