That is one...big...ship.

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drinkmorejava

Diamond Member
Jun 24, 2004
3,567
7
81
Yeah, I was working on something involving the boundary layer around a ship that size being too big for the tugs to make an approach so they basically have to suction themselves to the ship by sucking out the water between the tug and the ship but it just didn't seem plausible.

But wouldn't the APG caused by the tugs' sucking precipitate boundary loss, thereby increasing the drag of the ship, thus requiring the ship to burn more gas to move, and the subsequent CO2 emissions ultimately causing 5 baby seals to drown?
 

Tiamat

Lifer
Nov 25, 2003
14,068
5
71
Oh, I almost forgot to mention the tug boats. They're spraying water to dissipate static charge in the air. Helicopters have to be grounded to avoid a static discharge. One theory as to the demise of the Hindenburg is that it was a static discharge that set it off. Big things that move tend to build up a static charge in certain locations. Ships are no exception

And, since the salt water conducts electricity, spraying it into the air where it becomes a mist helps discharge the potential difference in the air around the ship. That keeps dock workers safe & keeps the ships safe if they were to pass under a bridge on the way out of the harbor. Ever get out of your car and get a static shock? Imagine the shock from touching one of those big ships. It's only necessary some days - depending on atmospheric conditions. That's why they don't always do it & why they never have to do it at some ports.

And, now that you've read all this, I hope you're disappointed to discover that I'm bullshitting you (some of you will fall for it up until this sentence.) They actually do that as a salute.

lol.
 

DrPizza

Administrator Elite Member Goat Whisperer
Mar 5, 2001
49,601
166
111
www.slatebrookfarm.com
It sounds plausible enough that you COULD be lying to me with the last sentence.

One of my friends was an electrical engineer in the Navy stationed on a carrier. I asked him a question once about the size of the ships vs. Earth's magnetic field lines, etc. I was quite surprised to learn that they use degaussing systems on the big ships to prevent magnetic anomolies & avoid mines.
http://systems.polyamp.com/products/degaussing-systems.html
http://www.inetwork-west.com/polyamp.html
http://digilander.libero.it/en_mezzi_militari/html/en_cavour.html
http://warships1discussionboards.yuku.com/topic/6859/t/USN-Ship-Degaussing.html

So, while static charge build-up isn't a problem (why would it be - the ship is in the ocean, known to be a very good conductor) magnetic fields ARE a problem.
 

destrekor

Lifer
Nov 18, 2005
28,799
359
126
Oh, I almost forgot to mention the tug boats. They're spraying water to dissipate static charge in the air. Helicopters have to be grounded to avoid a static discharge. One theory as to the demise of the Hindenburg is that it was a static discharge that set it off. Big things that move tend to build up a static charge in certain locations. Ships are no exception

And, since the salt water conducts electricity, spraying it into the air where it becomes a mist helps discharge the potential difference in the air around the ship. That keeps dock workers safe & keeps the ships safe if they were to pass under a bridge on the way out of the harbor. Ever get out of your car and get a static shock? Imagine the shock from touching one of those big ships. It's only necessary some days - depending on atmospheric conditions. That's why they don't always do it & why they never have to do it at some ports.

And, now that you've read all this, I hope you're disappointed to discover that I'm bullshitting you (some of you will fall for it up until this sentence.) They actually do that as a salute.

:biggrin:

you know, I was thinking... okay, when's he gonna say it. Then you said it, and I was relieved that you weren't actually believing yourself. You scared me Dr P.

btw, yeah, I can't see how it's hard to understand that the water jets were like a way of visually showing "huzzaahhhh!" or "tadaaa!" as the ship entered the port for the first time.
Most major new sea faring vessels get a mighty welcome into port for the first time.
 

olds

Elite Member
Mar 3, 2000
50,071
744
126
To people wondering why the water is spraying, you can use common sense and deduce that air has less resistance than water.
I want to invite you to my next party.
But, I'll keep you hidden till I want the guests to leave.
 

daniel1113

Diamond Member
Jun 6, 2003
6,448
0
0
It just makes me question even more - what's the point of going on a cruise vs. staying in a big hotel? It's a big floating hotel. What's the difference (besides cost)?


Also, I counted the lifeboats. I don't think there are enough.

The only time I enjoyed being on a cruise was when I took a Baltic Sea cruise with the family. Each morning we would be in a new port/country around Europe which was pretty nice. Otherwise, I agree with your general sentiment. They are just floating hotels.
 
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