FrSky

FrSky Xact BLS5404H Brushless HV Servo – 707 oz-in, 0.11 sec, Soft Start, FBUS Telemetry

In stock
SKU: 03050629
(2)
$79.75

The FrSky Xact BLS5404H is a premium giant-scale brushless HV servo engineered for high-load RC aircraft, turbine jets, and precision aerobatic applications. Delivering up to 707 oz-in of torque at 8.4V with fast 0.11 sec/60° speed, Soft Start technology, hall sensor precision, and FBUS telemetry capability, the BLS5404H is designed for pilots who demand serious control authority and reliability.

FrSky Xact BLS5404H Brushless High Torque HV Servo

The FrSky Xact BLS5404H is part of the Xact 5400 Series brushless servo lineup and is built for demanding RC applications where torque, precision, and durability matter. It features a fully CNC-machined aluminum protective case, metal gear train, brushless motor system, dual precision ball bearings, and high-voltage operation up to 8.4V.

With support for FBUS, SBUS, and PWM, this servo works with a wide range of control setups. When used in FBUS mode with compatible FrSky receivers or flight controllers, the servo can provide telemetry feedback such as real-time voltage, current, and temperature.

The integrated Soft Start function helps reduce sudden startup shock loads on linkages, gears, and control surfaces during power-up, making it especially useful in large aircraft with high-load control surfaces.

Recommended Applications

  • 50cc–120cc giant scale RC airplanes
  • Turbine jets
  • IMAC and precision aerobatic aircraft
  • Large rudder and elevator surfaces
  • High-load scale warbirds
  • Large sport and 3D aircraft

Key Features

  • Up to 707 oz-in / 50.9 kg-cm torque at 8.4V
  • Fast 0.11 sec/60° speed at 8.4V
  • Brushless motor for efficiency, durability, and long service life
  • Hall sensor precision for smooth, accurate positioning
  • Soft Start technology helps reduce startup shock loads
  • Supports FBUS, SBUS, and PWM protocols
  • Telemetry feedback through FBUS mode: voltage, current, and temperature
  • Fully CNC-machined aluminum protective case
  • Heavy-duty metal gear train
  • Dual precision ball bearings
  • High-voltage operation from 4.8V to 8.4V
  • Configurable servo travel: 90°, 120°, or 180°
  • Firmware updatable through the FrSky ecosystem

Why Choose a Brushless Servo?

Brushless servos offer longer service life, improved efficiency, smoother operation, and better heat management compared to traditional brushed servos. Combined with hall sensor positioning technology, the BLS5404H delivers precise centering and consistent control authority for demanding giant-scale aircraft applications.

FBUS Telemetry Advantage

When connected through FBUS with compatible FrSky equipment, the Xact BLS5404H can send servo telemetry data back to the radio system. This allows supported setups to monitor useful servo information such as voltage, current, and temperature, helping pilots better understand the health and load of their control system.

Product Specifications

Specification Details
Brand FrSky
Model Xact BLS5404H
Servo Type Brushless High-Voltage Digital Servo
Motor Type Brushless
Gear Type Metal Gear
Case Fully CNC-Machined Aluminum
Operating Voltage 4.8V – 8.4V
Torque @ 8.4V 50.9 kg-cm / 706.9 oz-in
Speed @ 8.4V 0.11 sec/60°
Dimensions 40 × 20 × 33.5 mm
Weight 77.5 g / 2.73 oz
Horn Spline Φ6 25T
Bearings Dual Precision Ball Bearings
Max Refresh Rate 333Hz
Supported Protocols FBUS, SBUS, PWM
Servo Travel Configurable: 90°, 120°, 180°

Torque & Speed Performance

Voltage Torque Speed
6.0V 43.6 kg-cm / 605.5 oz-in 0.15 sec/60°
7.0V 47.2 kg-cm / 655.5 oz-in 0.12 sec/60°
8.4V 50.9 kg-cm / 706.9 oz-in 0.11 sec/60°

Xact 5400 Series Comparison

Model 6.0V 7.0V 8.4V
BLS5401H 17.2 kg-cm / 238.9 oz-in
0.05 sec		 20.0 kg-cm / 277.8 oz-in
0.04 sec		 22.8 kg-cm / 316.6 oz-in
0.03 sec
BLS5402H 28.0 kg-cm / 388.9 oz-in
0.07 sec		 34.4 kg-cm / 477.7 oz-in
0.06 sec		 38.3 kg-cm / 531.9 oz-in
0.05 sec
BLS5403H 35.5 kg-cm / 493.0 oz-in
0.11 sec		 43.0 kg-cm / 597.2 oz-in
0.09 sec		 48.9 kg-cm / 679.1 oz-in
0.08 sec
BLS5404H 43.6 kg-cm / 605.5 oz-in
0.15 sec 		47.2 kg-cm / 655.5 oz-in
0.12 sec 		50.9 kg-cm / 706.9 oz-in
0.11 sec
BLS5405H 46.3 kg-cm / 643.0 oz-in
0.17 sec		 52.9 kg-cm / 734.6 oz-in
0.14 sec		 54.9 kg-cm / 762.4 oz-in
0.12 sec

Recommended Accessories

  • Heavy-duty aluminum servo arms
  • FrSky FBUS-capable receivers
  • High-current switches and power distribution systems
  • Giant scale servo extensions
  • Heavy-duty linkage hardware
  • Dual battery systems for large aircraft

Important Setup Notes

  • Use a properly rated receiver battery, regulator, or power distribution system for high-current HV servo operation.
  • For best results, use rigid linkages and high-quality servo arms suitable for giant-scale loads.
  • Servo telemetry requires compatible FrSky FBUS equipment.
  • Servo travel and configuration options can be adjusted using supported FrSky configuration tools.

What’s Included

  • FrSky Xact BLS5404H Brushless High Torque HV Servo
  • Factory packaging
  • SKU 03050629