MILLIONAIRE SUPERYACHT: WHY SHIPS SINK
Discussion
On BBC 2 now if anyone is interested.
During intense storms on 19 August 2024, the 54m superyacht Bayesian mysteriously sinks off the coast of Sicily. Seven people onboard tragically perish. As search and rescue teams scour the coast for survivors, questions begin to be asked. Why did a multi-million-pound superyacht sink when others nearby didn’t? Could its record-breaking mast have made it more vulnerable to strong winds? This film forensically examines what went wrong and asks whether more needs to be done to keep ships safe at sea. Eyewitnesses, first responders, a former captain of the Bayesian and a retired MAIB principal investigator detail what happened.
During intense storms on 19 August 2024, the 54m superyacht Bayesian mysteriously sinks off the coast of Sicily. Seven people onboard tragically perish. As search and rescue teams scour the coast for survivors, questions begin to be asked. Why did a multi-million-pound superyacht sink when others nearby didn’t? Could its record-breaking mast have made it more vulnerable to strong winds? This film forensically examines what went wrong and asks whether more needs to be done to keep ships safe at sea. Eyewitnesses, first responders, a former captain of the Bayesian and a retired MAIB principal investigator detail what happened.
dukeboy749r said:
Caught it part way through and have made a mental note to watch it on iplayer.
Was it any good?
It was interesting to me as I’d never really followed the aftermath too closely. Had some interesting technical details on the boat, an ex MAIB investigator, and meteorologist to explain the freak weather conditions at the time.Was it any good?
I’m guessing a lot is already known to many on here, but for me it gave a good overview.
I ended up watching this and did find it interesting, though it felt as if it might have been better to wait until the final report and court proceedings are finished to draw more conclusions. Maybe there will be a follow-up. I don't remember hearing anything about the cruise ship that was having difficulties in the Norway area due to lack of oil in the generators, but it might not have made it to the news as they got it all going again before running aground.
Arrivalist said:
dukeboy749r said:
Caught it part way through and have made a mental note to watch it on iplayer.
Was it any good?
It was interesting to me as I’d never really followed the aftermath too closely. Had some interesting technical details on the boat, an ex MAIB investigator, and meteorologist to explain the freak weather conditions at the time.
I’m guessing a lot is already known to many on here, but for me it gave a good overview.
Many thanks!Caught it part way through and have made a mental note to watch it on iplayer.
Was it any good?
It was interesting to me as I’d never really followed the aftermath too closely. Had some interesting technical details on the boat, an ex MAIB investigator, and meteorologist to explain the freak weather conditions at the time.
I’m guessing a lot is already known to many on here, but for me it gave a good overview.
Arrivalist said:
I m certainly not doing a liveaboard in Egypt!
I guess the answer to this is in the programme?Less stringent rule keeping, (I presume) and a habit of 'losing' divers?
Haven’t watched the programme, but the boat had:
1) World’s tallest yacht mast.
2) Lifting keel….
Now I’m no yacht designer, but common sense say’s OK have one, OR the other, but it’s not a good idea to have both?
That’s before getting into skipper/crew decisions, forecast, was the side door left open, freak wind etc.
1) World’s tallest yacht mast.
2) Lifting keel….
Now I’m no yacht designer, but common sense say’s OK have one, OR the other, but it’s not a good idea to have both?
That’s before getting into skipper/crew decisions, forecast, was the side door left open, freak wind etc.
StuntCock said:
Haven t watched the programme, but the boat had:
1) World s tallest yacht mast.
2) Lifting keel .
Now I m no yacht designer, but common sense say s OK have one, OR the other, but it s not a good idea to have both?
That s before getting into skipper/crew decisions, forecast, was the side door left open, freak wind etc.
That combination should not be an issue if designed correctly. The lowered keel is designed to match fully deployed sails. The heeling moment from a bare mast will be lower and the raised keel still places ballast at the lowest point in the hull.1) World s tallest yacht mast.
2) Lifting keel .
Now I m no yacht designer, but common sense say s OK have one, OR the other, but it s not a good idea to have both?
That s before getting into skipper/crew decisions, forecast, was the side door left open, freak wind etc.
I am not saying it was designed correctly on this yacht, I am just talking generalities.
StuntCock said:
Haven t watched the programme, but the boat had:
1) World s tallest yacht mast.
2) Lifting keel .
Now I m no yacht designer, but common sense say s OK have one, OR the other, but it s not a good idea to have both?
That s before getting into skipper/crew decisions, forecast, was the side door left open, freak wind etc.
There was some talk of the side door being left open, photos taken by passengers on the nearby Sir Robert Baden Powell showed that it was closed, though I imagine it could have been opened after they passed. The other thing mentioned was taking on water through vents into the engine room and further forward.1) World s tallest yacht mast.
2) Lifting keel .
Now I m no yacht designer, but common sense say s OK have one, OR the other, but it s not a good idea to have both?
That s before getting into skipper/crew decisions, forecast, was the side door left open, freak wind etc.
One of the interesting things about the programme was discussion of this kind of intricate detail that goes into the designing and operating of this sort of vessel.
dukeboy749r said:
Arrivalist said:
I m certainly not doing a liveaboard in Egypt!
I guess the answer to this is in the programme?Less stringent rule keeping, (I presume) and a habit of 'losing' divers?
Scrump said:
StuntCock said:
Haven t watched the programme, but the boat had:
1) World s tallest yacht mast.
2) Lifting keel .
Now I m no yacht designer, but common sense say s OK have one, OR the other, but it s not a good idea to have both?
That s before getting into skipper/crew decisions, forecast, was the side door left open, freak wind etc.
That combination should not be an issue if designed correctly. The lowered keel is designed to match fully deployed sails. The heeling moment from a bare mast will be lower and the raised keel still places ballast at the lowest point in the hull.1) World s tallest yacht mast.
2) Lifting keel .
Now I m no yacht designer, but common sense say s OK have one, OR the other, but it s not a good idea to have both?
That s before getting into skipper/crew decisions, forecast, was the side door left open, freak wind etc.
I am not saying it was designed correctly on this yacht, I am just talking generalities.
Outstanding points from BBC (MAIB?) are:
Bayesian had an AVS of just 70 degrees keel up. Which is bugger all. Most ocean going yachts are getting on for double that at 120 degrees plus.
72mph wind would put her past her AVS under bare poles. (a lot but very possible)
The kitchen and engine vents submerge at 35 to 40 degrees causing rapid flooding. Which on a sailing yacht really isn’t much at all.
What is AVS? I'm getting Address Verification Service, Animal and Veterinary Science, Adaptive Voltage Scaling, Autonomous Vehicle System, American Vacuum Society, Anti-Vibration System, Applied Vegetation Science and many more but nothing that suits a boat: https://www.acronymfinder.com/AVS.html
So anyway, basically it went down the same way as the Mary Rose and the Wasa - bad design: rolled over, water went in the holes. Except the first two had a bit of an excuse because they didn't have computers to design them.
So anyway, basically it went down the same way as the Mary Rose and the Wasa - bad design: rolled over, water went in the holes. Except the first two had a bit of an excuse because they didn't have computers to design them.
Simpo Two said:
hidetheelephants said:
Angle of vanishing stability
Thanks. 'Maximum roll angle' in other words - much clearer!Basically it’s the angle at which even if all heeling moments were removed you are still going to end up upside down. Heeling moments in this case would obviously be the wind but also the water flooding in through the vents.
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