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» Cruise Talk   » Technically Speaking   » Do cruise ships have to have a funnel? (Page 1)

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Author Topic: Do cruise ships have to have a funnel?
J.S.S.Normandie
First Class Passenger
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posted 09-01-2006 02:41 PM      Profile for J.S.S.Normandie     Send New Private Message      Edit/Delete Post  Reply With Quote 
Is it neccesary? Couldnt the exhaust be piped out the stern?
Posts: 1197 | From: Massachusetts where the Brittania was trapped! | Registered: Feb 2006  |  IP: Logged
Ernst
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posted 09-01-2006 03:01 PM      Profile for Ernst   Author's Homepage   Email Ernst   Send New Private Message      Edit/Delete Post  Reply With Quote 
Nowadays cruise ships need a funnel. Putting an exhaust at the stern would not be sufficient for the power plants found on ships these days. (the passengers would probably suffocate )

There are nevertheless plans to put the exhaust under water - if I remeber right it is at MARIN where studies are made how one could take advantage of the exhaust gases to reduce the frictional drag of a vessel. To my knowledge this has not yet been realized and I am not sure whether it would make sense for a cruise ship.

In the more distant future there might be fuel cell powered cruise ship which would not need a funnel like we find it on ships today.

[ 09-01-2006: Message edited by: Ernst ]


Posts: 9746 | From: Eindhoven | Registered: Jan 2005  |  IP: Logged
J.S.S.Normandie
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posted 09-01-2006 03:24 PM      Profile for J.S.S.Normandie     Send New Private Message      Edit/Delete Post  Reply With Quote 
Thank you, very interesting. I hope somthing comes of that idea although it would probably pollute the water a great deal.
Posts: 1197 | From: Massachusetts where the Brittania was trapped! | Registered: Feb 2006  |  IP: Logged
Ernst
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posted 09-01-2006 03:36 PM      Profile for Ernst   Author's Homepage   Email Ernst   Send New Private Message      Edit/Delete Post  Reply With Quote 
I am not sure what is worse - blowing it into the atmosphere or in the water (some soot will end up in the water anyhow) - but I assume that this is one of the major questions which have to be clarified in detail. (And I guess for cruise ships it is even more demanding to awnser this question - mind you that cruise ships also go to sensitive more confined regions)
Also, I wonder how efficient these systems are when the ship is not moving.

Posts: 9746 | From: Eindhoven | Registered: Jan 2005  |  IP: Logged
Gerry
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Member # 168

posted 09-01-2006 03:44 PM      Profile for Gerry     Send New Private Message      Edit/Delete Post  Reply With Quote 
I found this aspect of ship design fascinating. In the wind tunnel testing, they use a scale model of the ship and first establish the 'boundary' layer surrounding the ship by blowing tiny soap bubbles in a stream over the ship whilst in the tunnel. These bubbles are filled with helium to have the correct scale effect. This boundary layer is then visible, caught on video. The funnel must then work such that the exhaust gases are projected out of, or through this boundary layer so they do not come back to the deck. The exhausts are scaled and blow more helium bubbles to see if they go through the boundary layer. If not, the exhausts can be constricted so the gases come out under more pressure so they get through the layer. These variables have to be done with knowledge of exhaust gas pressures etc of boilers and other machinery. Sometimes, air conditioning extracts are ducted through the funnel to craft the flow so it goes through the boundary layer. The shape of the funnel is also fashioned to assist too of course.
All very interseting to watch.

Just as fascinating is the other test done in the wind tunnel but this time with a dark coloured model and bright yellow cracked wheat spread all over it. Whats blown away and the dark model is visible after the wind tunnel is turned on and the model is rotated marks where there will be too much wind for comfort and scaled wind screens are added. - Wheat is used as it blows away to atmosphere and the local bird population clear it up !


Posts: 315 | From: Miami, Florida, (originally from UK) | Registered: Jun 99  |  IP: Logged
Ernst
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posted 09-01-2006 04:14 PM      Profile for Ernst   Author's Homepage   Email Ernst   Send New Private Message      Edit/Delete Post  Reply With Quote 
quote:
Originally posted by Gerry:
I found this aspect of ship design fascinating. [...]

I have been told that it is difficult to get you guys out of the wind tunnel.


