Failsafes
The aircraft has several automatic failsafes which can trigger in flight. There are several actions that can be taken on a failsafe such as: change the flight mode to rally, jump to the planned landing in the mission, and emergency land in place.
Warning: If a failsafe is active and the operator changes flight modes or target waypoint, they will override the failsafe action. This can be used to change what the vehicle is doing, but can result in cancelling a battery failsafe for example, which can lead to the loss of the aircraft.
Low battery
The main battery has been below 18.0V for 10 seconds. The aircraft will automatically fly the preplanned landing.
Caution: Failure to include a landing in the planned mission will cause the aircraft to change mode to rally and not land, which can result in damage to the batteries.
Critical battery
The main battery has been below 15.0V for 10 seconds. The aircraft will automatically perform an emergency landing in place (QLand).
Caution: The aircraft should always be landed before 16.2V as described in the system limits. Flying to the critical battery failsafe is not intended for normal use. It is intended to provide a last chance recovery, and the battery may have been damaged before this activates.
GCS (telemetry radio)
This is activated by a loss of communication between the GCS and aircraft (telemetry radio) for more than 15 seconds. The aircraft will automatically change modes to rallly.
Warning: Operating the aircraft with the GCS failsafe disabled is unsafe as it can result in loss of control of the aircraft.
RC controller
This is activated by a loss of communication between the RC controller and aircraft for more than 15 seconds. The aircraft will automatically change modes to rally.
Circular geofence
If the aircraft flies too far away from home then the circular fence will be triggered.
The map will be shaded red for any region that would be considered to be too far away.
The aircraft will repeatedly switch to Rally until the aircraft is back within the geofence.
The radius can be changed in the Settings ⇨ Failsafe.
High altitude geofence
If the aircraft flies to high above home then the high altitude fence will be triggered.
The aircraft will repeatedly switch to Rally until the aircraft is back within the geofence.
The altitude can be changed in the Settings ⇨ Failsafe.
High wind during takeoff
This is activated by high winds, greater than 12 m/s, during takeoff. This indicates the aircraft is experiencing excessive winds and it is unsafe to continue flight. The aircraft will automatically perform an emergency landing in place (QLand), and the messages dialog will show “Failed to complete takeoff, excessive wind".
Caution: Emergency land will land vertically wherever the aircraft currently is, this may not be the same as where the aircraft took off from.
Takeoff took too long
If the takeoff takes more than 45 seconds, the aircraft may consume too much VTOL battery capacity to safely continue the mission. It may have enough to finish the takeoff, but may not have enough remaining capacity to land. The aircraft will automatically perform an emergency landing in place (QLand), and the messages dialog will show “Failed to complete takeoff within time limit”
Caution: Emergency land will land vertically wherever the aircraft currently is, this may not be the same as where the aircraft took off from.
Transition to forward flight failed
If the transition to forward flight takes more than 11 seconds the aircraft is not performing correctly. There may be a problem with the main motor or propeller. The aircraft will automatically perform an emergency landing in place (QLand), and the messages dialog will show “Transition failed, exceeded time limit"
Caution: Emergency land will land vertically wherever the aircraft currently is, this may not be the same as where the aircraft took off from.
Low airspeed
The aircraft has experienced unusually low airspeed while in forward flight and is at risk of stalling. The aircraft automatically beings a transition to forward flight again, the VTOL motors will turn, the forward motor will go full throttle and the aircraft will maintain a level attitude till the transition is complete. If this transition takes to long the transition failsafe can activate.
Caution: If this failsafe activates repeatedly something is wrong with the forward propulsion. The aircraft should be brought back to the preplanned landing as this failsafe rapidly consumes the VTOL battery.