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Phantom 4 Pro Crash Side Obstacle Avoidande didn't work
5592 28 2016-12-21
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djinayda
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Can This Happen?
2016-12-21
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Geebax
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Yes, it certainly can, and that pilot obviously had no idea what to expect. He mentions testing the 'optical' obstacle avoidance, which is only fitted to the front and rear of the aircraft. The side version uses infrared detection, and despite DJI saying it should be able to detect trees, there have been several reviews showing that is cannotv reliably detect them.
2016-12-21
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hallmark007
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Geebax Posted at 2016-12-21 22:30
Yes, it certainly can, and that pilot obviously had no idea what to expect. He mentions testing the 'optical' obstacle avoidance, which is only fitted to the front and rear of the aircraft. The side version uses infrared detection, and despite DJI saying it should be able to detect trees, there have been several reviews showing that is cannotv reliably detect them.

It clearly says in the manual (Twice) while using Active track avoid branches and power lines .
2016-12-21
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trance728-
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Also the big thing about the side sensors is they are only active in beginner and tripod mode. I didn't watch the video so I don't know who what mode they were in, just speculating.
2016-12-21
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Labroides
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As it says in the manual the side sensors only work in Beginner and Tripod mode.
There are also limitations to the conditions and objects that the object avoidance system will work with.
Check the manual for details.  There is a list on p23.
2016-12-21
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trance728-
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Ok, just watched it, completely pilot error as he wasn't aware of the limitations of the sensors. Active track will not make use of the side sensors.  
2016-12-21
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airspace_media
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This is really important guys. external factors can cause aircraft heading to change while in intelligent flight modes and it could be very risky. This is why VLOS is always best.
I cover the sensors/OA of tap fly here and show you why you can't necessarily trust them every time here
2016-12-21
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trance728-
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I originally liked the idea of sensors until I played with them and realized they screwed my shots up. I guess they're good for beginners, but they have to read the manual for that.
2016-12-21
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djinayda
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hallmark007 Posted at 2016-12-21 18:56
It clearly says in the manual (Twice) while using Active track avoid branches and power lines .

so side sensors only work in tripod mode?
2016-12-21
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djinayda
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hallmark007 Posted at 2016-12-21 18:56
It clearly says in the manual (Twice) while using Active track avoid branches and power lines .

so you think warranty will cover?
2016-12-21
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djinayda
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trance728- Posted at 2016-12-21 20:34
Also the big thing about the side sensors is they are only active in beginner and tripod mode. I didn't watch the video so I don't know who what mode they were in, just speculating.

it wasn't in beginner mode. I didn't know that they only work in beginner mode. Damn. It detected the branch cause you can hear beeping but it didn't stop. So warranty is not going to cover this?
2016-12-21
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Punchbuggy
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airspace_media Posted at 2016-12-22 08:49
This is really important guys. external factors can cause aircraft heading to change while in intelligent flight modes and it could be very risky. This is why VLOS is always best.
I cover the sensors/OA of tap fly here and show you why you can't necessarily trust them every time here
https://www.youtube.com/watch?v=0bKU18489u8

Well done with the video. I was dubious of the use of the paper images initially, but settled in and found it a very good way of communicating the concepts. Thumbs up, and looking forward to the others.
2016-12-21
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hallmark007
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djinayda Posted at 2016-12-22 03:00
it wasn't in beginner mode. I didn't know that they only work in beginner mode. Damn. It detected the branch cause you can hear beeping but it didn't stop. So warranty is not going to cover this?


Warranty would depend on you reading the Manual, so it might not, I think you should talk nicely to dji , in there video advertising they do not explain clearly or not at all exact workings of OA, But are very quick to trump there cause that p4p has alround OA , I would argue the case with them on those grounds and they may come to a deal with you. Good luck..
2016-12-22
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DJI Mindy
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djinayda Posted at 2016-12-22 10:58
so side sensors only work in tripod mode?

Here is the screenshot for your reference. infrared sensing system.png
2016-12-22
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djinayda
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thank you. I appreciate the info. I will try to do that. I sent it yesterday to them. I was trying to get parts cost but DJI doesn't have that on the site.
2016-12-23
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Whitetail UP
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DJI Mindy Posted at 2016-12-22 05:32
Here is the screenshot for your reference.[view_image]

So if the unit is in beginner mode and you have run the same manual flight repeatedly with testing the RTH, then on the last flight the unit shoots up after turning around, pauses shoots up higher in the air again, then decends towards you at a high rate of speed gets within about 10 ft of the landing area stops and shoots back up into overhanging tree branches probably 60 ft up and comes crashing to the ground. Is it my fault??
2016-12-26
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AlaskanTides
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Just watching the video makes me cringe a bit..... hovering that close to a building and a tree for any length of time is asking for trouble.  an unexpected  wind gust can force the drone into the building are the tree ... then you nor the drone sensors will not have time to react.

