KO Propo PS-51 BS Servo

Specifications

Source: Most data comes from the manufacturer but some data is sourced from our loyal community.

Last Updated:	2025-08-11
Modulation:	Analog
Torque:	6.0V: 30.60 oz-in (2.20 kg-cm)
Speed:	6.0V: 0.18 sec/60°
Weight:	0.81 oz (23.0 g)
Dimensions:	Length:1.18 in (30.0 mm) Width:0.63 in (16.0 mm) Height:1.30 in (33.0 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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The discontinued KO Propo PS-51 BS is a high-performance analog servo from the esteemed PS line, likely featuring a high-end Brushless motor ("B") and tuned for high-Speed ("S"). This servo is a dedicated speed demon, designed for applications where the quickest possible response time is the only thing that matters, but with the added benefits of brushless technology. It is the ultimate tail rotor servo for a large 700-class helicopter, where its instantaneous, brushless-driven response is key. It is also an elite steering servo for a 1/10 scale touring car on a high-grip track.
The defining characteristic of the PS-51 BS is its single-minded pursuit of speed, combined with the longevity of a brushless motor. The brushless motor provides a level of agility and responsiveness that is a cut above even coreless servos, and it will maintain this peak performance for an incredibly long service life. It is a specialized instrument for the pure speed enthusiast who also values long-term reliability.
While highly specialized, the extreme speed of the PS-51 BS can be harnessed by roboticists for unique projects. It would be an excellent actuator for a high-frequency research application. For any robotics project where the absolute maximum speed is required from the actuator, and it needs to run for thousands of hours, the PS-51 BS is a professional-grade solution.