ghostlymoron2
Member
It'll be available on the itv catch up channel.
Bayesian.
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Metalicmike
Active member
There never seems to be much discussion about the keel, I can understand them lifting the keel whilst motoring but cannot understand why they wouldn't drop the keel when anchored. It would be interesting to know its effect on the yacht stability in its raised position.
dunedin
Well-known member
Actually the opposite, there has been a LOT of chat about the keel. Clearly it would be expected to be down with sails hoisted - particularly with the enormous spinnakers a boat like that would use in the superyacht regattas. But equally should be designed to be stable enough (within its design envelope) with the keel up when sails down and in harbour or anchored in shallow water.
Apparently it is common practice to lift keel in some super yachts at night, even in deep water, to reduce noise for guests.
In terms of the surprising tendency of the builder to publicly blame the crew for their “unsinkable” boat sinking so fast, it will be interesting to learn what the builder’s operating manual says about keel position overnight, if anything.
Sea Change
Well-known member
I used to have a 33ft boat with a big bronze centreboard. We only ever lowered it when sailing with the wind forward of the beam. In all other instances it would rattle and clonk, which was pretty annoying.
I'd also expect that any lifting keel boat would be designed to have adequate stability with the keel raised. The boat is expected to be able to sail safely with the keel up.
I have no idea whether my experience translates to a much larger boat of course.
davethedog
Active member
I watched the documentary last night and found it very informative but also very very sobering that it could happen to such a vessel.
As for the investigation, due to the publicity etc I am sure it will be very thorough indeed!
As for the investigation, due to the publicity etc I am sure it will be very thorough indeed!
bedouin
Well-known member
To be fair - MAIB are always very thorough indeed. I have no doubt they will do everything possible to understand why it sank in the way it did.
lustyd
Well-known member
I think this assumes incorrectly that seaworthiness would be high on design priorities on a boat primarily designed for drinking in the sunshine. Boats like this need to be seaworthy enough but not overly so as it would spoil the experience. The Kraken video demonstrates this nicely with him implying a raised hatch with sliders would be better than a patio door. Sure, it wouldn’t sink but neither would it leave the dock as nobody would buy or charter such a boat.
Sandy
Well-known member
Why would you need the keel down at anchor?
My only experience with a lifting keel is on a Boreal 47 and it was not needed unless sailing to windward.
While the size of the vessel is smaller than Bayesian the principals are the same.
Seastoke
Well-known member
Is it not to counter balance the heavy mast , when windy.
RunAgroundHard
Well-known member
The weather event was very extreme, hence keel down would have improved stability at anchor in these conditions, keel up reduced stability. It’s pretty simple logic for the incident conditions.
RunAgroundHard
Well-known member
As far as I understand it, from the various discussions post incident, YouTube et cetera, the boat is stable motoring about with its keel up, so countering the mast weight was in place.
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Seastoke
Well-known member
14K478
Well-known member
I’ve been a “customer” of the MAIB twice, in the day job and they are excellent.
I don’t know about you, but looking at the anchorage position, and the possibility of the wind coming on shore, I would have had the plate up.
I don’t know about you, but looking at the anchorage position, and the possibility of the wind coming on shore, I would have had the plate up.
Sandy
Well-known member
Without the design and testing data for the Bayesian nobody can work that out. I am sure the MAIB are having a good look at all the figures, Standard Operating Procedures and the actions of all onboard that night.
Pye_End
Well-known member
A lot of information on this thread: 56m luxury sailing yacht sinks off Sicily, 7 missing
It sounds as though the keel is potentially noisy at anchor. Lots of discussion of stability and downward flooding angles in the thread.
It sounds as though the keel is potentially noisy at anchor. Lots of discussion of stability and downward flooding angles in the thread.
Seastoke
Well-known member
I was asking the question .
laika
Well-known member
Either you’re watching that without a licence or by my calculations you’re paying about £7.50 an episode
Sandy
Well-known member
You only need a TV licence to watch BBC content on the internet live, i.e. at the time of transmission.
capnsensible
Well-known member
The Forum Accident Investigation Board is much quicker at jumping to several conclusions though. Doesn't need any real evidence either.
Tillana
Member
Not for BBC. That's true of other channels, but you can't watch iplayer without a licence
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