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Old 11-04-2016, 16:03   #166
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Re: Dutch couple found dead, their sailboat found upturned

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Originally Posted by estarzinger View Post
^^ yea, I am a bit surprised GE does not have more resolution - but it is a remote spot and I know they greatly detune the resolution in places like it.
...

But click on one of their pictures and it shows the reef/island that is there: Attachment 122503
The blue blob surprised me because so many places I have viewed with GE have shown what was there. Or so I thought.

All of the photo icons shown in GE should give one a clue, but I know I kinda ignore the photo icons. This is one of the photos from GE that is 46 miles SSE of the island where the boat was bound.

Pretty sure, but I might be wrong, that the house is NOT where GE says it is. Or maybe it is a REALLY nice house boat....

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Old 11-04-2016, 16:19   #167
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Re: Dutch couple found dead, their sailboat found upturned

To the best of my knowledge all the photos on GE come from Panoramio.
When posting to Panoramio it is up to the poster to enter the lat/long of the position from which the photos are taken....( not the lat/Long of the subject) .

Errors of some magnitude are not uncommon.

Note the first response/query here.... Panoramio - Photo of Islotes Fairway y Isla Desolacion
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Old 11-04-2016, 17:46   #168
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Re: Dutch couple found dead, their sailboat found upturned

Yeah, I've noted that on GE for a long time. The photos are pretty useless as a geolocation tool.

Paper and raster charts for me. I use vector graphics for some uses but not in this application.

I would not jump to the conclusion that such world travelers would make that mistake.

A wandering AP? Not monitored closely, fatigue, fell asleep under vane? Lots of possibilities.

Heartbreaking no matter why.
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Old 11-04-2016, 18:45   #169
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Re: Dutch couple found dead, their sailboat found upturned

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Exactly, fatigue failure is caused by cyclic loading and ocurrs faster at higher stresses.
Overload the bolts a few times from grounding reduces the fatigue life by leaving residual stress in the steel, then cyclic loading from wave action can finish it off.
Toughness, or the ability to absorb energy, is needed for a keel / hull to survive an impact.

The comment 'fatigue occurs faster at higher stresses' requires some clarification.

At lower frequencies with longer duration loads then strain is often the primary failure mode. A keel strike is a good example of this type of loading.

For steel, temperature has a significant bearing on the toughness of steel. The titanic suffered catastrophic failure because the glass transition temperature of its hull steel was above the sea temperature. Even welds in high strength steels can be shown to have vastly different properties to the parent metal.

Failure is usually a mix of cyclic loadings. Miners law is one means we can use to understand a failure comprised of a range of loads. A single large impact load can consume a large percentage of the useful life of a steel structure.

When an overload occurs then yielding, deformation and crack propagation become significant.

Corrosion also acts to reduce toughness in varying forms.

Sent from my SM-N900T using Cruisers Sailing Forum mobile app
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Old 13-04-2016, 16:59   #170
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Re: Dutch couple found dead, their sailboat found upturned

Awful news. Condolences to friends and family.
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Old 14-04-2016, 08:16   #171
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Re: Dutch couple found dead, their sailboat found upturned

http://binged.it/1NasAdz

Quote:
Originally Posted by estarzinger View Post
^^ yea, I am a bit surprised GE does not have more resolution - but it is a remote spot and I know they greatly detune the resolution in places like it.

GE - showing just shallow area (at all GE zoom levels): Attachment 122502

But click on one of their pictures and it shows the reef/island that is there: Attachment 122503
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Old 01-05-2016, 13:45   #172
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Re: Dutch couple found dead, their sailboat found upturned

The latest news I have is that the authorities are investigating a possible collision. Nothing more unfortunately.

The remains of Waldy and Ria have been repatriated to Holland.
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Old 01-05-2016, 16:30   #173
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Re: Dutch couple found dead, their sailboat found upturned

Getting an understanding of what happened in this and other accidents is always helpful as a learning tool for the rest of us. Whether it was a grounding or not, this article bears posting again, if it hasn't been already:
How to use vector charts safely
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Old 01-05-2016, 17:03   #174
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Re: Dutch couple found dead, their sailboat found upturned

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The latest news I have is that the authorities are investigating a possible collision. Nothing more unfortunately.

The remains of Waldy and Ria have been repatriated to Holland.
Thanks for the update, I will be interested to see what they find.
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