USER GUIDE
72
If there are obstacles in the path between the model and home, RTH will not be able to avoid them. You
are responsible for your model, even when RTH is engaged!
If the wind speed is higher than the RTH speed of the model, determined by its settings, the model will
NOT return home if flying into the wind.
RTH will NOT engage if the GPS signal quality is not adequate. “Land” safety mode will engage instead.
For multirotors, additionally RTH will only work correctly if your compass is correctly installed and
calibrated, as described elsewhere in this document.
For fixed wing, RTH throttle control will not engage if your altitude reading is less than about 60
feet/20 meters, or if your speed is less than 3 MPH or 3K/H, when RTH is triggered. The throttle will
remain off in these conditions. Also, the RTH throttle will not engage until you have “armed” the throttle
by moving the throttle stick up at least once after power-up.
6.4.2 RTH Ground Testing
If RTH is configured correctly, after your GPS as acquired a fix and the home position is set, when you turn your
transmitter off (ON THE GROUND) the “RTH Engaged…” message should appear in the OSD notification area of
the video screen. Additionally, the Flight Mode Indicator on the video screen should change to “RTH”. If you
don’t see BOTH these notifications, RTH will not activate in the event of a receiver failsafe. Please refer back to
the RTH configuration section if RTH does not trigger correctly.
For fixed wing models, don’t forget that your propeller may spin at any time when RTH is triggered, even
on the ground!
6.4.3 In-air RTH Testing
The simplest way to test RTH in the air is to program a mode/submode switch position to “RTH Test”. When
this switch position is selected, RTH should engage, and your model should fly toward the home point.
Never intentionally turn off your radio to test RTH in the air. There is a chance that your receiver will
not link back up with your radio, which could result in a crash!
When in RTH test mode, moving the control stick causes RTH to disengage, and the model switches to 2D with
Hold flight mode.
Note that for proper operation of RTH Test mode, your trim settings must have been recorded during the Radio
Control Wizard. If you have made significant changes to your trim settings since you ran the Wizard, the
message “RTH Engaged: Release Sticks for Test” may appear when RTH is activated, and RTH will not engage.
Note: if your multirotor is in Polar or Cartesian flight mode and RTH Test is triggered, remember that it will
switch to 2D with Hold flight mode during the RTH testing, so the control stick will control the multirotor
differently during RTH testing!
If you find that your model returns home correctly, no further adjustments should be necessary. If problems
occur, refer to the Troubleshooting chart later in the document.
Don’t forget to switch out of RTH Test mode before landing!
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