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Old 28-06-2013, 13:27   #1
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Can a Mono Hulled Sailboat Right Itself

If a mono hulled sailboat has a sealed cabin when it is overturned. Will it right itself?
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Old 28-06-2013, 13:29   #2
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re: Can a Mono Hulled Sailboat Right Itself

you mean like this???
Spirit of Canada Rollover Test - YouTube
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Old 28-06-2013, 13:34   #3
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re: Can a Mono Hulled Sailboat Right Itself

However, most cruising sailboats do not have canting keels.
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Old 28-06-2013, 13:49   #4
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re: Can a Mono Hulled Sailboat Right Itself

Someone did a video inside a test boat as it was rolled a few years back, it wasn't pretty inside.

Everything not tied down went flying, I suspect anyone inside would be hurt from the experience.
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Old 28-06-2013, 13:59   #5
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re: Can a Mono Hulled Sailboat Right Itself

Quote:
Originally Posted by lautzy View Post
If a mono hulled sailboat has a sealed cabin when it is overturned. Will it right itself?
I would thank so,may even make it accelerate the righting motion ..?
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Old 28-06-2013, 14:02   #6
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re: Can a Mono Hulled Sailboat Right Itself

maybe, but in any case the rig will be gone, and then the keel offers a lovely pendulum effect, unbalanced by the rig that is no longer there.
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Old 28-06-2013, 14:04   #7
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re: Can a Mono Hulled Sailboat Right Itself

Yachting Monthly capsize video is here:

Alain
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Old 28-06-2013, 14:09   #8
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re: Can a Mono Hulled Sailboat Right Itself

An afterthought here: nor do most cruising boats have that wide, fairly flat shape from amidships to aft, to encourage reluctance to righting.
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Old 28-06-2013, 14:09   #9
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re: Can a Mono Hulled Sailboat Right Itself

Welcome to the forum Lautzy.

For an ocean going vessel the stability is, or at least should be, such that the inverted stability is very poor and the boat will quickly right itself.

The best guide is the stability curve, which should be available from the designer. Unfortunately the glossy brochures sometimes neglect important bits of information like this.

Without a full stability curve sometimes just the AVS or angle of vanishing stability is listed. This gives a rough guide. AVS is the point between positive and negative stability. (About 125 degrees for this yacht)
Stix is another guide where the stability is reduced to a single number, but the full stability curve gives more information.

The risk of capsize increases as the beam decreases so the consensus is that very high stability is particuarly important in smaller yachts.
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Old 28-06-2013, 14:11   #10
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Re: Can a Mono Hulled Sailboat Right Itself

Quote:
Originally Posted by Hydra View Post
Yachting Monthly capsize video is here:

Alain
That's the one, thanks Alain.
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Old 28-06-2013, 17:42   #11
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Re: Can a Mono Hulled Sailboat Right Itself

As long as it maintains its water tight integrity or at least does fill with water, almost all keel boats will eventually right themselves.
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Old 28-06-2013, 17:45   #12
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Re: Can a Mono Hulled Sailboat Right Itself

And they don't always lose their rigging when they roll over.

Several books mention being able to sail again after a roll over.

kind regards,
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Old 28-06-2013, 18:04   #13
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Re: Can a Mono Hulled Sailboat Right Itself

They almost always do assuming that the keel does not get broken off during the roll. High aspect keels can be a bit vulnerable in a roll. The fact of the matter is that a monohull with a weighted keel has only two positions of ultimate stability if the hull does not break up. They are; on the surface with the keel down and mast up, and on the bottom with the keel down and mast up.
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Old 29-06-2013, 10:10   #14
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Re: Can a Mono Hulled Sailboat Right Itself

Friend of mine was delivering a boat up the USA east coast once when it got rolled. He said when the washing machine action stopped he was standing up and something was hitting him in the head. He grabbed it and it turned out to be the toilet seat.
After a minute or so the washing machine action started again and the boat righted itself.
They were eventually picked up off the boat right before it sank.
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Old 29-06-2013, 13:48   #15
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Generally, monohulls will right themselves. In calm conditions, they can stay upside down with some limited stability. However, in conditions that would causes boat to capsize in the first place, then there would still be enough outside forces acting on the hull to push it beyond its new upside down angle of stability and back upright.
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