Servo Specs, Reviews, & Comparison Tool
Blue Bird BMS-621 - High Speed Standard Servo
Specifications
| Last Updated: | 2025-08-04 |
| Modulation: | Analog |
| Torque: |
4.8V: 89.00 oz-in (6.41 kg-cm) 6.0V: 100.00 oz-in (7.20 kg-cm) |
| Speed: |
4.8V: 0.13 sec/60° 6.0V: 0.10 sec/60° |
| Weight: | 1.45 oz (41.1 g) |
| Dimensions: |
Length:1.60 in (40.6 mm) Width:0.80 in (20.3 mm) Height:1.50 in (38.1 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 Blue Bird BMS-621 is a high-performance analog servo that stands out in the standard-size class due to its excellent speed and precision, thanks to the inclusion of a coreless motor and dual ball bearings. This servo is aimed at discerning pilots who value a refined feel and a fast response from their controls. It is an excellent choice for a wide range of applications, including the control surfaces on a precision aerobatic (F3A) pattern plane, a high-performance sport model, or as a very responsive tail servo on a larger helicopter. The coreless motor provides a smooth, immediate response, while the dual ball bearings ensure that this response is delivered with pinpoint, slop-free accuracy.
- The character of the BMS-621 is defined by its smooth, refined speed. It doesn't just move quickly; it moves with a fluidity and precision that is a cut above standard servos. The coreless motor eliminates the "cogging" inherent in conventional motors, and the dual ball bearings eliminate any play in the output shaft. This results in a very direct, high-fidelity connection between the pilot's stick and the control surface. It's a servo that rewards smooth, precise inputs and can make any aircraft feel more locked-in and responsive.
- For roboticists, the BMS-621 is a premium analog actuator for tasks that require smooth, fast, and precise motion. It would be an ideal choice for building a high-performance camera tracking system, where its fluidity would result in a very stable image. It would also be well-suited for creating lifelike animatronics, as its smooth motion is much more natural looking than the sometimes-jerky movement of standard servos. It is the perfect choice when a project's goal is to achieve fast, yet graceful, motion.
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