FrSky Servo Guide – Understanding ACT, Xact & Xact BLS Servos
FrSky now offers several high-performance servo families designed for aircraft, helicopters and robotics applications. Each series delivers different levels of torque, speed, precision, and construction quality. To help you choose the right servo for your build, we’ve created this guide outlining the differences between the ACT, Xact, and Xact BLS ranges.
FrSky Servos:
ACT Series – Budget friendly, metal-gear HV servos with CNC aluminium cases, dual bearings and excellent torque-to-price performance, perfect for your every day model.
Xact Series – Precision servos designed for aircraft and helicopters, offering strong performance with lightweight construction, able to be run in FBus and can be updated to run in different frequencies / rates.
Xact BLS Series – Premium brushless-motor variants of the Xact servos, delivering higher speed, higher torque, long service life and outstanding thermal efficiency. Able to receive telemetry feedback to your radio (Current, Voltage, and Temp)
Quick Comparison: ACT vs Xact vs Xact BLS
| Series | Motor Type | Case / Gearing | Sensor | Programmable? |
|---|---|---|---|---|
| ACT | Coreless | Full CNC Aluminium / Metal Gears | Potentiometer | No |
| Xact | Coreless | Full CNC Aluminium / Metal Gears | Hall Effect Sensor | Yes |
| Xact BLS | Brushless | Full CNC Aluminium / Metal Gears | Hall Effect Sensor | Yes |
ACT Series – Key Features
The ACT series represents FrSky’s newest generation of high-performance HV servos. They offer exceptional value for their specification and build quality. All models include:
- Metal gears and all-aluminium CNC machined cases
- 8.4V high-voltage support
- Dual ball bearings and precision potentiometers
- Multiple case formats
Recommended for: Standard setups for aircraft, helicopters and robotics requiring strong torque and speed without the premium price tag.
Xact Series – Key Features
The Xact servos are known for precision output, lightweight design, and smooth response. With the ability to connect via FBus the servos also open up programmable options like travel adjustment and telemetry feedback, key features include:
- Accurate mid-point centering
- Low weight
- Excellent efficiency for competition setups
- Programmable via FBus
- Hall effect sensors for accurate control
- Available in multiple torque classes across wing and fuselage sizes
Recommended for: Competition models and robotics, models requiring specific servo setups or the ability to fine tune your servos to match the model.
Xact BLS Series – Key Features
The Xact BLS series is FrSky’s flagship servo line. These servos deliver the highest performance for aerobatic aircraft and helicopters and are equally at home in large robotic projects.
- Brushless motor for increased torque, efficiency and lifespan
- Extremely fast transit speeds available
- Hall effect sensors for accurate control
- High-resolution positioning
- Programmable via FBus
- Full telemetry feedback via FBus (Current, Temp, Voltage)
Recommended for: Performance helicopters, aerobatic aircraft, precision aerobatics, or any application requiring maximum torque and durability whilst maintaining perfect centering.
Which Servo Should You Choose?
ACT Series: Best budget all-rounder. High torque, high voltage, excellent durability at a very competitive price.
Xact Series: For builds where precision, weight and smooth control matters
Xact BLS: For top-tier performance — 3D, Precision aerobatics, large aircraft and any application needing brushless power and telemetry feedback or programmability.
