Labroides
Captain
Flight distance : 9991457 ft
Australia
Offline
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My drone flew away from my home point and I tried to bring it back while auto landing started and it crashed into water with 8% battery left.
The reason it flew away from home was that you pulled the right stick down, flying the drone further away (twice!!)
I have contacted DJI support but they said it was pilot error. I think I made some mistakes but could DJI have done better?
Looking at the flight data, I see why DJI say it was pilot error.
There were more than a few mistakes that prevented you from what should have been a simple task of bringing the drone back home.
Here's a more detailed account of what the data shows.
There are lots of ways to foul up and you have to understand what they are and make sure that none are going to happen during your flight.
An important thing when flying over water is to get the drone home with a comfortable battery safety marging just to allow for unexpected issues.
The drone will recommend heading home when the battery level is getting close to the minimum needed for the return flight.
If you haven't already started for home by then, you need to take the hint and RTH.
When the battery reaches Critical Low Voltage level (around 10%), the drone will give up and commence autolanding.
If flying over water, you need to avoid this and be home before the battery reaches 10%.
If you've fouled up and are still out over the water when autolanding starts, you must head for land with urgency.
Your drone started to RTH at 16:13.2 with the battery at 22% and home 534 ft away.
In RTH, that would be a short 13 second flight.
It would have been a quick and easy manual flight home.
But you used the automated RTH feature and had the RTH height set unnecessarily high at 400 ft so the drone would have to climb al the way to 400 ft before it would commence the flight home.
When it was around half way up to RTH height, you cancelled the RTH at 16:24 with battery at 20%.
Instead of taking over and manually bringing the drone home (would have only taken 13 seconds), you left it hovering for 34 seconds (battery down to 18%), initiated RTH and the drone started using battery to climb to 400 ft and 30 seconds later the drone was almost home and 400 feet up with the battery at 15%.
At 17:28,5 with the battery at 15%, instead of bringing it down and landing, you pulled the right stick down fully, flying the drone backwards till it was 450 ft out over the water (still only a 10 sec flight back), then started flying back towards home for a short distance.
At 17:50 (13%) you started flying backwards again taking the drone from 282 ft from home to 581 ft when things got serious at 18:00 when the drone reached Critical Low Voltage and started to autoland from 390 feet.
You still had a chance to bring it back while it descended, (it would have only taken 15 sec) but you left it autolanding for much of the 55 seconds it took to come down into the water.
There's nothing wrong with flying over water .....
But it's an unforgiving environment where one mistake could easily mean that you go home minus your drone.
So you have to be on top of your game when flying out on the water.
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