what depth do they need

[oakleys]

i was just wondering if anyone knew what depth ships like the valor etc need to go into a port. when we were in cozumel it seemed quite shallow at the pier.

[GroupCruiser]

The Draft on most ships is around 26-28 feet depending on the ship, so I would guess a minimum of 30 would be required. I know going in to St. Thomas, the thrusters really stir up the bottom, so it must be pretty close.

[Chucksta63]

I was told in Cozumel by our dive instructor that the Triumph was 27 feet!:eek:

 

I could not beleave it. I have no clue how they stay righted in the water with 12+ story's in the air above water line and only 3 storys below..

[L2J]

i was just wondering if anyone knew what depth ships like the valor etc need to go into a port. when we were in cozumel it seemed quite shallow at the pier.

 

It does seem shallow but that might be becuase of the water clarity?

[derf5585]

I have no clue how they stay righted in the water with 12+ story's in the air above water line and only 3 storys below..

 

As explained to me most of the weight is below the waterline. Generators, fuel, water, provisions and stuff like that.

 

Ballast: How a Ship Keeps on Sailing Upright

from

http://www.gonomad.com/readuponit/2005/05/ballast-how-ship-keeps-on-sailing.html

 

The Chief Mate is responsible for the stability of the ship - he keeps the ship from tipping over.

from

http://www.punaridge.org/doc/journals/Careers/ChiefMate/Default.htm

[oakleys]

thanks guys amazing! we really stirred it up in belize to & that was a long tender ride away.

[GroupCruiser]

I've mentioned this once before. If the ship is not full of people, it will simply pop right out of the water. Why do you think they won't let anyone get off the ship until they have it tied down to the dock or set at anchor?

 

The reverse holds true as well, they will never untie it until all of the passengers are back on board.

 

Makes sense, right?

[smkerry]

I've mentioned this once before. If the ship is not full of people, it will simply pop right out of the water. Why do you think they won't let anyone get off the ship until they have it tied down to the dock or set at anchor?

 

The reverse holds true as well, they will never untie it until all of the passengers are back on board.

 

Makes sense, right?

 

The ship could sail just fine with only 100 people on board. Ships maintain stability by using sea water as ballast. As the ship burns fuel, it gets lighter. Sea water is pumped in to ballast tanks below the water line.

 

Simple physics. That is how a ship that 180' tall above the water line and only only 25-30 below maintains stability. It's all about weight distribution and passengers really have little to do with it. If you were splitting hairs, you could say that passengers make it LESS stable, as passengers are all on the higher decks.

[derf5585]

I've mentioned this once before. If the ship is not full of people, it will simply pop right out of the water.

 

Does this take in account the weight gain of passengers due to the sea air?

[4yanx]

Topics such as these quickly separate the sailers from the sailors. ;)

[big_duck]

Does this take in account the weight gain of passengers due to the sea air?

 

Hey Derf,

 

I see you are "destined" to take another cruise.

[jcs56]

The ship could sail just fine with only 100 people on board. Ships maintain stability by using sea water as ballast. As the ship burns fuel, it gets lighter. Sea water is pumped in to ballast tanks below the water line.

 

Simple physics. That is how a ship that 180' tall above the water line and only only 25-30 below maintains stability. It's all about weight distribution and passengers really have little to do with it. If you were splitting hairs, you could say that passengers make it LESS stable, as passengers are all on the higher decks.

 

This makes much more sense to me.

[derf5585]

Topics such as these quickly separate the sailers from the sailors. ;)

 

The term "eskomer," often applied to fast sailers, was probably an old buccaneer term for their vessels;

from

http://www2.friend.ly.net/~dadadata/kemp/dictS1.html

 

MotorSailers 8/29/05

from

http://www.greekyachts.gr/public/catalog/html/catalog-MS.html

[derf5585]

Hey Derf,

 

I see you are "destined" to take another cruise.

 

It is my destiny to have a "Date With Destiny" just don't tell Derfette

[gtalum]

5000 people (passengers + crew) only weight about 750,000 pounds. On a 100,000 ton ship, that's a drop in the bucket. The weight of the passengers is almost completely negligible.

[GroupCruiser]

100,000 tons is not the weight of the ship. One Gross Registered Ton is an area 10 by 10 by 10, or 100 cubic feet of enclosed space. It was on old term used to measure carrying capacity of ships.

