Recreating the missing section of IB6830's ADS-B track

Mick West

Staff member
While IB6830 has been conclusivly identified as the "UFO" seen in the IR footage from the Chilean navy, the first few minutes of the video are a bit tricky to match up because the ADS-B data is missing:

6830 is a flight from Santigo to Chile which still runs today:

Departure seems consistent, on runway 17R, so 170°, basically just east of south. A little dogleg to get onto the bottom straight section, then a turn onto the long departure. I suspect this is to give it enough room to climb over the andes.

A typical departure is on 4-jan-2017, this exactly matches the initial climb and turn, although the second turn ends up a bit different.

So it seems reasonable that we can take the 11-Nov-2014 track, and adjust it to be as close as possible as 4-Jan-2017 track, and that will give us something very close to the actual path flown. I'll probably have to do some manual method


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Mick West

Staff member
Attached is a "Local Only" section of the Flightaware data - easier to deal with for time scale and elevation profiles.

The elavation profile looks like this:

The big gap is the missing data. It goes 538 km/h, down to a flat 452 km/h, then jumps to 832 km/h

Altitude from 3194m to 5791m so over 11 steps that's +236.09

The gap starts at 13:48:39 and ends at 13:53:59 (+5m20s, or 320 seconds).

The actual video starts at 13:51:55, and we first see the plane targeted at 13:52:31, with the first image at 13:52:35 where it looks like the plane is already in the last turn. At the end of that IR segment at 13:53:07, the plane is still apparently banking.

When we see the plane again at 13:55:44 it is now level.

It is simplest to assume a constant climb rate and acceleration

Here's a preliminary curve, for ground track only. Puts the plane approx 37 miles from the chopper at closest point (which also seems to be the first contact)



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Mick West

Staff member
After reviewing the departure chart for the ESLAR 3 Departure, I think I had the plane turn too early, and it would have continued more towards the SNO VOR before the turn. Here I've adjusted it so the turn rate is similar to the more recent departure (in white)

Does not make a huge amount of difference, but brings it a little closer to the chopper.

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Mick West

Staff member
And here are several more paths, they all do "straight towards SNO then proceed to TABON"

Our guy is slightly unusual in that he does not go direct to TABON, but has a more northerly heading. The track takes him on the other side of Mt Mercedario (22,000 feet).



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Senior Member.
Our guy is slightly unusual in that he does not go direct to TABON, but has a more northerly heading.
Not unusual for November 2014. Here are the tracks for the previous four days:
Screen Shot 2017-01-13 at 09.23.02.png Screen Shot 2017-01-13 at 09.36.06.png Screen Shot 2017-01-13 at 09.31.52.png Screen Shot 2017-01-13 at 09.28.27.png

Perhaps, the departures have been tightened up lately.

PS All these flights went NW of of Mt Mercedario, like 2014-11-11.
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Mick West

Staff member
Finally got a time-coded track with the estimated section. While this is only an estimate, I think it's fairly close to the actual track. And remember the estimated proportion is only relevant to the first 30 seconds of the video.



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