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Cirrus CS-503RBB - Mini Retract Servo

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Notes

• The discontinued Cirrus CS-503RBB is a highly specialized, non-proportional servo designed specifically for operating retractable landing gear in RC aircraft. The "R" in its name signifies "Retract," meaning it is designed for simple, end-to-end travel rather than proportional control. When it receives a signal, it rotates its full range to either lock the gear in the up or down position. The "BB" indicates the inclusion of a premium ball bearing on the output shaft. This is a critical feature for a retract servo, as it ensures smooth, reliable operation and can better handle the side-loads imposed by heavy or complex landing gear systems.
• The purpose of the CS-503RBB is to provide a robust and foolproof solution for retractable gear. The non-proportional action simplifies setup and ensures the gear is always firmly locked in place. The ball bearing makes it a superior choice for larger models with heavier struts and wheels, as it reduces friction and strain on the servo motor and geartrain. This leads to a more reliable and longer-lasting retract system, which is crucial for preventing a dangerous gear-up landing. It is the servo of choice for scale modelers who want the ultimate in retract system reliability.
• While its non-proportional nature makes it unsuitable for most robotics tasks, the CS-503RBB's unique function can be cleverly adapted. It is the perfect actuator for any simple, binary (open/closed, on/off) robotic mechanism that needs to be both strong and reliable. Examples include opening a heavy payload bay door, deploying a large sensor mast, or actuating a powerful locking clamp. Its purpose-built design makes it an incredibly robust solution for these kinds of two-position tasks.

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