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  #1  
Old April 20th, 2010, 09:58 PM
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gonzo1124 gonzo1124 is offline
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Default Wonder why ships don't tip over?

I do. I remember when ships had heavy, deep keels as ballast. Their draft was so deep they couldn't get into shallow ports, (remember the Cunard France always anchored outside St. Thomas bay?)
It is my understanding that newer ships have more of a flat bottom instead of a pointy keel (and they draft shallower), then huge water holding tanks inside the hull act as ballast. These are controlled by computers to keep the ship level and up.
Anyone knows more about this?
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  #2  
Old April 20th, 2010, 10:00 PM
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Quote:
Originally Posted by gonzo1124 View Post
I do. I remember when ships had heavy, deep keels as ballast. Their draft was so deep they couldn't get into shallow ports, (remember the Cunard France always anchored outside St. Thomas bay?)
It is my understanding that newer ships have more of a flat bottom instead of a pointy keel (and they draft shallower), then huge water holding tanks inside the hull act as ballast. These are controlled by computers to keep the ship level and up.
Anyone knows more about this?
Actually an interesting question, but I don't have an answer.

But I betcha Hank knows the answer? Perhaps ask him.

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  #3  
Old April 20th, 2010, 10:04 PM
dd2355 dd2355 is offline
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But I betcha Hank knows the answer? Perhaps ask him.

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Marginally better than Cynthia McKinney, but still a state embarrassment.

Props to the Admiral. I couldn't have held it together. (see vid @ 1:30)
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  #4  
Old April 20th, 2010, 10:05 PM
Nunu Nunu is offline
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I always assumed they did eventually tip over
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  #5  
Old April 20th, 2010, 10:09 PM
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Fixed ballast, very wide beam, high cube design, water ballast, are all elements that combine to give a very stable ship with a draft of less than 26 feet in most cases. The deepest draft ship running until recently was the old Regal Empress which drew at least 32 feet. She was built in 1953, so that makes sense.

The modern cruise ship is flat bottomed and slab sided. This is why they are very stable.

A very good discussion about this aspect of ship design can be found in George W. Hilton's book Eastland: Legacy of the Titanic. The Eastland capsized in the Chicago River in 1915. It is out of print, but should be available at Amazon or ABE Books.

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Old April 20th, 2010, 10:31 PM
paper1122 paper1122 is offline
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http://www.youtube.com/watch?v=deX7R9RbmX0 - Here is a video of very rough seas with a cruise ship.

I also dug up this realic from the past http://boards.cruisecritic.com/showthread.php?t=154578
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  #7  
Old April 20th, 2010, 11:04 PM
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sarge98 sarge98 is offline
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Quote:
Originally Posted by gonzo1124 View Post
I do. I remember when ships had heavy, deep keels as ballast. Their draft was so deep they couldn't get into shallow ports, (remember the Cunard France always anchored outside St. Thomas bay?)
It is my understanding that newer ships have more of a flat bottom instead of a pointy keel (and they draft shallower), then huge water holding tanks inside the hull act as ballast. These are controlled by computers to keep the ship level and up.
Anyone knows more about this?
If I remember right, believe it's called draft, the Valor goes 28' under the water line, 3 floors plus, and the engines are down there, very heavy..

Last edited by sarge98; April 20th, 2010 at 11:05 PM. Reason: Additional: The picture is me in front of Valor, St Thomas Harbor, Feb 09.
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  #8  
Old April 20th, 2010, 11:07 PM
MrCo9 MrCo9 is offline
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It's happened as recently as 2007.

2007 was NOT a good year.

