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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 ]
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 !
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.
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
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.
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.
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.
RCI ships et al don't need them?
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:
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.
I suppose Queen Vic will have an air-scoop funnel too, but not really need it then?
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.
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.
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.
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.
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