300 gallon my 1st build

hollomanhubbard

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Original poster

Apr 22, 2014

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• Apr 29, 2014

• #1

I'm new to the forum, but have been reading and thinking about a reverse flow smoker for some time.  I have a 300 gallon  tank, a 100 gallon tank and a trailer frame .  I'm about to jump right in and  get started.

I am looking forward to any advice I can get as the project unfolds.

Cylinder Tank 60"x40"

Firebox 24"x30x36"

Chimney 7"x36"

Firebox Intake (6) 3.5"x4"

Firebox to Cook Chamber opening is 10.3"  (233 sq. in)

Baffle plate 10.3"

Reverse Gap to Cook Chamber is 7" (245 sq in)

smokdiag.JPG

• hollomanhubbard
• Apr 29, 2014

Questions:

1.  Will the top of firebox being an inch above entrance to CC/ baffle plate have any diverse affects?

2. What is the recommended height for  the bottom cook shelf from the baffle plate?

3. Intake flow-is there any advantage to intake and the output of firebox being opposite side (as in diagram intake on the right and out on the left?) 

4. As I start to work with trailer I know I'll be asking questions regarding axle location?

 Please feel free to point out any problems or flaws that will save me some frustration

Thanks

 

daveomak

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• Apr 29, 2014

• #2

Firebox to Cook Chamber opening is 10.3" (233 sq. in)

I would make the FB/CC opening 300 sq. in. and the same for the area under the RF plate..... and the area at the end of the RF plate.... appears you used "Feldon's" calculator..... We have found that calculator has some problems...

RF plate 36.5" wide
RF plate height 12"
FB/CC opening, 12" high using a 20" radius cut out... same as the CC.... that gives a 317 sq. in. opening...

http://www.1728.org/circsect.htm

 

Last edited: Apr 29, 2014

hollomanhubbard

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Apr 22, 2014

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• Apr 29, 2014

• #3

Thanks
I recognize you from most of the reputable advice givers in all my research
So by making my opening 12 high and increasing space I'll have to exceed that area on the opposite opening (in the reverse path)?
Will this change my volume of exhaust pipe plans?
Thank you

 

daveomak

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• Apr 30, 2014

• #4

hollomanhubbard said:

Thanks
I recognize you from most of the reputable advice givers in all my research
So by making my opening 12 high and increasing space I'll have to exceed that area on the opposite opening (in the reverse path)?
Will this change my volume of exhaust pipe plans?

Thank you

Click to expand...

Feldon's is fine for most the numbers if you use dimensions that the Fire Box comes out 100%..... then add about 50% to the FB/CC opening and area under the RF plate...
Feldon's uses the FB to determine dimensions.... The Cook Chamber should be used... that's why calculate to the FB at 100%....

And the opposite end of the CC from the FB, it is a good idea to increase that opening also.... the heat/smoke has to take a 180 and that can restrict the flow...

The numbers don't have to be EXACT... this is a guideline that has worked for many folks and improved their smokers performance...
Remember, this is not a fan forced air movement system.... It is "gravity/convection" and darn near anything can interrupt the heat flow and screw up the performance of your smoker...

 

Last edited: Apr 30, 2014

hollomanhubbard

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Apr 22, 2014

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• May 5, 2014

• #5

image.jpg

• hollomanhubbard
• May 5, 2014

ok let's get started this is the cook chamber

 

hollomanhubbard

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Apr 22, 2014

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• May 8, 2014

• #6

image.jpg

• hollomanhubbard
• May 8, 2014

so here's the free trailer

 

hollomanhubbard

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Apr 22, 2014

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• May 8, 2014

• #7

image.jpg

• hollomanhubbard
• May 8, 2014

here's the free base for firebox - the lid plus four more inches of 1/4 inch and a plate across the top

 

hollomanhubbard

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Apr 22, 2014

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• May 8, 2014

• #8

Back to questions
Still looking for definitive answers on height above rf plate for cooking grate
My plate is 12 inches and I still have 28 inches to the top of cook chamber?
Would like to have three rack options

 

hollomanhubbard

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Apr 22, 2014

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• May 8, 2014

• #9

image.jpg

• hollomanhubbard
• May 8, 2014

the trailer is cut down to more manageable length and the axle moved forward

 

hollomanhubbard

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Apr 22, 2014

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• May 9, 2014

• #10

Thanks Dave
Making FB opening 12 high
180 turn 9 x 36.5
Does the exhaust need to be enlarged as well?
Cooking grate above/ from RF plate minimum/ maximum
I've got some pics up everything I've collected and getting started
Thanks

 

daveomak

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★ Lifetime Premier ★

Nov 12, 2010

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Omak,Washington,U.S.A.

• May 9, 2014

• #11

hollomanhubbard said:

Thanks Dave
Making FB opening 12 high
180 turn 9 x 36.5

Does the exhaust need to be enlarged as well? No.... all the numbers I calculate are based on the CC size....

Cooking grate above/ from RF plate minimum/ maximum ... 3-6"

I've got some pics up everything I've collected and getting started
Thanks

Click to expand...