My Song - lost in transit

Re: The loss of a beautiful superyacht

lw395 said:
Lots of wild speculation and opinons in this thread from people who've probably never designed a structure in their lives.
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Yrs I agree but there are some on here that have designed structures and have or proper qualifications and experience.
 
Re: The loss of a beautiful superyacht

My colleagues and I operate ships of the same size and type as the Brattinsborg, as well as larger ones and semi-subs. We don’t carry yachts but we do move large and delicate carbon fibre structures from time to time. I am speculating, certainly, but my speculations are informed by some knowledge.

Since nobody was hurt, there is no reason for a public investigation and so there is no reason for “the facts” to ever “come out”.

Speculation is all you will ever get.
 
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Re: The loss of a beautiful superyacht

As someone who has taught structural engineering and stress analysis for 30+ years, I'd say that (a) the cradle may well be OK but (b) the stresses in those lashings don't bear thinking about.
 
Re: The loss of a beautiful superyacht

JumbleDuck said:
As someone who has taught structural engineering and stress analysis for 30+ years, I'd say that (a) the cradle may well be OK but (b) the stresses in those lashings don't bear thinking about.
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We don't know that the lashings as seen in the photo are how it crossed the Atlantic.

I wonder if it's a bit like the issue of tying a dinghy to a road trailer, where the problem some people don't appreciate is that the dinghy is far more rigid than the trailer?
 
Re: The loss of a beautiful superyacht

lw395 said:
We don't know that the lashings as seen in the photo are how it crossed the Atlantic.
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Yes, that's a fair point. I amend my commend to "the stresses in those lashings wouldn't bear thinking about."

I wonder if it's a bit like the issue of tying a dinghy to a road trailer, where the problem some people don't appreciate is that the dinghy is far more rigid than the trailer?
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Not the case for the last one I towed, which was a bare grp hull with no gunwale, but also an interesting point. I'd be more worried about the forces needed in particular for rolling and pitching, and I'd be thinking about the strength of the stays used for the mast alone ...
 
Re: The loss of a beautiful superyacht

The mast probably doesn't weigh very much and will be well supported by its own rigging.
The CofG of the whole thing is not going to be be all that high.
These boats are designed to be supported by cradles and transported.
OTOH, racing machines built down to minimum weight sometimes break.
And things fall off the decks of ships in storms every day.
A lot of ifs and maybes?
If only the ship had avoided the weather...

I guess that's why we've had a marine insurance industry for 300 years....
 
Re: The loss of a beautiful superyacht

lw395 said:
The mast probably doesn't weigh very much and will be well supported by its own rigging.
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Weight is not the issue as much as moment of inertia. Just balancing something upright requires little force, but swinging it around is a whole different matter. As I am sure you know, of course.

The CofG of the whole thing is not going to be be all that high.
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It's a 35 tonne keel on a 100 tonne boat, isn't it, so the Cof G is probably about two third of the way up the keel, ish. That's still quite a moment of inertia.

These boats are designed to be supported by cradles and transported.
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I'll take your word on that, but I'll also bet that "properly strapped down" comes into the spec somewhere ...
 
Re: The loss of a beautiful superyacht

The yacht and her cradle crossed the Atlantic aboard the Brattingsborg with no reported issues. The cradle failed and the yacht was lost on passage to Genoa, after a call at Palma.

If - and yes, I am speculating - some cargo was discharged at Palma, then the GM of the Brattingsborg will have changed and it is more than likely that she will have become stiffer as top weight was removed. The loads on the cradle and on its lashings will have increased accordingly. If a full lashing load calculation was carried out at the start, this should have been re-run for the new stability condition after part discharge. If this were not done, the increased lashing loads would pass unnoticed.

https://en.wikipedia.org/wiki/Metacentric_height
 
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Re: The loss of a beautiful superyacht

After what happened with My Song I am sure that all super yacht Insurers will now be very wary when it comes to insuring big yachts for transport as deck cargo on ships.
And I wouldn't be surprised if they insist on ground rules such as 'big' yachts have to be transported in dockships rather than on the hatch covers of general cargo ships.
 
Re: The loss of a beautiful superyacht

TQA said:
Toast

View attachment 78219
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