 

Displacement is the weight of the water moved out of the way by the ship sitting in it, and I believe the term Deadweight is the actual weight of the ship minus fuel, water, and other supplies. It's far less than 100,000 tons.

[derf5585]

100,000 tons is not the weight of the ship.

 

It is known as displacement, as it is equal to the weight of the water displaced by the ship when floating at her designed waterline.

from

http://users.senet.com.au/~gittins/dimensions.html

 

"This is probably the most confusing thing we ship junkies ever have to deal with, other than perhaps trying to justify the logic behind continuing the Passenger Services Act.

 

In the case of passenger ships, the word 'tonnage' is a measurement of space, NOT of weight. GRT (or Gross Registered Tonnage) measures the amount of enclosed space within the confines of the hull and superstructure. The problem is further complicated because there is no one universal standard of measurement for this. Americans measure gross tonnage by one set of criteria, the British use another, the Panama Canal has yet a third way for toll purposes, and the Suez Canal sets its own standard.

If you notice, many of the new megaships have physical dimensions (length and width) that are considerably smaller than some of the great ships of the past, yet their 'tonnage' is significantly greater. This has to do with their design, not the use of heavier materials. Most modern ships have superstructures which almost completely cover the hull. No long, sweeping bows, no gradually stepped decks fore and aft, just a stubby point connected to a shoebox. That box contains far more enclosed space than the graceful designs of the past.

In order to find out what a ship would actually weigh if put on a gigantic bathroom scale, you need to ask for the 'displacement tonnage.' That is the amount of water 'pushed aside' by the actual weight of the ship sitting in it. The two are vaguely equal. If a ship displaces lets say, 50,000 tons of water, that is the actual weight of the steel, wood, aluminum, engines, etc., although the gross tonnage may be much higher.

Passenger ships are measured by gross tonnage, but naval ships are always measured by displacement tonnage. There is also a third measurement called 'deadweight tonnage' but let's not go there."

[derf5585]

5000 people (passengers + crew) only weight about 750,000 pounds. On a 100,000 ton ship, that's a drop in the bucket. The weight of the passengers is almost completely negligible.

 

So if the average passenger gaines 5 pounds 2000 passengers the total added weight is 10,000 pounds of 5 tons.

[AppleValleyCruisers]

An interesting and informational thread.

 

Sort of off-topic now, but I wondered why they don't include the the depth of the ocean of where the ship is at along with the vessel speed, wind speed and ship location on the ship tracking channel on your cabin TV. That would be (somewhat) interesting.

[davidaperryman]

If too many passengers get to one side or the other of the ship on the upper deck the captain will call a special alarm on the loud speaker.

 

TIPSY TURVEY - PORT or

 

TIPSY TURVEY - STARBOARD

 

Then all of the crew will stop what they are doing and run to one side of the ship to counteract the overweight condition. That is the only thing that keeps the ship from turning over. :)

[LynnA]

Probably would scare some passengers if they knew the real depth at sea.

[derf5585]

If too many passengers get to one side or the other of the ship on the upper deck the captain will call a special alarm on the loud speaker.

 

And the age old question.

If everyone flushes at the same time will the ship go faster.

[gtalum]

So if the average passenger gaines 5 pounds 2000 passengers the total added weight is 10,000 pounds of 5 tons.

 

But they had to eat food, which was mostly already on the ship, to gain that weight. SO there's no net weight gain there. :)

[losuds63]

I was told in Cozumel by our dive instructor that the Triumph was 27 feet!:eek:

 

I could not beleave it. I have no clue how they stay righted in the water with 12+ story's in the air above water line and only 3 storys below..

----the ship is constructed in two parts first there is the hull and thats what floats the ship and the top is built on ,so in most cases the only way the ship can sink is if the hull is compromised so what ever happens on top doest matter even if there is a fire the ship will float!;)

[derf5585]

,so in most cases the only way the ship can sink is if the hull is compromised so what ever happens on top doest matter even if there is a fire the ship will float!;)

 

sinking occurs only, when the weight of the ship and cargo exceeds the available buoyancy of the hull and when capsize has not occurred previously.

from

http://heiwaco.tripod.com/impossiblesinking.htm

 

"Loose Lips Sink Ships"

from

http://www.eyewitnesstohistory.com/lslips.htm