Servo Specs, Reviews, & Comparison Tool
Blue Bird BMS-620 - Hi Torque Standard Servo
Specifications
| Last Updated: | 2025-08-04 |
| Modulation: | Analog |
| Torque: |
4.8V: 126.40 oz-in (9.10 kg-cm) 6.0V: 144.00 oz-in (10.37 kg-cm) |
| Speed: |
4.8V: 0.15 sec/60° 6.0V: 0.13 sec/60° |
| Weight: | 1.59 oz (45.1 g) |
| Dimensions: |
Length:1.60 in (40.6 mm) Width:0.79 in (20.1 mm) Height:1.65 in (41.9 mm) |
| Motor Type: | (add) |
| Gear Type: | Plastic |
| 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-620 is a classic, standard-sized analog servo that has long been a favorite among sport flyers and builders on a budget. It is a straightforward, reliable actuator designed for .40 to .60 size glow-powered trainers and sport planes, as well as large electric models. The BMS-620 uses a strong, durable nylon gear train and a bushing-supported output shaft, a combination that provides a very cost-effective way to equip a larger model with the control authority it needs. While it lacks the high-tech features of more expensive servos, it delivers solid, dependable performance for general-purpose flying.
- The greatest strength of the BMS-620 is its incredible value. It provides a substantial amount of power in a standard package at a very accessible price point. For a hobbyist building their first .40-size trainer, or for a sport pilot who needs to outfit a new "fun fly" model, the BMS-620 is an excellent choice. It allows them to get their plane in the air with reliable controls without a major financial investment. It has a long-standing reputation for being a tough and reliable servo that simply gets the job done.
- For robotics hobbyists and students building larger projects, the BMS-620 is a very practical choice. It provides a significant amount of torque for a low cost, making it ideal for projects where multiple powerful servos are needed. It is a good option for building large, simple animatronics, for basic heavy-lifting tasks, or for the steering on a simple, large-scale rover. It's a workhorse actuator that provides a lot of robotic muscle for the money.
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