Suggesting an enhanced RTL, which will retrace for 10s to avoid rc signal been blocked


Always wonder why plane couldn’t have something semi_SmartRTL, as in the ArduCoper.
The idea is, when the plane is blocked by obstacles accidentally, it has the ability to get back to regain RC control by retracing for a few seconds. The enhanced RTL don’t need to retrace all the way back to Home point. A few seconds are enough to get out off the shadow.
Semi_Smart, right? :sweat_smile:

Plane starts circling when RC connection is lost which with the right circle radius basically has the same result that you described.


It would be a little terrifying just to rely on circling out of RC signal shadow.
And we don’t know the plane needs a right or left circle.
The best way out maybe to trace its original forth path ( in tight circle to avoid collision) back for some distance where the plane regain signal

Well then first smartRTL have to be implemented in plane.

Really hoping to see NEW RTL been implemented in future version of Arduplane.
No drawback. RTL_crash saver :crazy_face:

Can’t a Lua check for status and in case of fail safe it changes the mission and goes backwards starting from the last waypoint and so on?
Would need to have fail safe to continue with mission and Lua to manipulate the mission.
It is a poor man smartRTL :slight_smile:

Or keep updating a point where the plane will flight back in case of rc failsafe. This could be quite easy…

If you fly back the waypoints in reversed order there is no risk of collision. Updating a safe point could be tricky while a waypoint already flown is safe because plane already flown it safely.

Indeed. However I’m not a fan of modifying mission items on the fly… :slight_smile:

We do it all the time it works flawlessly.

Obviously with a copter you can retrace your flight exactly. With a plane a half circle is normally required and this involves the risk of encountering an obstacle as in the diagrams above. An immelmann would avoid that problem - but not all aircraft would be capable of that manoeuvre.

The idea does have merit (and less risk) when the reason for RTL is loss of signal due to the aircraft flying out of range of the control transmitter - as retracing the flight path could be a more reliable way of immediately regaining the signal than circling which, depending on wind direction, etc, can just cause the aircraft to fly further away from the controller.

Having the idea implemented as an optional form of RTL (whether in a mission or not) has merit in my view.

doesnt plane have rally points that could be used for this?

Indeed, “less risk” is all we need when RTL mode been triggered.
The immelmann manoeuvre definitely can void collision, just kind of power demanding for the FPV plane. Maybe a tighter half circle back is a more conservative solution.

Rally points need to be pre_planned for every mission, and that may become a puzzle :dizzy_face:
Considering RTL as rescuing hostage. Sneak in, and the same path sneak back

What about gaining some altitude and then doing a split-S maneuver? (Or going straight into the split-S if there is enough altitude margin?) This should require less power than an immelmann, no?

I wonder if we could just tie this into the scripted aerobatics functionality…

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