KST X15-1809 V8.0 Brushless HV Mini Servo – 24kgf.cm, 0.07 sec/60°

The KST X15-1809 V8.0 Brushless HV Mini Servo combines impressive power, speed and precision in an exceptionally compact 15mm-wide housing.

Delivering up to 24kgf.cm of torque at 8.4V and an extremely fast 0.07 sec/60° response, the X15-1809 is an excellent choice for 67-inch 3D and aerobatic RC aircraft, as well as RC helicopters and high-performance gliders.

Despite its compact size, the X15-1809 offers the performance normally associated with much larger servos. Its brushless motor, hardened steel gears and dual ball bearings provide the power and precision required for demanding control surfaces.

Compact Size – Serious Performance

With a compact 15 × 35.5 × 35.5mm housing, the X15-1809 is an excellent alternative to conventional 20mm standard-size servos when installation space and weight are important.

Its compact footprint makes it particularly attractive for modern 67-inch 3D and aerobatic models, where strong and fast servos are required without adding unnecessary weight or taking up valuable space inside the wing or fuselage.

The X15-1809 is ideal for applications where you need:

• High torque

• Extremely fast response

• Compact dimensions

• Low installation space

• Precise centering

• High mechanical durability

24kgf.cm Torque & 0.07 sec Speed

The X15-1809 provides an excellent combination of torque and speed.

At 8.4V, it delivers 24kgf.cm of torque with a very fast 0.07 sec/60° speed.

Performance by voltage:

• 18kgf.cm / 0.09 sec/60° @ 6.0V

• 22kgf.cm / 0.08 sec/60° @ 7.4V

• 24kgf.cm / 0.07 sec/60° @ 8.4V

This makes the X15-1809 particularly well suited to fast-response applications such as 3D aerobatics, precision aerobatics and helicopter cyclic control.

Excellent Choice for 67" 3D & Aerobatic Aircraft

The compact dimensions and high torque make the X15-1809 a particularly interesting servo for 67-inch class aerobatic and 3D aircraft.

It can be used for demanding control surfaces such as:

• Ailerons

• Elevators

• Rudders

• Flaps

For pilots looking for a compact alternative to a conventional 20mm servo, the X15-1809 provides an impressive 24kgf.cm of power in a 15mm-wide case.

This makes it an excellent choice for modern lightweight, high-performance aerobatic aircraft where both weight and servo performance matter.

Powerful Brushless Motor

The X15-1809 is equipped with a high-performance brushless DC motor.

The brushless motor provides fast response, smooth operation and excellent durability. This is particularly beneficial in 3D and aerobatic aircraft, where the servos are constantly making rapid and precise movements.

Combined with KST's digital control electronics, the brushless motor provides accurate positioning and responsive control.

Hardened Steel Gear Train

The X15-1809 features a robust hardened steel gear train designed for demanding applications.

The steel gears provide excellent durability and resistance to wear, even when the servo is subjected to high control-surface loads.

Two ball bearings support the output shaft, helping to provide smooth operation, accurate positioning and excellent mechanical stability.

CNC Aluminum Alloy Housing

The servo features a rigid CNC aluminum alloy housing that provides excellent mechanical strength while helping to dissipate heat.

The compact housing offers an excellent balance between strength and weight, making the X15-1809 suitable for both aircraft and helicopter applications.

Versatile RC Servo

Although the X15-1809 is well known as a high-performance helicopter servo, its compact dimensions and high torque make it equally useful for many fixed-wing applications.

Recommended for:

• 67-inch 3D RC aircraft

• 67-inch aerobatic models

• Large aerobatic control surfaces

• RC helicopters

• Cyclic / swash plate applications

• High-performance gliders

• Lightweight scale aircraft

• Models requiring a compact high-torque servo

This versatility makes the X15-1809 an excellent choice for pilots who want one compact, high-performance servo for multiple RC applications.

High-Voltage Performance

The X15-1809 V8.0 operates from 6.0V to 8.4V.

At 8.4V, the servo reaches its maximum performance of 24kgf.cm torque and 0.07 sec/60° speed.

This makes it suitable for modern HV receiver and power systems. Always ensure that the receiver, BEC and power supply are rated for the selected voltage.

Programmable Digital Electronics

The X15-1809 features programmable digital electronics and programmable soft start.

Compatible KST programming tools allow the servo characteristics to be configured to suit different aircraft and helicopter applications.

The servo also supports high-speed operation when correctly configured.

Key Features

• 24kgf.cm maximum torque @ 8.4V

• 0.07 sec/60° speed @ 8.4V

• Compact 15mm-wide design

• Ideal for 67-inch 3D & aerobatic aircraft

• High-performance brushless DC motor

• Durable hardened steel gears

• Dual ball bearings

• CNC aluminum alloy housing

• HV operation from 6.0–8.4V

• Programmable digital electronics

• Programmable soft start

• 25T / 6mm output spline

• Suitable for aircraft, helicopters and gliders

Technical Specifications

Package Contents

• 1 × KST X15-1809 V8.0 Brushless HV Mini Servo

• 1 × Servo Accessory Set

Recommended Application

For aircraft applications, always check the manufacturer's recommended servo dimensions, torque requirements and installation method.

The X15-1809 is particularly well suited to 67-inch class 3D and aerobatic aircraft where a compact 15mm servo with high torque and very fast response is required.

For helicopter applications, verify the required servo dimensions, spline and linkage geometry before installation.

KST X15-1809 V8.0 – Compact Size. Serious Power.

The KST X15-1809 V8.0 delivers 24kgf.cm of torque and 0.07 sec/60° speed at 8.4V in a compact 15mm-wide housing.

Whether you're building a 67-inch 3D aircraft, aerobatic model, high-performance glider or RC helicopter, the X15-1809 provides the combination of brushless performance, hardened steel gears, high torque and compact dimensions needed for demanding RC applications.