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Post by lmtengs on Dec 18, 2010 19:15:51 GMT -8
I've noticed something about funnels and smokestacks on ships over the years.
In the past, a ship's smokestack(s) tended to be tall, narrow, pipe-like things, reaching high above the upper deck of a ship. Think of the SS San Mateo or the Titanic as an example of that.
Then look at a bunch of ships from the mid-20th century. funnels had been reduced to almost nothing, and what was left was wide and fat. The Kalakala, Chinook, the Sidney Class Twins, and, to a lesser extent, the V-class prior to their funnel modifications are all examples of this.
Lastly, look at today. Funnels are back in high style, tall as ever, but they are still fat. The Northern Expedition, and our Coastal Class triplets are a great example of this.
Is this occurrence due to what was in style at the time, or due to necessity?
I'm thinking that originally, funnels were tall because soot would fall all over the aft decks if it weren't for a tall funnel, or a stray spark from a ships' steam engines might ignite the ship. But that doesn't explain why funnels suddenly 'disappeared'.
Does anyone have any theories to add to this?
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Post by Ferryman on Dec 19, 2010 0:20:50 GMT -8
Generally the funnel needs to be tall, to allow for the fumes to be sent higher in the air. This lessens the chances of the smoke lingering on the passenger decks. That was the answer I recieved at least during a bridge tour of the Queen of Alberni in the 90's when I asked why they added all of those pipe extensions to the funnel.
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FNS
Voyager 
The Empire Builder train of yesteryear in HO scale
Posts: 4,948
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Post by FNS on Dec 20, 2010 0:07:40 GMT -8
Generally the funnel needs to be tall, to allow for the fumes to be sent higher in the air. This lessens the chances of the smoke lingering on the passenger decks. That was the answer I recieved at least during a bridge tour of the Queen of Alberni in the 90's when I asked why they added all of those pipe extensions to the funnel.  And, here's an example of pipe extensions on a stack. This is aboard the CHETZEMOKA on an afternoon trip to Keystone on her first day of service. "Ferryman" can show you a photo he took of the ISLAND HOME to compare the two sisters on the height of the pipes between the two. The CHETZY's pipes are higher than the IH. By the look of things, WSF's new 144-car ferries may have the highest stacks (whenever we see these come off the drafting tables and into steel construction). |
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Post by EGfleet on Dec 20, 2010 5:04:45 GMT -8
Generally the funnel needs to be tall, to allow for the fumes to be sent higher in the air. This lessens the chances of the smoke lingering on the passenger decks. That was the answer I recieved at least during a bridge tour of the Queen of Alberni in the 90's when I asked why they added all of those pipe extensions to the funnel. And, here's an example of pipe extensions on a stack. This is aboard the CHETZEMOKA on an afternoon trip to Keystone on her first day of service. "Ferryman" can show you a photo he took of the ISLAND HOME to compare the two sisters on the height of the pipes between the two. The CHETZY's pipes are higher than the IH. By the look of things, WSF's new 144-car ferries may have the highest stacks (whenever we see these come off the drafting tables and into steel construction). WSF added a few pipe extensions of their own over the years. The Jumbos have had theirs extended over the years and in the case of the Issaquahs they were added altogether. |
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D'Elete BC in NJ
Voyager
Dispensing gallons of useless information daily...
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Post by D'Elete BC in NJ on Dec 20, 2010 5:59:07 GMT -8
Generally the funnel needs to be tall, to allow for the fumes to be sent higher in the air. This lessens the chances of the smoke lingering on the passenger decks. That was the answer I recieved at least during a bridge tour of the Queen of Alberni in the 90's when I asked why they added all of those pipe extensions to the funnel. More importantly, if the stacks were too short, sparks from the coal/wood fires had a habit of landing on the ship, causing a significant fire danger for ships with wooden superstructures. Many of the old double-enders in NYC habour were notorious for what wafted back into the passenger cabins... |
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Post by Name Omitted on Dec 20, 2010 6:38:14 GMT -8
Many of the AMHS vessels had deflectors added which, while the ship is under way, creates an updraft that pulls exhaust away from the after-decks.
If you look at the QE2, the base of her funnel actually has a scoop that picks up air from forward motion, and shoots it vertically up the sides of the funnel, picking up fumes as it goes. I don't know if it's architectural Schick or not, but they repeated the process with the QM2 as well.
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