Spirit GT Motorized Tail Configuration Issue – Channel 4 Locked / UI Options Missing (v4.0.4)
Posted: Mon 13. Jul 2026 17:22:09
Hello Spirit Support Team,
I am experiencing a critical issue configuring a motorized tail on a new build using the Spirit GT, and I need your assistance to identify why Channel 4 is refusing to output a signal.
My Hardware Setup:
Flybarless Unit: Spirit GT (Running Settings Software v4.0.4)
Receiver Protocol: FrSky F.Bus (All channel mappings verified green; Throttle mapped to Channel 1, Rudder to Channel 4)
Tail ESC: Hobbywing Skywalker 80A
The Problem:
When configured for a motorized tail, Channel 4 remains completely dead. When monitoring the Diagnostic Tab, pushing the main collective/throttle stick upward results in 0% movement/activity on the Rudder output bar. The gyro is completely locking out the tail signal.
Troubleshooting Already Completed:
ESC Verification: The Hobbywing Skywalker ESC has been isolated and directly calibrated via a standalone receiver channel. It arms, initializes, and spins perfectly when bypassed, proving the ESC hardware is functional and calibrated.
Servo Tab Configuration: On the Servos page, the configuration correctly shows "Rudder (CH4) - Low RPM: 2", confirming the unit recognizes a motorized layout.
The UI Dropdown Lockout: When navigating to the General -> Governor/Throttle -> Settings window, the dropdown selection menu directly under the "Max. Head Speed (4000 RPM)" box is completely grayed out or entirely missing from the interface, I am unable to explicitly select the "Electric (Motorized Tail)" operating profile.(not sure if this is normal, please advise.) however I have selected the "Electric (Motorized Tail)" operating profile.in the expert settings section
Governor Conflicts: If I simply force the main "Governor" checkbox on, the tail ESC emits continuous error beeps, and the main motor initiates an aggressive soft-start delay, indicating a profile conflict. Turning the governor off stops the beeping but leaves Channel 4 completely dead.
Limits Tab: I have lowered the Rudder ESC - Stop safety slider as low as 100–124, but the ESC still fails to receive an arming signal from the GT.
Because my software UI seems to be missing the explicit motorized tail profile selection under the Governor settings, ( again, I am not sure if this is so )is this a firmware profile mismatch or a specific initialization sequencing step I am locked out of?
Please let me know how to unlock the proper interface settings or force the Spirit GT to dynamically link the Throttle input channel to the Channel 4 Rudder output.
Thank you,
I am experiencing a critical issue configuring a motorized tail on a new build using the Spirit GT, and I need your assistance to identify why Channel 4 is refusing to output a signal.
My Hardware Setup:
Flybarless Unit: Spirit GT (Running Settings Software v4.0.4)
Receiver Protocol: FrSky F.Bus (All channel mappings verified green; Throttle mapped to Channel 1, Rudder to Channel 4)
Tail ESC: Hobbywing Skywalker 80A
The Problem:
When configured for a motorized tail, Channel 4 remains completely dead. When monitoring the Diagnostic Tab, pushing the main collective/throttle stick upward results in 0% movement/activity on the Rudder output bar. The gyro is completely locking out the tail signal.
Troubleshooting Already Completed:
ESC Verification: The Hobbywing Skywalker ESC has been isolated and directly calibrated via a standalone receiver channel. It arms, initializes, and spins perfectly when bypassed, proving the ESC hardware is functional and calibrated.
Servo Tab Configuration: On the Servos page, the configuration correctly shows "Rudder (CH4) - Low RPM: 2", confirming the unit recognizes a motorized layout.
The UI Dropdown Lockout: When navigating to the General -> Governor/Throttle -> Settings window, the dropdown selection menu directly under the "Max. Head Speed (4000 RPM)" box is completely grayed out or entirely missing from the interface, I am unable to explicitly select the "Electric (Motorized Tail)" operating profile.(not sure if this is normal, please advise.) however I have selected the "Electric (Motorized Tail)" operating profile.in the expert settings section
Governor Conflicts: If I simply force the main "Governor" checkbox on, the tail ESC emits continuous error beeps, and the main motor initiates an aggressive soft-start delay, indicating a profile conflict. Turning the governor off stops the beeping but leaves Channel 4 completely dead.
Limits Tab: I have lowered the Rudder ESC - Stop safety slider as low as 100–124, but the ESC still fails to receive an arming signal from the GT.
Because my software UI seems to be missing the explicit motorized tail profile selection under the Governor settings, ( again, I am not sure if this is so )is this a firmware profile mismatch or a specific initialization sequencing step I am locked out of?
Please let me know how to unlock the proper interface settings or force the Spirit GT to dynamically link the Throttle input channel to the Channel 4 Rudder output.
Thank you,