DJI-Tim Posted at 2015-9-15 10:03
It would better go home most of the times, except  POI behind the object with RC lost

specially POI even behind the subject should not matter, the RTH height should be higher than any obstacle in the flight path, and therefore if rth is set correctly pre flight, then there would not be any danger in running into what one is filming.

ag0n Posted at 2015-9-14 14:38
Ray, you left a third choice out of your poll.  I would prefer the bird finish the mission and then  ...

I too think there should be better options. A count for POI circuits would work so that you could actually complete a mission in POI. Another option would be brief loss of signal would not trigger an immediate return to home. Extended loss of signal greater than 30 seconds for example triggers an immediate RTH.

rayrokni Posted at 2015-9-15 03:27
my opinion is yes it should go home at any point rc signal is lost

Agreed, go home.....ET go home. (Damn, should had named my bird ET)

I agree with you Ray. it should go home at any point rc signal is lost

I will bring this up at my next team meeting. Maybe we can get it changed.


Dave

DJI-Dave Posted at 2015-9-15 12:31
I agree with you Ray. it should go home at any point rc signal is lost

I will bring this up at my n ...

yayyyy. Thank you for at least considering a suggestion.

mostxclent Posted at 2015-9-15 10:18
I too think there should be better options. A count for POI circuits would work so that you could  ...

that is a good idea too!!

Yep, similar to what I was posting about on Saturday.
http://forum.dji.com/thread-30961-1-1.html

This "feature" of not following RTH rules when in intelligent navigation has been passed over to DJI as feedback and its what many have voiced an opinion on. Hopefully at a minimum, a choice will be given to the user in the future of what the P3 should do when it loses contact with the P3..

Oh and just to be clear on what happens. When a critical battery is reached it WILL land and there is nothing you can do about it ( regardless if you have water, sand, snow or old grannies and children below it ).. Just so Ray can avoid risking damage to his P3 testing it

rayrokni Posted at 2015-9-14 15:37
off course, that is why it is very important to know the whole area where one is flying. i encoura ...

To make sure I know the terrain I put together a little GIS application it will use aerial photography and NGS topographic quadrangle maps.   You can check the contour intervals for your home point elevation and also the terrain you are flying over.  If you start out in a valley type of area then might be entering a value too low.  For instance you might enter 100' as failsafe (just example) but there is a hilly area over part of the area you are flying that is 40' higher than your home point.  You thought 100' was safe to fly for all the trees in your area.  But that darn hill!  See it here.

sploodge Posted at 2015-9-15 18:14
This "feature" of not following RTH rules when in intelligent navigation has been passed over to DJI ...

Thanks for the info, in that case I won't be doing the test then.

Rigworker Posted at 2015-9-14 16:43
Ray, I did mean RC signal loss as you were discussing in your original post. I think RTH would be t ...

But if you are in an 'RC signal loss' situation you can't do an RTH can you?
Bat

DJI-Tim Posted at 2015-9-15 08:03
It would better go home most of the times, except  POI behind the object with RC lost

I agree with Ray that returning to home immediately would be the best in case of RC signal loss.
But in the case when the pilot really knows what he does and is ready to take some risk, there may be an option "Continue mission in case of RC signal loss".
Hovering and descending straight down when the battery is low looks more like a bug than an intended behavior...

rayrokni Posted at 2015-9-14 15:26
interesting part is when it hit low battery level it didnt do the normal thing which is to fly home, it just hovered and then landed once it hit critical. ...

You mean to say that when you reached 'Go home power limit reached' signal the system did not bring the bird back after 10 seconds.
If so that is bad.
Bat

this imput from raykoni must merit a 5 STAR RATING from all of us sterling piece of fault testing

capbat Posted at 2015-9-15 22:11
But if you are in an 'RC signal loss' situation you can't do an RTH can you?
Bat

You cant, but the p3 initiates rth automatically. Not the case in ioc poi mode.

capbat Posted at 2015-9-15 22:16
You mean to say that when you reached 'Go home power limit reached' signal the system did not brin ...

Correct, it just will keep circling til critical battery level is reached and then it lands. Dji are aware and am pretty sure they will make changes

pi-inthesky@hot Posted at 2015-9-15 23:04
this imput from raykoni must merit a 5 STAR RATING from all of us sterling piece of fault testing

Thank you. But I test all the different aspects and see if there is a failure point. I don't want it dropping on someone or something and then cry about it to DJI, rather find out and share the info before hand

DJI-Dave Posted at 2015-9-14 22:31
I agree with you Ray. it should go home at any point rc signal is lost

I will bring this up at my n ...

Sweet! Thanks for your help!

DJI-Dave Posted at 2015-9-15 12:31
I agree with you Ray. it should go home at any point rc signal is lost

I will bring this up at my n ...

now if i could only get ed to propose at least a warning CSC sticker on the RC!

