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Old January 9th, 2015, 05:34 AM   #1
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DJI phantom 2 when the battery runs out

Good thing the water was not too deep :)
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Old January 9th, 2015, 05:51 AM   #2
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Re: DJI phantom 2 when the battery runs out

That's what happens when you don't use a timer or keep an eye on the warning light -the Phantom goes into low voltage auto land. Great save though :-0

Roger
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Old January 9th, 2015, 06:34 AM   #3
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Re: DJI phantom 2 when the battery runs out

If you read on the RC forums that is also that happens when you update your firmware to the latest versions. There is something seriously wrong with the battery monitoring in the newest versions that has led to a number of autoland events with negative outcomes. Phantoms have been going into autoland when just seconds before showing more than 50% battery.
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Old January 9th, 2015, 06:41 AM   #4
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Re: DJI phantom 2 when the battery runs out

Great save though ! ha

I read that you can program a safe landing zone with your phone within seconds ? So is it really an issue.

I'm considering one of these soon just for fun. I highly doubt i'll have the time or energy to pull it out at an event unless I have additional help with me.
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Old January 9th, 2015, 06:53 AM   #5
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Re: DJI phantom 2 when the battery runs out

The issue is when it trips into autoland it descends to land where ever it is. Your selected home location doesn't matter. It stops and lands as soon as the critical battery warning is reached. You loose control of it in GPS mode. You can get some control back in ATT mode. You can't keep it from descending but you can input some directional control.

The main problem is that phantoms have been tripping into autoland long before the battery is truly depleted. If that happens you need to be in NAZA mode and be ready to go to ATT mode so you can at least guide it around anything it could be descending into.
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Old January 9th, 2015, 07:16 AM   #6
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Re: DJI phantom 2 when the battery runs out

Great video and truly heroic save.

I also had an early auto land problem with my Phantom 2 a month or so back and in trying to counteract and steer the craft away from a clifftop inadvertently caused the motors to stop and the drone to fall out of the sky.

I heard the sound from about 300 metres away and immediately knew I had a big problem.

What I was doing was both steering the craft down and towards me which is also the same signal as stopping the motors. I only worked this out afterwards when I started to analyse what had happened. Initially I had though that the battery had run out of juice but it still had over 40% on it. What broke was the ZenMuse Gimbal and the DJI iOSD mini cable. The actual aircraft has cracks on one of the arms but with a new shell will be OK.

This all happened after I upgraded the firmware. I should have held back and researched whether anyone had had problems. I found out from a more specific DJI Phantom forum that others had had the same problem and also posted my experience.

I don't know what solution to the early land problem is and rather than mend the machine and buy a new gimbal I have bought an Inspire 1. The next time I am offered a firmware update I will see whether there are any problems reported on this and other forums before installing it and I realise that I have learnt a lot from my experience.
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Old January 9th, 2015, 12:42 PM   #7
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Re: DJI phantom 2 when the battery runs out

What's remarkable about that clip is all the other places it could have landed safely it went into the water. Great save!

I had a similar experience to Mark. I was flying a hex in high wind trying to land in a small space. Without any payload the Hex lifted off at about 35% throttle, so it was very light, when I kept lowering the throttle it just powered down and crashed:


This was about four years ago when DJI was telling everyone this could not happen. After more people started reporting similar experiences they told everyone they resolved it in firmware. Of coarse that didn't make me feel much better, the damage was done and they basically blamed it all on the users at the time so I have never purchased another DJI controller.

If you want to prevent auto land, turn off the power management and time your flights.

A note: The video doesn't prove what actually happened, after replacing a boom and a couple of prop I powered up the NAZA, it armed and flew fine. After a couple of flights I replaced the controller and never had this issue again.

Last edited by Chuck Spaulding; January 9th, 2015 at 12:45 PM. Reason: To be fair to DJI
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Old January 9th, 2015, 05:30 PM   #8
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Re: DJI phantom 2 when the battery runs out

I didn't think there was much different between the main NAZA functions of the Phantom 1 & 2, and having had over 125 flights with my Phantom 1, I have never had an auto land caused by a low battery. I have used the return to home function on two occasions when it was too far away to see the orientation. That worked faultlessly both times, bringing it back to about 6ft from the take off point automatically.

I do run a ground timer to keep a visual and audible warning of battery life as I like to keep within the limits at all times. You can also set up a perimeter area which the quad will automatically stay within. Flying over water though, I would also allow extra return time just in case of head winds etc.

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Old January 10th, 2015, 09:14 AM   #9
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Re: DJI phantom 2 when the battery runs out

Unlikely we'll see this in DJI's next showreel? I'll refrain from updated my firmware for a while then.
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Old January 10th, 2015, 10:25 AM   #10
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Re: DJI phantom 2 when the battery runs out

Quote:
Originally Posted by Michael Bradshaw View Post
Unlikely we'll see this in DJI's next showreel? I'll refrain from updated my firmware for a while then.
From what I can gather the latest firmware for the Intelligent Battery is to prevent early autolandings rather than cause them. One issue was where a battey if left fully charged (never a good idea) tended to swell and perhaps become damaged. The new firmware for the batteries both has better balancing to improve the lifetime of the batterry. But also auto discharges to 50% storage state if the battery is not powered up for 10 days. There is also a newer version 2 of these intelligent batteries as well.

I have been flying my P2 for about couple months now without issue and do hope that any battery issues are pilot error rather than built in!

cheers

bill
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Old January 10th, 2015, 10:46 AM   #11
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Re: DJI phantom 2 when the battery runs out

Do those autorotate or just fall out of the sky if there is a total battery failure?
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Old January 10th, 2015, 10:48 AM   #12
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Re: DJI phantom 2 when the battery runs out

Autorotation isn't possible on a craft such as this with fixed pitch rotors. It falls like a rock.
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Old January 10th, 2015, 06:55 PM   #13
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Re: DJI phantom 2 when the battery runs out

A nice edit of the original

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Old January 11th, 2015, 11:20 AM   #14
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Re: DJI phantom 2 when the battery runs out

Noa, was that you that made the miraculous reception?
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Old January 11th, 2015, 01:16 PM   #15
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Re: DJI phantom 2 when the battery runs out

No! :) I probably should have mentioned that, I just came across that video.
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