KO Propo PS-2144 FET - Digital High Torque Servo

Specifications

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

Last Updated:	2025-08-11
Modulation:	Digital
Torque:	6.0V: 180.50 oz-in (13.00 kg-cm)
Speed:	6.0V: 0.13 sec/60°
Weight:	1.90 oz (53.9 g)
Dimensions:	Length:1.50 in (38.1 mm) Width:0.80 in (20.3 mm) Height:1.60 in (40.6 mm)
Motor Type:	Coreless
Gear Type:	Metal
Rotation/Support:	Dual Bearings
Rotational Range:	(add)
Pulse Cycle:	(add)
Pulse Width:	(add)
Connector Type:	(add)

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The discontinued KO Propo PS-2144 FET is a specialized, high-speed digital servo from the legendary PS-21xx family. It is engineered with a singular focus on providing the maximum possible transit speed, backed by the power and responsiveness of a Field-Effect Transistor (FET) amplifier. This servo is a dedicated speed demon, designed for applications where the quickest possible response time is the only thing that matters. It is the ultimate choice for the tail rotor on a large 600 or 700-class helicopter, where its incredible velocity allows for a perfectly locked-in, professional-level tail. It is also an elite steering servo for 1/10 scale on-road touring cars racing on high-grip carpet.
The defining characteristic of the PS-2144 FET is its single-minded pursuit of speed. The combination of a high-speed motor, an optimized gear ratio, and the powerful FET amplifier results in a servo that moves with almost zero perceptible lag. For the competitive pilot or racer, this provides a massive advantage, allowing for instantaneous corrections and a level of agility that is second to none.
While highly specialized, the extreme speed of the PS-2144 FET can be harnessed by roboticists for unique projects. It would be an excellent actuator for a high-frequency research application, such as controlling a vibrating platform or an optical chopper wheel.