KO Propo PS-87 FET 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:	7.2V: 72.20 oz-in (5.20 kg-cm)
Speed:	7.2V: 0.10 sec/60°
Weight:	2.19 oz (62.0 g)
Dimensions:	Length:1.61 in (40.9 mm) Width:0.83 in (21.1 mm) Height:1.38 in (35.1 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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The discontinued KO Propo PS-87 FET 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. 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-87 is known for its exceptionally smooth gear train, precise centering, and long-lasting consistency, making it a favorite among experienced modelers. A key feature is its use of a Field-Effect Transistor (FET) amplifier, which allows it to be more powerful and responsive than standard micro servos.
The essence of the PS-87 FET is its role as a premium-quality, general-purpose sub-micro servo. It provides a tangible step up in refinement and performance 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-87 is a smart choice that complements the quality of the airframe.
In the realm of high-fidelity micro-robotics, the KO Propo PS-87 FET 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.