If your ship does go down, hopefully the crew will be there to help.
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  #9  
Old April 20th, 2010, 11:09 PM
gaunerdog gaunerdog is offline
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Cool Tipping over

Quote:
Originally Posted by gonzo1124 View Post
I do. I remember when ships had heavy, deep keels as ballast. Their draft was so deep they couldn't get into shallow ports, (remember the Cunard France always anchored outside St. Thomas bay?)
It is my understanding that newer ships have more of a flat bottom instead of a pointy keel (and they draft shallower), then huge water holding tanks inside the hull act as ballast. These are controlled by computers to keep the ship level and up.
Anyone knows more about this?
I think it is probably related to the concern that Congressmn Coleman made in a Congressional hearing a few weeks ago about the possibility of Guam tipping over because it would become too populated if we enlarge our military base there. The cruiseships are not islands so I'm sure they wouldn't tip over.
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  #10  
Old April 20th, 2010, 11:17 PM
idlenote idlenote is offline
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This is the real reason, you may wish the question had not been asked:

http://en.wikipedia.org/wiki/Metacentric_height

These ships are built of steel in the bottom, with the engines, fuel and ballast tanks down low to give lots of weight. The superstructures are aluminum and are basically huge empty spaces. Instant stability.
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  #11  
Old April 20th, 2010, 11:20 PM
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Quote:
Originally Posted by paper1122 View Post
http://www.youtube.com/watch?v=deX7R9RbmX0 - Here is a video of very rough seas with a cruise ship.

I also dug up this realic from the past http://boards.cruisecritic.com/showthread.php?t=154578
Wholly crap, half the passengers would have died of heart attack myself included.
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  #12  
Old April 20th, 2010, 11:24 PM
lillian marie lillian marie is offline
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The financial liability would be enormous if modern ships were not built to be stable in even the worst seas. You're safe even in a hurricane as long as you don't get so drunk that you decide to take a nose dive off your balcony.
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  #13  
Old April 20th, 2010, 11:36 PM
Suite Travels Suite Travels is offline
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Crystal always tip's over. LOL
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  #14  
Old April 20th, 2010, 11:39 PM
Suite Travels Suite Travels is offline
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We have been through two hurricanes with Crystal and we all survived.
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  #15  
Old April 20th, 2010, 11:58 PM
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Quote:
Originally Posted by dd2355 View Post
Marginally better than Cynthia McKinney, but still a state embarrassment.

Props to the Admiral. I couldn't have held it together. (see vid @ 1:30)
I want to deny I even live in Georgia!! What a disgrace for a political leader. And that stupid ass is going to draw retirement and health care plus all the other benefits that a congressman gets for THE REST OF HIS LIFE!! It's a pity one can't resend the appointment.
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  #16  
Old April 20th, 2010, 11:58 PM
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I suggest that on your next cruise you sign up for the Behind the Fun tour and you can ask the chief engineer that very question!!!!
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  #17  
Old April 21st, 2010, 12:27 AM
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Quote:
Originally Posted by DocF View Post

The modern cruise ship is flat bottomed and slab sided. This is why they are very stable.
And real beotch to handle at slow speeds in high winds.
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  #18  
Old April 21st, 2010, 09:53 AM
jgmpuma jgmpuma is offline
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I mostly worry about my wife tipping over after all those DOD's.
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  #19  
Old April 21st, 2010, 09:59 AM
kzguns kzguns is offline
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Quote:
Originally Posted by DocF View Post
Fixed ballast, very wide beam, high cube design, water ballast, are all elements that combine to give a very stable ship with a draft of less than 26 feet in most cases. The deepest draft ship running until recently was the old Regal Empress which drew at least 32 feet. She was built in 1953, so that makes sense.

The modern cruise ship is flat bottomed and slab sided. This is why they are very stable.

A very good discussion about this aspect of ship design can be found in George W. Hilton's book Eastland: Legacy of the Titanic. The Eastland capsized in the Chicago River in 1915. It is out of print, but should be available at Amazon or ABE Books.

Doc
My first cruise was on the regal empress when she was the caribe I back in 1989.
Anyway like most have said here these ships have huge heavy keels google for some pics of some of these ships in dry dock you'll see.

KZ
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  #20  
Old April 21st, 2010, 10:31 AM
elcuchio24 elcuchio24 is offline
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It is exactly that wide, shallow hull that makes it more stable then deep keeled ships with shorter beams.
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