KST A20-4515 V8.0 Brushless HV Servo – 50kg.cm High-Torque Servo

The KST A20-4515 V8.0 Brushless HV Servo is a premium high-torque digital servo designed for demanding large-scale RC aircraft, 3D aerobatic models and high-performance airplanes.

Delivering an impressive 50kg.cm of torque at 8.4V, the A20-4515 provides the power required for large control surfaces and high-load applications. Its combination of a powerful brushless motor, heavy-duty metal gear train, CNC aluminum housing and dual ball bearings delivers the precision, strength and durability expected from a high-end KST servo.

With its high-voltage capability and compact standard-size footprint, the A20-4515 V8.0 is an excellent choice for pilots who want maximum servo power without moving to a larger oversized servo.

50kg.cm of High-Torque Performance

The A20-4515 V8.0 is designed for applications where servo torque is critical.

With up to 50kg.cm of torque at 8.4V, it provides a substantial power reserve for large control surfaces and demanding flight conditions.

This makes the servo especially suitable for:

• Large-scale aerobatic RC aircraft

• 3D RC airplanes

• Giant-scale aircraft

• Large Extra, Edge and Slick models

• High-performance aerobatic models

• Large ailerons and elevators

• High-load rudders

• Large flaps

• Other demanding RC applications

The high torque output provides strong and precise control even when large control surfaces are subjected to significant aerodynamic loads.

High-Performance Brushless Motor

At the heart of the A20-4515 V8.0 is a high-performance brushless DC motor.

The brushless design provides fast response, excellent efficiency and long-term durability, making it particularly well suited to high-performance RC aircraft where servos are exposed to continuous and rapidly changing loads.

Combined with KST's digital control electronics, the brushless motor provides smooth and accurate positioning throughout the servo's operating range.

Heavy-Duty Metal Gear Train

The A20-4515 V8.0 features a robust metal gear train engineered for high-load applications.

The heavy-duty gears are designed to withstand the loads generated by large control surfaces while maintaining accurate positioning and reliable operation.

For large-scale aerobatic aircraft, where control surfaces can generate substantial aerodynamic forces, a strong metal gear train is essential for maintaining precise control.

CNC Aluminum Housing

The precision-machined CNC aluminum housing provides excellent rigidity and durability while helping to dissipate heat during demanding operation.

The strong metal case also provides a secure mounting platform, making the A20-4515 suitable for serious large-scale RC applications.

Despite its high torque output, the servo maintains a compact form factor, making it easier to install in models where space is limited.

High-Voltage Operation

The A20-4515 V8.0 is designed for modern HV RC power systems and can operate at up to 8.4V.

Running the servo at 8.4V allows it to deliver its maximum 50kg.cm torque, making it an excellent match for modern 2S LiPo or LiFe receiver systems when used with an appropriate power setup.

Always ensure that your receiver and power system are rated for the selected servo voltage.

Precision and Reliability for Large RC Aircraft

Large aerobatic and 3D aircraft require servos that can maintain accurate positioning under high aerodynamic loads.

The A20-4515 V8.0 is designed to provide:

• High torque reserve

• Fast and precise response

• Excellent holding power

• Smooth operation

• High mechanical durability

• Reliable performance under demanding loads

This makes it a strong choice for pilots looking for a premium high-torque servo for large RC aircraft.

Ideal for Large-Scale Aerobatic & 3D Models

The KST A20-4515 V8.0 is particularly well suited for:

• Large-scale aerobatic aircraft

• 3D RC aircraft

• Giant-scale models

• Extra and Edge aerobatic aircraft

• Large Slick and other 3D models

• High-performance scale aircraft

• Large control surfaces

• High-load rudder, elevator and aileron applications

For large aerobatic aircraft where maximum servo power is important, the A20-4515 offers an excellent combination of 50kg.cm torque, brushless performance and heavy-duty construction.

Key Features

• 50kg.cm maximum torque @ 8.4V

• High-performance brushless DC motor

• High-voltage operation

• Heavy-duty metal gear train

• Precision CNC aluminum housing

• Dual ball bearings

• Digital servo electronics

• High torque with a compact servo footprint

• Designed for demanding large-scale RC aircraft

• Excellent choice for aerobatic and 3D models

Package Contents

• 1 × KST A20-4515 V8.0 Brushless HV Servo

• 1 × Servo Accessory Set

Recommended Application

For maximum performance, the A20-4515 V8.0 should be used with a suitable HV receiver and power system capable of supplying sufficient current to the servo system.

For large aircraft using multiple high-torque servos, make sure the receiver power supply and wiring are appropriately sized for the expected peak current.

KST A20-4515 V8.0 – Serious Torque for Serious RC Aircraft

When your aircraft demands more from its servos, the KST A20-4515 V8.0 delivers. With an impressive 50kg.cm of torque at 8.4V, a powerful brushless motor and heavy-duty metal gears, it is built for pilots who demand maximum control authority from their large-scale and high-performance RC aircraft.