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Loss of Control Link

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In case of loss of control link, the Radio Failsafe will trigger, and the drone will automatically engage the RTL flight mode. Visual warnings will show up on both, the Radio Control and the Ground Control Station displays, alerting of such situations:

HERCULES X8 Drone

Figure *. Visual Warning

Below are the main causes for a C2 link loss:

  1. Persistent external 2.4 GHz radio interference

    • This may occur due to the presence of a 2.4 GHz radio beacon antenna nearby.

  2. Drone out of range

    • The drone may exceed the C2 link range depending on flight conditions.
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The range can be reduced due to obstacles obstructing the line of sight.

  1. Improperly tightened antennas

    • Antennas on the remote controller and/or drone may not be secured correctly.

  2. Remote controller battery depletion

    • The remote controller turns off when its battery runs out.
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This Radio Controller model does not send any feedback signal to the flight controller when shutting down.

C2 Link Loss + GPS Degradation​

The RTL flight mode depends on GPS sensor readings for its operation. In case of a combination of C2 link loss and degradation of GPS readings, the Navigation Failsafe will trigger. The drone will automatically land by vertically descending at the position where the Navigation Failsafe was triggered.

The Navigation Failsafe is typically triggered when a continuous GPS glitch is detected. GPS glitches may occur for multiple reasons, including:

  • Flying with low or no sky visibility (e.g., in a deep valley).
  • Inconsistent power supply to the GPS module due to internal electrical failure.

C2 Reacquisition​

In case that the C2 link is reacquired after a C2 link loss, the drone will continue in RTL flight mode, unless the pilot command a new flight mode by pressing the A, C, D buttons.

In the event of Radio Controller being turned off, the lapse of time for reacquisition after the controller is turning on again is less than 5 seconds.