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Old 02-08-2011, 07:39 AM   #21
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RE: Two boats for Eric

Quote:
Peter B wrote:I feel drawn to the Alaska 46 Sedan in the link as my concept of the 'ideal' boat, if money was not an object, and admitting I am never likely to make the sort of voyages to justify a Nordy...
Peter B,

Hey Doc you do not have to be a F1 driver to own a Porsche.* Same thing with a Nordy.* But I like you Alaska as well.

Just sayn.

*
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Old 02-08-2011, 11:20 AM   #22
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RE: Two boats for Eric

WALT-
You asked me a difficult question and I stressed over it for a time and came up w a reasonable answer and now you're telling me you dodn't know the answer yourself???
I won't ever know if I'm right? If that grey boat only drew 28' I would think it would roll over w all those birds on the upper deck. I'd say it's just as likely to be 50'. But that's a lot of boat under the water. And about the FB...***** I didn't say I could tell the CG of a boat**** ... you did. I only assumed the obvious that the CG of a boat w a FB is going to be higher than one without** ...and significantly so but not (in most cases) dangerously so. Don't need any magic to tell that. The IGs are fine and I'm still looking at one*** ..out of the corner of my eye. Now** ...where's the CG on that grey boat Walt.
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Old 02-08-2011, 11:24 AM   #23
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RE: Two boats for Eric

I will say I was fortunate enough to be at the Miami boat show awhile back when the economy was booming and Nordy had every single boat in their line up on display(62 was the biggest at the time). I boarded each and every one of them. And the N50 was far and above my favorite. Just overall layout insdie and out made it a very nice boat that compromised all areas equally....or at least areas that are important to me....
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Old 02-08-2011, 12:14 PM   #24
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Two boats for Eric

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nomadwilly wrote: *I'd say it's just as likely to be 50'. But that's a lot of boat under the water. Now** ...where's the CG on that grey boat Walt.
Actually, the draft of the Enterprise is around 40 feet.

Walt*looked up the WW2 version ... and just for grins, the CG on that beast was around 15 feet above the waterline. And you are correct about the location of the vertical CG*of the nuke*version, *it is most likely several feet above the waterline with those planes on deck.

So, Walt, where do you think it should be? Where is it on your own boat?*

And where do you think the CG is located on one of those*"high rise"*cruise ships with*"flying bridges" high enough to create their own glaciers*and can just barely squeeze through the Panama Canal.


-- Edited by RickB on Tuesday 8th of February 2011 01:14:58 PM
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Old 02-08-2011, 12:39 PM   #25
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RE: Two boats for Eric

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RickB wrote:

And where do you think the CG is located on one of those*"high rise"*cruise ships with*"flying bridges" high enough to create their own glaciers*and can just barely squeeze through the Panama Canal.

I see the cruise ships docked in Seattle during their summer season and as they get larger and larger I often wonder how tippy they really are.* The story is all about maximizing volume and guest space but as these things continue to get bigger, I'm curious if they are getting perilously close to instability.* Or are they more stable than they look?

*
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Old 02-08-2011, 12:54 PM   #26
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RE: Two boats for Eric

Are you kidding? Cruise ships handle rough seas very well. This one didn't even spill a single glass of champagne!

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Old 02-08-2011, 01:18 PM   #27
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RE: Two boats for Eric

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Marin wrote:


RickB wrote:

And where do you think the CG is located on one of those*"high rise"*cruise ships with*"flying bridges" high enough to create their own glaciers*and can just barely squeeze through the Panama Canal.

I see the cruise ships docked in Seattle during their summer season and as they get larger and larger I often wonder how tippy they really are.* The story is all about maximizing volume and guest space but as these things continue to get bigger, I'm curious if they are getting perilously close to instability.* Or are they more stable than they look?

*

Newer cruise ships*of similar size tend to have less stability (measured by GM, the distance between the CG and the ship's metacenter) than older cruise ships.* But they tend to be safer than older ships because of the way they are designed/compartmented.*

A TITANIC*type of catastrophic event would probably not produce a sinking in modern cruise ships, it would take*a much larger catastrophe.*

It's my understanding that the GM on cruise ships is usually somewhat less than 1 meter.* Depending on how they are loaded/trimmed/ballasted, the GM on certain fast containerships can be as little as 0.6 meters.* A GM of under 2 meters tends to be the most comfortable for the*crew when*at sea,*a GM of 4 or higher tends to create a*very uncomfortable*motion.

Any vessel with a small GM needs care in handling, as they tend to have unstable steering which means that the rate of turn accelerates given a steady rudder angle.* On cruise ships, having the ship turn without heeling is important (as you might imagine), and their quartermasters are well trained to achieve this.* At sea, their autopilots are configured/trusted to keep heel to a minimum.

*
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Old 02-08-2011, 01:46 PM   #28
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Two boats for Eric

Quote:
Marin wrote:

I see the cruise ships docked in Seattle during their summer season and as they get larger and larger I often wonder how tippy they really are.* The story is all about maximizing volume and guest space but as these things continue to get bigger, I'm curious if they are getting perilously close to instability.* Or are they more stable than they look?

