KO Propo PS-2173 FET - High Speed Power 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: 111.00 oz-in (7.99 kg-cm)
Speed:	6.0V: 0.09 sec/60°
Weight:	1.93 oz (54.7 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-2173 FET is a high-performance digital servo that has achieved a legendary status in the RC racing world. As a cornerstone of the esteemed PS-21xx family, it is known for its perfect blend of blistering speed and precision, all driven by a powerful Field-Effect Transistor (FET) amplifier. The PS-2173 is the quintessential high-performance cyclic servo for 500, 600, and 700-class 3D helicopters. Its immediate, high-fidelity response allows for the most aggressive and precise maneuvers, giving the pilot a completely connected and confident feel. It is also a top-tier steering servo for 1/8 scale racing.
The essence of the PS-2173 FET is its reputation as a competition-winning instrument. For a generation of top helicopter pilots and car racers, this was the servo to have. Its combination of a high-speed motor, digital precision, and the raw power of its FET amplifier made it the benchmark for professional-level performance. It is a servo that has been proven at the highest levels of competition around the world, known for its incredible responsiveness and reliability.
In advanced, dynamic robotics, the KO Propo PS-2173 FET is a fantastic tool. Its combination of high speed, precision, and a robust build makes it ideal for the joints of a fast-moving, high-payload robotic arm or the legs of a dynamic walking robot.