Servo Specs, Reviews, & Comparison Tool
Cirrus CS-21BB - Sub-Micro HP Servo
Specifications
| Last Updated: | 2025-08-04 |
| Modulation: | (add) |
| Torque: |
4.8V: 23.00 oz-in (1.66 kg-cm) |
| Speed: |
4.8V: 0.08 sec/60° |
| Weight: | 0.32 oz (9.1 g) |
| Dimensions: |
Length:0.86 in (21.8 mm) Width:0.43 in (10.9 mm) Height:0.77 in (19.6 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 Cirrus CS-21BB is a performance-oriented analog sub-micro servo that combines the precision of a dual ball bearing (BB) supported output shaft with a motor and gear set tuned for higher speed. This makes it a fantastic choice for pilots who want both the accuracy of ball bearings and a quick, responsive control feel. It is aimed at high-performance applications in the 9-gram class, such as the ailerons on an agile park jet or 3D foamie, or as a very responsive cyclic servo on a 450-class helicopter. The CS-21BB delivers a snappy, immediate response, while the dual ball bearings ensure that this speed is delivered without any slop or imprecision.
- The character of the CS-21BB is defined by its "fast and smooth" performance. It gives a model a more nimble and reactive feel, allowing for faster roll rates and crisper maneuvers. The dual ball bearings provide a solid, locked-in feel, so the pilot can be confident that their fast inputs are being translated into accurate movements at the control surface. It is a servo for pilots who enjoy aggressive, high-energy flying and appreciate a control system that can keep up with their commands.
- In robotics, the CS-21BB's combination of speed and precision makes it a very versatile actuator. It is well-suited for building fast and accurate robotic manipulators, such as a pick-and-place arm that needs to operate with a short cycle time. It would also be a great choice for a competitive robot that requires a fast-acting mechanism, or for a sensor tracking system that needs to follow a target with both speed and accuracy. It offers a powerful combination of velocity and fidelity for demanding robotics projects.
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