First Build (from here in New Zealand!)

Horizontal smokers with a side firebox and tuning plates.
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petermac
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First Build (from here in New Zealand!)

Post by petermac » April 6th, 2017, 5:39 am

Howd'y folks, this is my first post!
I've been building this smoker (as in the pictures) with a potbelly stove as my 'firebox' - these by nature usually have a long chimney to get the necessary draw. I used the calculator and it said my 5" chimney should be 4.7" long, its about 5 feet long!

Can anyone advise me on why I should use a small chimney? ie. how is long good and how is short good?

notes:
it is an uninsulated fire.
all steel is at least 5mm thick, chamber is 6mm
legs and handles are temporary in these pictures.

I was wondering if the calculator was giving me a recommended 'minimum' length??

Thanks all
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Re: First Build (from here in New Zealand!)

Post by Rodcrafter » April 6th, 2017, 5:59 am

Welcome to the crew!

I didn't make up the calculator but I do know it is put together to draw the correct amount of draft to create the smoking environment in an offset smoker. It does have some important factors like the FB must be 1/3 the size of the CC, the throat opening is based on these 2 sizes and the stack also comes from those. If it was a calculator for a pot belly stove it would likely say run the stack through the roof.

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Re: First Build (from here in New Zealand!)

Post by petermac » April 6th, 2017, 6:44 am

Thanks!
Basically I have a 5" intake pipe and a 5" chimney with a 20" x 40" cook chamber.
The potbelly is, I think, quite small for the chamber but it sure is cranking out some heat when loaded with wood. It will fire flames into the chamber through the intake elbow.
What I want to know is "will the long chimney affect the cooker?" and how?
Regulating the fire to an even temp will be the main challenge, knowing how the chimney is affecting my setup is what I am wanting to know... ie. save me cutting the chimney 5 times and burning a trailer load of wood to find out ;)



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Pete Mazz
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Re: First Build (from here in New Zealand!)

Post by Pete Mazz » April 6th, 2017, 8:22 am

Most folks want the shortest stack that works, as long as the smokes not in your face.


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Re: First Build (from here in New Zealand!)

Post by Squiggle » April 6th, 2017, 8:32 am

:welcome:


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Re: First Build (from here in New Zealand!)

Post by Big T » April 6th, 2017, 4:48 pm

Welcome !! I believe that is the longest stack that I've ever seen on a smoker that small. How well does it perform ?


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Re: First Build (from here in New Zealand!)

Post by ajfoxy » April 6th, 2017, 6:59 pm

:welcome:
Does seem like a very long stack. I think going from the potbelly to the cookchamber and then through the stack changes the whole airflow dynamic from the potbelly alone. You might have to play around with the stack a bit to get optimal height.
It is certainly different... and interesting.


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Re: First Build (from here in New Zealand!)

Post by Pete Mazz » April 7th, 2017, 3:15 am

Only thing I've ever heard about too long a stack is the air can cool down and cause a stall but it'd probably have to be a lot longer than what you've got.


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Re: First Build (from here in New Zealand!)

Post by Rodcrafter » April 7th, 2017, 9:02 pm

I bet the extra draft is helping keep the small FB working for you. I don't have any experience but that is what it looks like to me.


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