rollover
- Thread starter gardenshed
- Start date
Aja
Well-known member
Goodness! What would happen if he hadn't lost his mast! /forums/images/graemlins/shocked.gif
Donald
Donald
graham
Well-known member
I wondered that .The mast and sails would put up a lot of resistance to it rolling back upright.
SvenglishTommy
Member
What would happen if he was in the cockpit?
gardenshed
Member
he'd yell to the crane driver to stop lifting
stevebirch2002
New member
Seems really easy in a flat calm, now I may be a bit of a pessimist but dont boats usually roll in really bad weather!
So.... Large swell, gale force winds, mast attached with sails fitted........??????
So.... Large swell, gale force winds, mast attached with sails fitted........??????
Lakesailor
New member
What's he expect if he sails around the world in a very large Laser?
mikefleetwood
Well-known member
As he was only just able to right it without mast/sails, no way could he do it fully rigged. This test is a complete waste of time, unless of course, he has some method to loose the mast, rigging, etc quickly. Explosives?
Bilgediver
Well-known member
As he was only just able to right it without mast/sails, no way could he do it fully rigged. This test is a complete waste of time, unless of course, he has some method to loose the mast, rigging, etc quickly. Explosives?
..............................................................
My thoughts exactly and who was he trying to impress...his insurance company /forums/images/graemlins/smile.gif
..............................................................
My thoughts exactly and who was he trying to impress...his insurance company /forums/images/graemlins/smile.gif
Twister_Ken
Well-known member
Sorry to disagree, but in a seaway bad enough to roll the boat keelside up, the odds are it will help roll it back again without cutting loose the rig, or even the trick canting stuff. Harder to right the boat in a flat calm dock than it would ever be at sea.
jwilson
Well-known member
Quite right. I've BEEN inverted in a boat and sea movement will help righting. Once the keel was canted she came back quickly once heeled about 30 degrees. In conditions that will invert a 60-footer there wiill be more than 30 degrees movement. Also the more water that enters the hull the faster she'll right, as it reduces stability. The real danger is being trapped underwater in the cockpit. If you do manage to release your harness and swim out you then have the danger of being separated from the boat.
mikefleetwood
Well-known member
I'm sure you, and others, are correct about the real-life situation. But doesn't that make the harbour test a bit meaningless?
If I understand the commentary right, it was a requirement of the race organisers that this test was done. Something to do with insurance, I expect.
Surely (and based on other's experience) a better test would be to see what angle of 'tip' would be needed to self-right. It must be possible to compare with conditions that would exist at sea. Presumably if it takes less heel to self-right than it takes to capsize in the first place, then the boat is safe? Actually, I can see flaws in this argument, but there must be a sound principle here somewhere.
If I understand the commentary right, it was a requirement of the race organisers that this test was done. Something to do with insurance, I expect.
Surely (and based on other's experience) a better test would be to see what angle of 'tip' would be needed to self-right. It must be possible to compare with conditions that would exist at sea. Presumably if it takes less heel to self-right than it takes to capsize in the first place, then the boat is safe? Actually, I can see flaws in this argument, but there must be a sound principle here somewhere.
boomerangben
Well-known member
The conditions at sea are hugely complex and I would imagine that most knockdowns are due to breaking waves. I am not sure that we have the techniques to analyse this scenario yet. The best indication would the area between the GZ curve and the x axis which relates to the work done in attaining a given angle of heel. Hopefully these boats require substantially more energy to capsize a boat than it would to right it.
More worrying for me would be the amount of movement in that canting keel as the crane inverted the boat. The boat will never right itself if that thing came off.
More worrying for me would be the amount of movement in that canting keel as the crane inverted the boat. The boat will never right itself if that thing came off.
andy_wilson
New member
The thing is, that yacht must have massive inverted stability, being so wide and having very little cabin underwater when inverted.
andy_wilson
New member
They might add resistance but they won't stop it righting, only slow it down.
It's the weight of the rig that would stop it righting.
It's the weight of the rig that would stop it righting.
Twister_Ken
Well-known member
Didn't half whip over when it came back up, though, didn't it?
Possibility of breaking the crew, there, I reckon.
Possibility of breaking the crew, there, I reckon.
douglas_family
New member
think i agree with Ken anyway he should be more worried about the keel dropping off
richardabeattie
Active member
How about a gas fired airbag at the mast head!
Avocet
Well-known member
I agree that a rough sea MIGHT help to right the boat but how would you know which way to cant the keel in order to take advantage of a wave helping to right you? It didn't seem a particularly quick thing to cant.
