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Old October 2nd, 2009, 01:01 PM
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Default Odd question... how can they predict tonnage?

A question just occurred to me.... while sitting here looking at the new pictures of Oasis... how is it possible for designers to predict with a great degree of accuracy, how many tons a ships design will end up weighing??
When I started pondering this question, it started giving me a headache !!

Any thoughts ?
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Old October 2nd, 2009, 01:40 PM
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The "tonnage" of a ship has nothing to do with the weight of the ship:

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

Another interesting read: http://www.oasisoftheseas.com/chairm...how-big-is-it/

Also remember that cruise lines have been noted for "inflating" the advertised tonnage numbers of their ships to mislead the public.
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Old October 2nd, 2009, 01:46 PM
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I think I once read where RCI included the balconies in their gross tonnage for the Freedom class, which supposedly pushes the definition a bit.
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Old October 2nd, 2009, 03:54 PM
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Default Ship Tonnage

Wow! And all this time I thought there was this REALLY, REALLY big scale somewhere

Seriously, on one cruise, during the Captain's reception, a passenger actually asked how they found a scale large enough to weigh the ship....
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Old October 2nd, 2009, 05:37 PM
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And then there is displacement, as is used by naval vessels, such as "the USS Nimitz has a displacement of 95,000 tons". http://en.wikipedia.org/wiki/Displacement_(ship)

I won't get into a ship's plimsoll line.
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Old October 3rd, 2009, 10:33 AM
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I'm with Pooter I also thought there is a hugh scale out there that they use for ships.
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Old October 4th, 2009, 12:31 AM
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Dave, if I remember correctly the " displacement " tonnage used by Naval ships has to do with the amount of water displaced by the ship itself--am I right on that ?
Also, as mentioned the tonnage you hear thrown about by almost every source, even those who work for and on passenger ships has to do with space--not weight of the ship.
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Old October 4th, 2009, 03:38 AM
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Default Re: Odd question... how can they predict tonnage?

Quote:
Originally Posted by Mike-Suz
A question just occurred to me.... while sitting here looking at the new pictures of Oasis... how is it possible for designers to predict with a great degree of accuracy, how many tons a ships design will end up weighing??
When I started pondering this question, it started giving me a headache !!

Any thoughts ?
The brilliant engineering of these magnificent ships is beyond the comprehension of us laymen and really not even worth pondering.

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Old October 4th, 2009, 01:48 PM
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Quote:
Originally Posted by Ron
Dave, if I remember correctly the " displacement " tonnage used by Naval ships has to do with the amount of water displaced by the ship itself--am I right on that ?
Also, as mentioned the tonnage you hear thrown about by almost every source, even those who work for and on passenger ships has to do with space--not weight of the ship.
I fixed the link in my previous post, which explains the displacement tonnage. Essentially yes, it is the amount of water the ship displaces for naval ships. Commercial vessels use gross tonnage which is really a volume deal, but only for certain areas of the ship.
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Old October 4th, 2009, 04:27 PM
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Tonnage now is the volume of the ship within the hull.
Some cruiselines put there balconies outside the hull.
100 cubic feet = 1 ton.
there fore a 103,000 ton ship is 1,030,000 cubic feet.
This applies to all ship military or comericial.
This change was done it the request of the Panama Canal Authority
to compensate for the number of containers that go thru the canal.
Each 40 ft container is (12x12x40=5760 cubic ft) or 57 tons.
Therefore a container ship carrying 5000 containers is at least
285 ,000 tons ( most are at least 400,000 tons)
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Old October 4th, 2009, 05:58 PM
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Quote:
Originally Posted by doopydozer
This applies to all ship military or comericial.
All I can say is if you go to navy.mil and look, all the naval vessels are listed by displacement and not gross tonnage.
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Old October 4th, 2009, 06:38 PM
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Military might list it differently . If the ship goes thru the Panama Canal
that is how tolls are calculated . I saw a show where they were comparing
tonnages.The Nimitz class carrier was lasted at 100,000 tons and the
Freedom of the Seas was listed 160,000 tons. Acording to a
marine engineer/ship designer in the family , all ships are now
rated in the tonnage that Panama Canal would use to charge
the transit tolls.
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Old October 4th, 2009, 10:04 PM
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Dave's right about the Navy and displacement tonnage. Maybe the Canal figures it some way differently to make the most of it though.

I wasn't in the Navy--was in the Army and our " tonnage " was measured by what all you had to carry and still be able to walk or run !!
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Old October 4th, 2009, 10:20 PM
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Quote:
Originally Posted by Ron
Dave's right about the Navy and displacement tonnage. Maybe the Canal figures it some way differently to make the most of it though. I wasn't in the Navy--was in the Army and our " tonnage " was measured by what all you had to carry and still be able to walk or run !!
Actually I was in the Navy and served on the Nimitz (and the Texas CGN-39). Disclosing the volume of a naval vessel, as in gross tonnage, would probably be a national security issue. Would we really want our opponents to know the open area inside our war ships? I think not.

But I was also a Marine (before I joined the Navy) so I know about that "carry and still be able to walk" stuff too!
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Old October 4th, 2009, 10:22 PM
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Gross Registered Tonnage (GRT) is basically calculated by the usable space within the ship.

If they went by displacement tonnage there would be a major increase on every ship that I sail.

Take care,
Mike
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Old October 5th, 2009, 02:14 AM
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I thank you all for these answers to my question! I'm just a tad smarter now... (don't worry Dave... it's minuscule amount.. I'm still a layman!)
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Old October 5th, 2009, 07:48 AM
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I hope I did not sound demeaning, I think curiosity is a good thing. You are more ambitious then I am for even thinking about things like this.

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Old October 6th, 2009, 06:41 AM
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Does anyone know where the word tonnage come from and why they use "ton" when they talk about volume? Why not use qubic feet?

The reason why I wonder is that in many parts of the world where the metric system (is that the correct term for what I mean?) is used, ton is weight and not volume.

For me it's very strange that they in their brochures mention how long the ships are in meters and the sizes of the cabins are in squaremeters but they use tonnage to say how "big" the ships are. Not a problem but very inconsistant, I think.
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Old October 6th, 2009, 10:58 AM
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The weight(volume) tons original came the a barrel of wine.
The ships where rated in how may "Tuns" they could carry.
See link for description of a "Tun".
I think that one of the books written by Douglas Ward
explains what tonnage is .

http://en.wikipedia.org/wiki/Tun_(volume)

Below is the link that explains what Tonnage of a ship is and how
it is calculated.

http://www.imo.org/Conventions/conte...259&doc_id=685
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Old October 6th, 2009, 03:42 PM
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Quote:
Originally Posted by doopydozer
The weight(volume) tons original came the a barrel of wine.
The ships where rated in how may "Tuns" they could carry.
See link for description of a "Tun".
I think that one of the books written by Douglas Ward
explains what tonnage is .

http://en.wikipedia.org/wiki/Tun_(volume)

Below is the link that explains what Tonnage of a ship is and how
it is calculated.

http://www.imo.org/Conventions/conte...259&doc_id=685
Thanks
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