Posts: 9746 | From: Eindhoven | Registered: Jan 2005  |  IP: Logged
J.S.S.Normandie
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posted 09-01-2006 04:27 PM      Profile for J.S.S.Normandie     Send New Private Message      Edit/Delete Post  Reply With Quote 
I had been wondering this because I had an idea for a ship design with windowed mock funnels which served as passenger space. But of course with no real funnels there is the problem of the smoke. I'll post a rendition later.
Posts: 1197 | From: Massachusetts where the Brittania was trapped! | Registered: Feb 2006  |  IP: Logged
Pascal
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posted 09-01-2006 07:00 PM      Profile for Pascal     Send New Private Message      Edit/Delete Post  Reply With Quote 
I like funnels. I think ships aesthetic would be greatly impaired whithout them. Sometimes, with some modern cruise ships, it's the only element (with the bow) likely to remind you that it's a ship, not an appartment block.
Posts: 1371 | From: Aix en Provence | Registered: Mar 2005  |  IP: Logged
Linerrich
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posted 09-01-2006 07:18 PM      Profile for Linerrich   Email Linerrich   Send New Private Message      Edit/Delete Post  Reply With Quote 
quote:
Originally posted by Pascal:
I like funnels. I think ships aesthetic would be greatly impaired whithout them. Sometimes, with some modern cruise ships, it's the only element (with the bow) likely to remind you that it's a ship, not an appartment block.

And the bow appears to be an after-thought on some ships, like PRIDE OF AMERICA!

Rich


Posts: 4210 | From: Miami, FL | Registered: Jul 2004  |  IP: Logged
J.S.S.Normandie
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posted 09-01-2006 11:58 PM      Profile for J.S.S.Normandie     Send New Private Message      Edit/Delete Post  Reply With Quote 
Sorry for the poor quality but here is a rough rendition of my ship with the glass funnes compatable for passenger space..eg nightclubs bars etc..


Posts: 1197 | From: Massachusetts where the Brittania was trapped! | Registered: Feb 2006  |  IP: Logged
6263866
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posted 09-02-2006 12:31 AM      Profile for 6263866   Email 6263866   Send New Private Message      Edit/Delete Post  Reply With Quote 
Im pretty sure if they really didn't want to have a funnel, they could work it out. However, I think the funnel should be on all cruise ships, kinda what makes a ship, a ship. Some of them look cool to.

For using a funnel for passenger space,
doesn't the Carnival Pride do that, with a night club, and a supper club in the forward section?
Looks pretty nice, but I don't think I'd like eating in a place where everything looks red b/c of the window tint.


Posts: 580 | From: San Francisco | Registered: Oct 2004  |  IP: Logged
J.S.S.Normandie
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posted 09-02-2006 12:37 AM      Profile for J.S.S.Normandie     Send New Private Message      Edit/Delete Post  Reply With Quote 
quote:
Originally posted by 6263866:

Looks pretty nice, but I don't think I'd like eating in a place where everything looks red b/c of the window tint.


The red and bue section of the funnel at the back is not actually glass that section is a steel support for the main tower which contains the passanger space.


Posts: 1197 | From: Massachusetts where the Brittania was trapped! | Registered: Feb 2006  |  IP: Logged
Pascal
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posted 09-02-2006 05:16 AM      Profile for Pascal     Send New Private Message      Edit/Delete Post  Reply With Quote 
quote:
Originally posted by 6263866:

For using a funnel for passenger space,
doesn't the Carnival Pride do that, with a night club, and a supper club in the forward section?

Isn't one of the Disney ships 2 funnels a mock one with some public rooms ?
I know that Normandie 3rd funnes was there only for aesthetic purpose and was used as kennel.


Posts: 1371 | From: Aix en Provence | Registered: Mar 2005  |  IP: Logged
moodus2
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posted 09-02-2006 09:44 AM      Profile for moodus2   Email moodus2   Send New Private Message      Edit/Delete Post  Reply With Quote 
besides emitting emissions from the boilers or diesel engines i think the stack or
stacks serve as a signature as
to who they are.

Posts: 473 | From: moodus,ct. | Registered: Sep 2001  |  IP: Logged
Ernst
First Class Passenger
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posted 09-02-2006 10:12 AM      Profile for Ernst   Author's Homepage   Email Ernst   Send New Private Message      Edit/Delete Post  Reply With Quote 
We are all used to funnels - but the funnel and the uptakes have eversince been a problem for the design of ships. Getting rid of these obstacles would allow new and interesting solutions.
Posts: 9746 | From: Eindhoven | Registered: Jan 2005  |  IP: Logged
Carlos Fernandez
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posted 09-03-2006 12:44 PM      Profile for Carlos Fernandez   Author's Homepage   Email Carlos Fernandez   Send New Private Message      Edit/Delete Post  Reply With Quote 
Where are the funnels in large mega-yachts?
Posts: 1325 | From: Miami, Florida (Cruise Capital of the World) | Registered: Apr 2006  |  IP: Logged
Malcolm @ cruisepage
Cruise Director
Member # 301

posted 09-03-2006 02:50 PM      Profile for Malcolm @ cruisepage     Send New Private Message      Edit/Delete Post  Reply With Quote 
Gerry, why are the QE2 and QM2 the only ships to have funnels with those air-scoop things to assist revoming the fumes and soot?

RCI ships et al don't need them?


