Nigel_
Second Officer
Flight distance : 388642 ft
United Kingdom
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Drone2621 Posted at 2017-4-14 00:14
Thanks for the adivce Nigel
Regarding the light i have to disagree i could see for miles and no need for lights any where . I did consider this before the flight . Have a look at the clip from the flight i think the light should not be a problem . I checked my logs and got no warning for lighting
There is no exposure information in that video so I can't tell what the light level actually was. From the lack of colour and contrast I guessed in my first response that it was around sunset, that is still what I see and you have confirmed that you were within 15 minutes of a London sunset. (Was that the start of the flight or the time of the accident?)
Note that the obstacle avoidance cameras are the little ones on the legs, not the big one that this video is from, they are not as sensitive and need more light to operate well. Even if there is enough light, they are monochrome cameras that need good contrast to detect distance to objects and this video does not have much contrast. It does appear that it initially did see the building and put the brakes on, but then maybe couldn't visualise the distance to the wall when it was close up and could only see a bit of plain wall in front of it.
As I said earlier, you would not be the first person to have an avoidance failure near sunset.
There is no harm in following a warrantee claim. With the aircraft log DJI will be able to see what was happening with the obstacle avoidance sensors and give the correct analysis. Maybe there was a fault, but I am expecting that they will diagnose low light level and it will turn into an insurance claim instead of a warrantee claim. Ultimately, they are obstacle avoidance sensors, not guaranteed crash prevention sensors, they have saved many aircraft and it only takes one successful avoidance for them to pay for themselves. Flying around a building site I would definitely want them, and the vision positioning sensors that you wouldn't have on a P3, but you need to understand that their vision isn't perfect and just like humans they will sometimes make mistakes in poor viewing conditions and will not be able to see at all at night. There was a thread a few weeks ago where someone was complaining about them not working and it turned out to be completely dark!
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