KO Propo PS-51 S 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: 0.20 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 S is a high-quality analog servo in the popular sub-micro class, upholding the KO Propo standard of quality and precision in a compact package. The "S" designation often refers to it being a "Standard" but high-quality offering for its size. This servo is aimed at the discerning builder of park flyers, small gliders, and other lightweight aircraft who prefers the smooth feel of an analog servo but demands a higher level of performance and reliability than generic offerings. The PS-51 S is known for its exceptionally smooth gear train, precise centering, and long-lasting consistency, making it a favorite among experienced modelers.
The essence of the PS-51 S is its role as a premium-quality, general-purpose sub-micro servo. It provides a tangible step up in refinement from more basic 9g servos, resulting in a more connected and confident flight experience. For the hobbyist who is building a high-quality scale model or a smooth-flying sport plane, the PS-51 S is a smart choice that complements the quality of the airframe. It is a trusted, classic component that embodies the KO Propo commitment to precision engineering.
In the realm of high-fidelity micro-robotics, the KO Propo PS-51 S is an excellent actuator. It is ideal for building a high-quality, jitter-free camera pan-and-tilt mechanism, or for the joints of a small robotic manipulator where accurate and smooth, repeatable motion is required.