Posts: 19210 | From: Essex (Just Outside London) | Registered: A Long Time Ago!  |  IP: Logged
Linerrich
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Member # 4864

posted 09-03-2006 03:39 PM      Profile for Linerrich   Email Linerrich   Send New Private Message      Edit/Delete Post  Reply With Quote 
quote:
Originally posted by Pascal:
[QB]
Isn't one of the Disney ships 2 funnels a mock one with some public rooms ?
QB]

Both the DISNEY MAGIC and DISNEY WONDER have dummy forward stacks, which have 2-level, multi-use observation bars and sports bars, with glass facades looking forward and aft. Here is the MAGIC's forward funnel:

Rich


Posts: 4210 | From: Miami, FL | Registered: Jul 2004  |  IP: Logged
sslewis
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posted 09-06-2006 01:38 PM      Profile for sslewis   Author's Homepage   Email sslewis   Send New Private Message      Edit/Delete Post  Reply With Quote 
Many ships have.had "dummy" funnels to balance their profile.
It is nice that Disney did so but many motorliner only needed one funnel when teh fashion was 2.
Now, I hear that Nukie Savannah needn't one at all!
I also observed a very stylish yahct with funnel in the mast.
I saw this on many cruiseships whose mast is thicker than usual....

Posts: 2513 | From: Shipspotting Solent shores when weather allows.... | Registered: Feb 2003  |  IP: Logged
Gerry
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Member # 168

posted 09-07-2006 01:59 PM      Profile for Gerry     Send New Private Message      Edit/Delete Post  Reply With Quote 
Malcolm,

I believe its because of the speed of the ships.

The boundary layer or envelope I mentioned before can go higher with the higher windspeeds over the deck so the exhausts need to be sent higher to get out of the boundary envelope. It is only really an issue with higher relative wind speeds.


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Malcolm @ cruisepage
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posted 09-07-2006 03:42 PM      Profile for Malcolm @ cruisepage     Send New Private Message      Edit/Delete Post  Reply With Quote 
Interesting Gerry.

I suppose Queen Vic will have an air-scoop funnel too, but not really need it then?


Posts: 19210 | From: Essex (Just Outside London) | Registered: A Long Time Ago!  |  IP: Logged
greybeard
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Member # 5284

posted 09-07-2006 05:04 PM      Profile for greybeard     Send New Private Message      Edit/Delete Post  Reply With Quote 
quote:
Originally posted by Malcolm @ cruisepage: Gerry, why are the QE2 and QM2 the only ships to have funnels with those air-scoop things to assist revoming the fumes and soot? RCI ships et al don't need them?

The QM2 had to have an unsatisfactorily squat funnel in order to keep the ship's air draft within the limits needed to sail under the Verrazano Narrows bridge on entry to New York harbour.

The air scoop compensates for the lack of funnel height, in order to keep fumes and soot off the after decks.


Posts: 587 | From: London | Registered: Dec 2004  |  IP: Logged
Malcolm @ cruisepage
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posted 09-07-2006 05:15 PM      Profile for Malcolm @ cruisepage     Send New Private Message      Edit/Delete Post  Reply With Quote 
quote:
Originally posted by greybeard:
The air scoop compensates for the lack of funnel height, in order to keep fumes and soot off the after decks.

Most of us agreed that the QM2 funnel looked squat when we first saw it, in comparison to the ship's size, but it is still pretty tall.

You teary does not explain wht the QE2 has a scoop funnel, yet the funnel is tall in proportion to her size and fits under the bridge with more room to spare.


Posts: 19210 | From: Essex (Just Outside London) | Registered: A Long Time Ago!  |  IP: Logged
Ernst
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posted 09-07-2006 06:00 PM      Profile for Ernst   Author's Homepage   Email Ernst   Send New Private Message      Edit/Delete Post  Reply With Quote 
It's also a question of 'taste' - there are no unique solutions to fluid dynamics problems - and for the funnel desing the appearance is important - especially in case of QM2. I may assume that the wish to reuse the design of QE2 played a very big role.

Generally a tall thin funnel (as far astern as possible) would be nice - one wants to be away from disturbances. This is why the pipes are protruding out of modern funnels and why many funnels try to be as 'transparent' (for the airflow) as possible.
Also, do not forget that the wind is not always coming from the front - ships are not that fast compared to possible windspeeds.


Posts: 9746 | From: Eindhoven | Registered: Jan 2005  |  IP: Logged
greybeard
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posted 09-07-2006 06:53 PM      Profile for greybeard     Send New Private Message      Edit/Delete Post  Reply With Quote 
quote:
Originally posted by Malcolm @ cruisepage: Most of us agreed that the QM2 funnel looked squat when we first saw it, in comparison to the ship's size, but it is still pretty tall.

It's huge.

see picture

But it's still disproportionately short.


Posts: 587 | From: London | Registered: Dec 2004  |  IP: Logged

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