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Emergency Failsafe’s
There are some circumstances that pose risks to any remote controlled aircraft that could risk the device to loss or
damage, the first being loss or interruption to the control signal and the second being a low charge flight battery not being
able to sustain flight and the flight controller is able to enable two failsafe’s to try and counter these problems.
RTL
(Return to land): If there is an event where the radio control signal is to become too weak or completely
interrupted the FARMEYES will change the flight mode to RTL and the FARMEYES will then behave in the same
way as a controller with the SW2 switch set to position 2. Circumstances that may lead to RTL failsafe can include
controller low battery, obstacle or interference to control signal or flying to maximum control range. When flying to
the maximum control range the typical result is the machine will hover at the edge of control range and then begin to
return however as the FARMEYES returns to within control range you can often take over control again. If trying to
regain control it is safest to make sure the throttle is at 50% or greater then move the SW2 switch to position 2 (RTL
mode) then move the switch to position 1 (GPS loiter).
Auto-Land
: If the voltage of a UAV flight battery is too drop too low its possible for a machine to fall from the sky
unexpectedly as it becomes unable to sustain enough current to all the motors for flight. In order to prevent accidents
the Flight controller in the FARMEYES is designed to monitor the voltage of the Flight battery and when the
voltage has dropped to a pre-set point the Flight controller enables Auto-Land which will cause the machine to land
over its current position. Limitations to this function is that the speed of descent in Auto-Land is slow for safety
reasons however it must be warned that a machine being flown at a very high altitude with a low battery would
spend a long time descending to ground level under Auto-Land that you could possibly run out of battery while still
air born.
WARNING: Auto-Land is an emergency failsafe and should not be relied on as a indicator for battery life. It
is the operators responsibility to be aware of their expected battery life / flight times and to safely land before
the emergency failsafe is enabled.
Note: A responsible operator must be aware of their
When the Auto-Land failsafe is enables the operator still retains control of the Rudder, aileron and elevator controls
which may allow the FARMEYES position to be adjusted away from potential obstacles underneath, however
excessive or wild adjustments may cause instability in the low battery state.
Important tip:
Its best practice for the operator to recognise when the machine has enabled this failsafe mode as it
may happen while you are flying rather than in hover mode. If you are flying and in control of the FARMEYES and
you see the responsiveness has changed or the machine to appear less stable under your adjustments; if safe to do so
simply return the right control stick to the middle position allowing a hover in a fixed position which will allow you
to see if the machine in descending. As Auto-Land disables increases in throttle, if the machine is descending from a
fixed position you can also try increasing throttle and if there is no altitude gain the Auto-Land is probably enabled.
Supplementary information