You also run  the risk of losing GPS... In which case  the aircraft is going to default to Atti and begin to drift.... If you're not prepared to respond,  then thats another oops.

Forget about the sensors on you're drone... Until you start advanced flight(forget they even exist). its important to learn what the sensors do and how and when to shut them off.

However for starters you need to learn to perform a risk assessment and identify all the hazards, then incorporate a failsafe for those hazard's into your flight plan.... thats the most important step of all.

You might have to fly that close to a building are a tree to get the results you want ..... but you will learn tricks and the proper way to do those things over time as you're skills grow...  

Simply put..... you made multiple bad decisions with that flight..... that was pilot error all the way around. However you will learn from it and one day you will look back and realize how silly that video truly was and laugh.

Look to the future and Safe flying ....and do not let it get you down... no one was hurt and you learned allot .
2016-12-26
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Rogen
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I originally liked the idea of sensors until I played with them and realized they screwed my shots up.
2016-12-27
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Abaco305
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DJI Mindy Posted at 2016-12-22 05:32
Here is the screenshot for your reference.[view_image]

Hope that changes in future updates.
2016-12-27
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trance728-
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Abaco305 Posted at 2016-12-27 05:30
Hope that changes in future updates.

It probably won't due to the infrared sensors not being able to work in faster speeds, that's why it's just for those 2 modes.
2016-12-27
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DJI Mindy
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Whitetail UP Posted at 2016-12-27 11:45
So if the unit is in beginner mode and you have run the same manual flight repeatedly with testing the RTH, then on the last flight the unit shoots up after turning around, pauses shoots up higher in the air again, then decends towards you at a high rate of speed gets within about 10 ft of the landing area stops and shoots back up into overhanging tree branches probably 60 ft up and comes crashing to the ground. Is it my fault??

I cannot confirm if this is pilot error. It's better to sent it in.
Our engineers will help to analyse the flight data and let you know what could have caused the issue.
2016-12-27
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djinayda
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AlaskanTides Posted at 2016-12-26 20:37
Just watching the video makes me cringe a bit..... hovering that close to a building and a tree for any length of time is asking for trouble.  an unexpected  wind gust can force the drone into the building are the tree ... then you nor the drone sensors will not have time to react.

You also run  the risk of losing GPS... In which case  the aircraft is going to default to Atti and begin to drift.... If you're not prepared to respond,  then thats another oops.

Thank  You for writing
2016-12-29
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djinayda
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AlaskanTides Posted at 2016-12-26 20:37
Just watching the video makes me cringe a bit..... hovering that close to a building and a tree for any length of time is asking for trouble.  an unexpected  wind gust can force the drone into the building are the tree ... then you nor the drone sensors will not have time to react.

You also run  the risk of losing GPS... In which case  the aircraft is going to default to Atti and begin to drift.... If you're not prepared to respond,  then thats another oops.

Thank  You for writing . Very helpful.
2016-12-29
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djinayda
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Rogen Posted at 2016-12-27 00:45
I originally liked the idea of sensors until I played with them and realized they screwed my shots up.

yeah they actually make the aircraft fly too shaky.
2016-12-29
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Whitetail UP
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DJI Mindy Posted at 2016-12-27 22:15
I cannot confirm if this is pilot error. It's better to sent it in.
Our engineers will help to analyse the flight data and let you know what could have caused the issue.

CAS-381097-C9R8V2

Its on its way to you.
2016-12-29
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fansc8de520c
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Yep. Found that out the hard way.Why in the world would the sensors NOT be active all the time?
2017-8-25
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MrDave
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djinayda Posted at 2016-12-21 18:59
so you think warranty will cover?


No, I doubt the warranty will cover it. However, if you had purchased DJI Care Refresh at a cost of $149.00. Then for a replacement fee of $99.00, on your first occurrence of a destructive crash, you could have had an as new refurbished unit replace your destroyed unit.
2017-8-25
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Eric13
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fansc8de520c Posted at 2017-8-25 21:24
Yep. Found that out the hard way.Why in the world would the sensors NOT be active all the time?

All sensors, esp the infrared sensors on the side, require processing time.
If all sensors would be on all the time the drone wouldn't be able to fly fast.
That's why in sports mode all sensors are being deactivated.
2017-8-26
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m1shootr
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I have no sympathy. I Think the obstacle avoidance system is a way for DJI to make a lot more money. Very clever.  Therefore, I put no reliance on it.
2017-8-28
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