I tested all falilsafe options and it was fed back to DJI by my self  that its not good the way it behaves on loss of signal,there was a LOT of talk over this on RCG on launch day, so far no response from DJI R&D sadly

In All modes it should RTH on loss of signal, on WP yes let it complete the mission then if no signal then RTH

POI should either Delay say 1m then RTH to allow it to go around and recover signal or RTH after one complete revolution of the subject.

if I had it my way it would RTH even if in the middle of waypoints when the battery reaches 30% or whatever you have it set to.  Signal loss should not trigger anything.

DJI-Dave Posted at 2015-9-14 23:31
I agree with you Ray. it should go home at any point rc signal is lost

I will bring this up at my n ...

Looking at the manual and quick start guide, it states that once you are in F-Mode Return To Home is not available.   So once you get up in the air and click that switch to F-Mode (as I read it) you are without Return to Home.  So while you are out setting your Way points and not actually flying the mission yet you are vulnerable?   This part is  confusing me because as you are setting way points you have not yet uploaded your data to the aircraft so it won't know if you said "hover" , "return to Home" etc.   

My worry here is what happens if you are in the middle of setting way points and you lose signal?  According to the manual we don't have RTH see attached image of portion of quick start manual.

Sir Edward K Posted at 2015-9-16 09:26
Looking at the manual and quick start guide, it states that once you are in F-Mode Return To Home i ...

That is a concern. I was going to say you could just switch out of F-mode. But you can't if you have no connection

DJI-Dave Posted at 2015-9-16 11:33
That is a concern. I was going to say you could just switch out of F-mode. But you can't if you hav ...

I guess my confusion was what would happen if signal loss before mission started would it return to home for the failsafe?

Sir Edward K Posted at 2015-9-16 09:37
I guess my confusion was what would happen if signal loss before mission started would it return t ...

I will look in this and get back to you guys here.

capbat Posted at 2015-9-15 08:11
But if you are in an 'RC signal loss' situation you can't do an RTH can you?
Bat

If you are in an RC signal loss the RTH is automatic.

Rigworker Posted at 2015-9-16 19:57
If you are in an RC signal loss the RTH is automatic.

Try that in the middle of a way point mission.   Or POI mission  F Mode does not have automatic RTH on Signal Loss see manual    see the following threads:

New F Modes and RTH

Test Results for Signal Loss with new firmware

Sir Edward K Posted at 2015-9-17 06:34
Try that in the middle of a way point mission.   Or POI mission  F Mode does not have automatic RT ...

Right, i forgot about the waypoint and POI missions and loss of signal. Not automatic in those cases.

Couldn't vote (need an "Other" in the Poll)

My thoughts on the POI and RTH feature.
in POI, the P3 should know where it started it's POI Tour.  If the P3 achieves a full circle and arrives at it's initial location  but has no signal, it should RTH.  In theory, if you are flying around a building or other structure (Let's take Devil's Tower for Example) and lose signal, the P3 should continue on it's POI Tour until it gets back to it's starting position at which point it should have regained connectivity.  If there is no connectivity at that point, it should Return to home.  Theory being that you were in direct line of site of the P3 when it began the POI tour around the object, you should still be there when it gets back to the starting point unless there is a problem, then it should Return home.  If the P3 regains Connectivity as it reaches it's starting position, it should continue on the POI Tour and should do this "loss of signal check" every time it gets to it's starting position.

~SB

Regarding the POI, I think the choice of maintaining its circle in a fair compromise. You can a circle for example and the flight would take the P3 along a course where you would lose the signal momentarily because of the distance or objects blocking the reception, and you would regain the signal as the circle completes and the aircraft is getting closer to the RC again. I feel that most lost of the no signal would fit in that scenario. It is in some ways a return home situation except it's following a circle. The thing that puzzles me though is when you program you POI there a return home altitude reminder, if it was put there that would mean that it can be triggered in some situations, but how? Maybe only triggered by the battery alarm ?

Good afternoon,

Many thanks to you guys, who used you own equipment to test these issues out.

Could somebody please confirm that the Phantom 3, RTH failsafe mode (lost RC signal), also while in F-mode (eg. POI, waypoint etc.), will now have the plane RTH after 3 seconds of RC signal loss?? Many thanks.

Cheers,
Claus

I would say - keep it as it is or let the user choose.

Flying around a building is not possible any more when you activate RTH when RC lost (in waypoint modes)

@Yeager, in waypoints modes it will finish the mission - also with RC lost. (fine for me ;-)

yep, i'm all for continuing the waypoint mission with or without RC connection. I've flown several missions deliberately and lost RC connection. It just continues the mission and comes back to the final waypoint.

Battery failure is a different scenario than just losing RC because of distance or objects.

I've not played with POI on it's own so can't comment on the crazy continuous circling. Not good in my opinion.

Thanks for making us aware of this, it's good to be aware of these caveats so we can fly accordingly and hopefully avoid such situations, or be ready to deal with them accordingly. RTH would get my vote.