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28-06-2013, 12:27
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#1
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Registered User
Join Date: Aug 2011
Posts: 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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28-06-2013, 12:29
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#2
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Registered User
Join Date: May 2011
Location: "Out There" (mailing Austin TX)
Boat: Lafitte 44
Posts: 418
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re: Can a Mono Hulled Sailboat Right Itself
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28-06-2013, 12:34
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#3
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Moderator
Join Date: Nov 2011
Location: aboard, in Tasmania, Australia
Boat: Sayer 46' Solent rig sloop
Posts: 28,524
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re: Can a Mono Hulled Sailboat Right Itself
However, most cruising sailboats do not have canting keels.
__________________
Who scorns the calm has forgotten the storm.
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28-06-2013, 12:49
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#4
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Registered User
Join Date: Oct 2010
Location: Kansas City, MO
Boat: In the hunt again, unknown
Posts: 1,331
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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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28-06-2013, 12:59
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#5
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Marine Service Provider
Join Date: Aug 2010
Location: north carolina
Boat: command yachtsdouglas32
Posts: 3,113
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re: Can a Mono Hulled Sailboat Right Itself
Quote:
Originally Posted by lautzy
If a mono hulled sailboat has a sealed cabin when it is overturned. Will it right itself?
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I would thank so,may even make it accelerate the righting motion ..?
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28-06-2013, 13:02
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#6
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Registered User
Join Date: Jan 2012
Location: Yuma Island
Posts: 1,579
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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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28-06-2013, 13:04
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#7
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Registered User
Join Date: May 2009
Location: Lorient, Brittany, France
Boat: Gib'Sea 302, 30' - Hydra
Posts: 1,245
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re: Can a Mono Hulled Sailboat Right Itself
Yachting Monthly capsize video is here:
Alain
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28-06-2013, 13:09
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#8
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Moderator
Join Date: Nov 2011
Location: aboard, in Tasmania, Australia
Boat: Sayer 46' Solent rig sloop
Posts: 28,524
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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.
__________________
Who scorns the calm has forgotten the storm.
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28-06-2013, 13:09
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#9
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Moderator
Join Date: Jul 2007
Boat: Bestevaer.
Posts: 14,678
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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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28-06-2013, 13:11
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#10
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Registered User
Join Date: Oct 2010
Location: Kansas City, MO
Boat: In the hunt again, unknown
Posts: 1,331
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Re: Can a Mono Hulled Sailboat Right Itself
Quote:
Originally Posted by Hydra
Yachting Monthly capsize video is here:
Alain
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That's the one, thanks Alain.
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28-06-2013, 16:42
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#11
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Registered User
Join Date: Oct 2010
Location: Punta Gorda, Florida
Boat: Cruisers Yachts 420 Express
Posts: 1,429
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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.
__________________
Tom Jeremiason
Punta Gorda, Florida
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28-06-2013, 16:45
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#12
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Registered User
Join Date: May 2006
Location: Nicholasville, Kentucky
Boat: 15 foot Canoe
Posts: 14,191
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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,
__________________
John
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28-06-2013, 17:04
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#13
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Registered User
Join Date: Apr 2008
Location: Punta Gorda, Fl
Boat: Endeavourcat Sailcat 44
Posts: 3,176
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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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29-06-2013, 09:10
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#14
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Registered User
Join Date: Aug 2009
Location: Bahamas/Florida
Boat: Solaris Sunstar 36' catamaran
Posts: 2,686
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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.
__________________
Sail Fast Live Slow
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29-06-2013, 12:48
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#15
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Registered User
Join Date: Nov 2010
Location: Juneau, AK
Boat: Fortune 30
Posts: 105
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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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