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Author Topic: Smoke stacks question...  (Read 339 times)

g4yvm

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Smoke stacks question...
« on: October 09, 2018, 05:55:45 PM »

Stupid, but...


Ships stacks are canted aft presumably to help create a rearward flow of air even when stationary and so move the gasses and soot away from the vessel.  Right??


Is there an optimum angle therefore?


D
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Colin Bishop

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Re: Smoke stacks question...
« Reply #1 on: October 09, 2018, 06:09:52 PM »

Not necessarily correct. Many stacks are not in fact canted aft, especially on modern vessels. Other methods are used to carry the exhaust gases clear of the ship such as windscoops and other airflow directing devices.
Older warships often had canted stacks to keep smoke, fumes and heat away from the masthead control positions in front of them. Some passenger and other vessels had/have sloping stacks for simply aesthetic reasons to improve appearance but modern naval architects don't seem to bother much with that these days.
So there is no standard practice or angle.

Colin
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g4yvm

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Re: Smoke stacks question...
« Reply #2 on: October 09, 2018, 06:17:51 PM »

Thanks Colin.


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derekwarner_decoy

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Re: Smoke stacks question...
« Reply #3 on: October 09, 2018, 08:44:01 PM »

Colin is certainly correct here....Warships used this canting method to keep soot away from communications mast locations [especially where manned Crows Nests were installed]....later Radar antenna and such also benefited in a similar manner


The velocity of air/wind passing over an orifice [chimney top] of given surface area, is the same for a vertical chimney or a canted chimney


Derek   
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Derek Warner

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