*
On my last cruise (trans-Atlantic, Nov. 2010) we had waves 50+ feet in height (I previously posted photos of them) hitting us abeam which rolled the ship perhaps 15 degrees or so.* Some people fell with their chairs in the dining room, including*silverware, glasses, plates, etc. (including a bowl of milk on my lap) resulted in the dining room.* Here's a photo of one of the ship's stores:

-- Edited by markpierce on Tuesday 8th of February 2011 03:43:01 PM
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Old 02-08-2011, 03:15 PM   #29
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RE: Two boats for Eric

All the talk about GM is nice, a small distance between G and M makes for a nice ride for the boxes and bluehairs but the question for Walt was where is the vertical CG located? What distance above the keel?

Where is it on your boat? On a tugboat? A cruiseship? An aircraft carrier? A megayacht?
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Old 02-08-2011, 04:39 PM   #30
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Two boats for Eric

Quote:
SeaHorse II wrote:Since Enterprise is about 28 feet below the waterline, I question if her CG is as high as you say it is.
Eric, RickB and anyone else:

Please note that I never said I knew where Enterprise's CG is...I questioned
Eric's* "guess" as to where it is. After an exhaustive search for the answer,
it appears the Navy doesn't want us to know the answer! The only thing
close to an answer that I've been able to find is this excerpt from a study that
was done on using old nuclear ships for offshore water & power plants.

Where did I get the 28 feet number from? While taking a launch to the ship many
years ago, as we approached the gangway from the bow, There was a "28"
painted very clearly at the water line. Of course the ship was totally empty
with no planes, fuel for the "tin cans', etc. and that number stuck in my head. The official draught is listed at 39 feet.

Rick, you said I looked up the WWll version of carriers (which I didn't) but I would love to kow where that info is at. Do they list the CGs for those ships? You, however, were very accurate on the draught of Enterprise as you guesed 40 feet.


While searching for the CG info, I copied the specs on "The Big E" from Wikipedia.


.


*




-- Edited by SeaHorse II on Tuesday 8th of February 2011 05:47:57 PM
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Old 02-08-2011, 04:51 PM   #31
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RE: Two boats for Eric

so the second prop drive is for stabilizing purposes?
and NOT get home purpose?

boat on the water and boat in the water hull designs.

and btw i prefer the Hatt without the FB, its just a more sleek and streamlined look.
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Old 02-08-2011, 06:51 PM   #32
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RE: Two boats for Eric

Walt m man,
When you started talk'in fight'n words and stuff jerk'in my chain I decided to play your game and jerk you back. Got the stats from RB and so I really knew about the grey boat.
The only part that was'nt a joke was the part about what a great boat the IG is. I'm com'in out of the woods now as I think it's gone far enough and really don't want to piss you off or hurt your feelings ect. Hope you had fun too. Till one of us gets clever again...

Cheers
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Old 02-08-2011, 09:01 PM   #33
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RE: Two boats for Eric

Eric:

You're not pissing me off! Just two old guys jousting a little.
Now, It's time for me to have my warm milk and watch my favorite shows.
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Old 02-08-2011, 09:02 PM   #34
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Two boats for Eric

-- Edited by GLee on Tuesday 8th of February 2011 10:05:17 PM

-- Edited by GLee on Tuesday 8th of February 2011 10:22:55 PM
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Old 02-08-2011, 09:04 PM   #35
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Two boats for Eric

Marin - sure the Nordhavn is a 50? Looks a bit more like a 57.
Tidahapah - do you recall the name of the 50 near you. I'm making a database of N-50's and would like to include the one near you.
Thanks,
Greg

-- Edited by GLee on Tuesday 8th of February 2011 11:07:07 PM
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Old 02-08-2011, 09:10 PM   #36
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RE: Two boats for Eric

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GLee wrote:

Eric - sure the Nordhavn is a 50? Looks a bit more like a 57.
Tidahapah - do you recall the name of the 50 near you. I'm making a database of N-50's and would like to include the one near you.
Thanks,
Greg
You know, I think you're correct.* The boat in the yard looks so much like the N50 one dock over from us that I assumed it was the same model when I went into the yard*and grabbed the photos.* The N50 has near us has a bulbous bow like the one in the yard.* But if you start counting windows and ports, they are different.* So my mistake, it looks like.

The N50 in the marina near us is named "Prime Time."

*
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Old 02-08-2011, 09:12 PM   #37
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RE: Two boats for Eric

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GLee wrote:
Eric - sure the Nordhavn is a 50? Looks a bit more like a 57.
I was on a 57 Nordy about 7 years ago at April Point, Quadra Island, BC and it
looked * exactly like the one you question.* I. too, think it's a 57.

*
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Old 02-08-2011, 09:17 PM   #38
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Two boats for Eric

Marin,
Thanks - Prime time is hull #7, 1999 model year.
Greg

-- Edited by GLee on Tuesday 8th of February 2011 11:05:13 PM
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Old 02-08-2011, 09:34 PM   #39
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RE: Two boats for Eric

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GLee wrote:

Eric,
Thanks
I'm not Eric. *Eric spells his name different than mine

*
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Old 02-08-2011, 10:00 PM   #40
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RE: Two boats for Eric

Marin,
My apologies. Still a newbie and learning to navigate this site.
Take care,
Greg
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