Crash, suspicious of battery

Juan Crane · Dec 30, 2015

So my inspire shut down in the air and fell from 60 meters, I had almost 100 successful flights, all my 5 batteries have almost 20 flights. I have cycled them as required by the app.
I am very suspicious of a battery failure as the cause of this crash and I am wondering what their life expectancy is. I just purchased a new inspire 1 pro as a replacement while the other gets fixed but I am a little worried about using the "old" batteries. I have logged up to 200 flights on some of my other lipos!

James Cole · Dec 30, 2015

Do you have the log file? we can tell you by that.

Juan Crane · Dec 30, 2015

Yes I do, at the office though.

James Cole · Dec 30, 2015

What firmware are you at?

Did you take off with a full battery?

What was the ambient temp?

Juan Crane · Dec 30, 2015

Firmware was 1.4.0.10
It was wam outside, definitely not cold.
Took off on a full Battery charged about an hour before flight.

Juan Crane · Dec 30, 2015

At 28 percent it just dropped from the sky

James Cole · Dec 30, 2015

Strange...we need the logs Juan...

Juan Crane · Dec 30, 2015

I'll send them to you tomorrow, where to?

The Editor · Dec 30, 2015

Juan Crane said:
At 28 percent it just dropped from the sky

Were you on a hard climb out at the time or flying aggressively?

Juan Crane · Dec 30, 2015

I was doing a pull out shot, flying backwards fast while climbing slowly

The Editor · Dec 30, 2015

Juan Crane said:
I was doing a pull out shot, flying backwards fast while climbing slowly

At 28% left in the pack and performing a full stick maneuver you could run the risk of the pack voltage dropping to low voltage cut off.
I would not be attempting fast/aggressive style flying at those depletion levels.
What do you normally run your packs down to before you land?

James Cole · Dec 30, 2015

Juan Crane said:
I'll send them to you tomorrow, where to?

You can post them here via attachment so that we can tell you accurately what happened, If I miss something I am sure someone else wont.

Juan Crane · Dec 30, 2015

I have my alarm set to 35 and normally land at 30, this time I got a little carried away.

Juan Crane · Dec 30, 2015

James Cole said:
You can post them here via attachment so that we can tell you accurately what happened, If I miss something I am sure someone else wont.

Got it! Thanks

lrwskyfilms · Dec 31, 2015

The Editor said:
At 28% left in the pack and performing a full stick maneuver you could run the risk of the pack voltage dropping to low voltage cut off.

Sorry for your lost, as @The Editor said. I suppose the latest FW is help stop this happening. Hope you get it sorted.

xahhax · Dec 31, 2015

Yeah pulling out too many amps on a 28% battery is not a good idea imho...
If not cut off by the software, you could run a lipo fire and it is not necessarily better than the bird dropping from the sky.

Juan Crane · Dec 31, 2015

James Cole said:
Strange...we need the logs Juan...

Ok here is the download link for the log file.

FLY352.DAT

Let me know what you find!

James Cole · Dec 31, 2015

Juan Crane said:
Ok here is the download link for the log file.

FLY352.DAT

Let me know what you find!

Juan I am not so good at checking out a .Dat file...

Can you get us the .txt file of the flight.... please check how to get it using IOS or Android, your file is actually inside the device you use for telemetry under "flight records"

RotoRanger · Jan 4, 2016

Juan Crane said:
Ok here is the download link for the log file.

FLY352.DAT

Let me know what you find!

Juan,
I've attached a screen shot of the flight map along with a velocity and altitude plot. I was able to generate a .csv file which shows the actual data from the flight recorder but it is too large to upload. If you PM me with your email address, I can send it to you. This .csv file shows you the actual data from the flight recorder. From my reading, your recording appears to end abruptly at altitude indicating a total power loss of some kind. I don't know if the Inspire's battery depletion algorithms provide residual power to the recorder or not even when the ESCs and motors are shut down, but it appears as though power was suddenly interrupted to the entire aircraft power bus. I hope this helps.