New reverse flow build

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Blondy_UK
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New reverse flow build

Post by Blondy_UK » June 15th, 2018, 6:46 am

Hi all i am new to the site as i am looking for information regarding a new reverse flow build. Last year i built my first reverse flow from two different sized propane tanks, one for cook and the other for fire box. I used it for a couple of times with poor bitter results and realised this game is not going to be easy so did some research on fire managment and then had some better results but found i was tending the fire continuously to keep a steady heat ish. After more googling i found that one couldnt just build a smoker and that there were calculators that you must use to get somewhere near to what was needed. So this year i am building a new one using some calculations, i have most of the sums worked out but i have some conflicting info regarding offset and reverse flow offset. I read that some of the numbers had to be multiplied by 1.5 for reverse flow due to extra flow needed and the resistance to get back along the baffle plate to tje chimney. Can anyone confirm this and if so which measurments need multiplying. Thanks PJ



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Re: New reverse flow build

Post by ajfoxy » June 15th, 2018, 4:27 pm

Welcome aboard.


Learning generally boils down to "Repetition or the avoidance of pain", some people learn by doing, some by watching and some just have to pee on the electric fence.

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Re: New reverse flow build

Post by Rodcrafter » June 15th, 2018, 7:12 pm

Welcome to the crew. I don’t know where you heard that information. But the calculator is designed for offset smokers so it’s the same for both. It’s all about the draft and the baffle plate on an RF makes up for any heat loss with radiant heat.


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Re: New reverse flow build

Post by Dirtytires » June 15th, 2018, 7:35 pm

There is a lot of information out on the web. Some good and some no so much so. I have been here a while and i promise, if you follow the calculators and guidence provided on this site you will turn out a well tuned pit. This site has the experience of hundreds of pits.

Bottom line, no, dont multiply anything by 1.5....lol



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Re: New reverse flow build

Post by Big T » June 15th, 2018, 11:39 pm

:yth: :welcome:


Measure Twice.....Cut Three Times.

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Re: New reverse flow build

Post by Pete Mazz » June 16th, 2018, 3:53 am

Welcome


If it's tourist season, how come I can't shoot 'em?

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Blondy_UK
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Re: New reverse flow build

Post by Blondy_UK » June 16th, 2018, 5:29 am

Thanks for the welcome, before i found this site i was looking at Feldens calculator but i think that was designed for offsets so there was talk about multiplying some of the dimensions rf's. The calc on this site is for rf offsets, so i will take exact dimensions of my old compressor tank and put into this calculator and go from there.

I was thinking of putting a paving slab in the bottom of the firebox when its done will that help with heat retention or even protecting the bottom of the box?



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Re: New reverse flow build

Post by Big T » June 16th, 2018, 9:29 am

The bottom is actually the coolest part of the FB. I would say that building an ash pan to catch everything from falling on the floor of the FB and cleaning it out after you cook is probably the best thing that you can do to prolong the life of the FB.


Measure Twice.....Cut Three Times.

Blondy_UK
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Re: New reverse flow build

Post by Blondy_UK » June 16th, 2018, 9:48 am

I intend to have a 4"-5" gap under the fire grate so plenty of room for an ash pan. Wish i had found this site last year.



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Re: New reverse flow build

Post by Dirtytires » June 16th, 2018, 9:52 pm

Ash is superdry and will actually pull moisture out of the air making it damp. Himid or rainy climates are worse. It not cleaned out quickly, this damp ash will promote rust.

Put in an ash pan and clean it out after every use....it will last forever.



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Re: New reverse flow build

Post by Blondy_UK » August 17th, 2018, 8:28 am

Its been a while since posting and i have almost finished my build and wanted to know whats the best way to mount a chimney, i will try to add 2 sketches of ways to mount it but wondered whats good or bad aboit each one. Thanks



Blondy_UK
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Re: New reverse flow build

Post by Blondy_UK » August 17th, 2018, 8:30 am

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Blondy_UK
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Re: New reverse flow build

Post by Blondy_UK » August 17th, 2018, 8:31 am

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Re: New reverse flow build

Post by Chromeski » August 17th, 2018, 9:27 am

Both will work. I think most recomend nude straight out of the highest part of the tank, but don't take my word for it I'm still learning.
Where are the pics of your build?



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Re: New reverse flow build

Post by Blondy_UK » August 17th, 2018, 10:33 am

Yeh i like the cleaner look of the straight out of the top, i did it that way on my first build and just wanted some pros and cons on the two designs. I have taken a few pics on my phone but I am not sure how to post pics properly yet but will try to get some up.



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Re: New reverse flow build

Post by Blondy_UK » August 17th, 2018, 11:07 am

It started with a 50gal air receiver.
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Blondy_UK
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Re: New reverse flow build

Post by Blondy_UK » August 17th, 2018, 11:15 am

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Blondy_UK
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Re: New reverse flow build

Post by Blondy_UK » August 17th, 2018, 11:16 am

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Blondy_UK
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Re: New reverse flow build

Post by Blondy_UK » August 17th, 2018, 11:17 am

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Re: New reverse flow build

Post by ajfoxy » August 17th, 2018, 6:08 pm

Looking good. Coming along nicely. :kewl:


Learning generally boils down to "Repetition or the avoidance of pain", some people learn by doing, some by watching and some just have to pee on the electric fence.

Whether you think that you can, or that you can't, you are usually right. Henry Ford

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Re: New reverse flow build

Post by Big T » August 17th, 2018, 6:21 pm

:yth:


Measure Twice.....Cut Three Times.

Blondy_UK
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Re: New reverse flow build

Post by Blondy_UK » August 18th, 2018, 1:26 am

IMG_20180814_175824.jpg
Slowly but surely.
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Re: New reverse flow build

Post by Rodcrafter » August 18th, 2018, 6:57 am

Very nice


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Blondy_UK
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Re: New reverse flow build

Post by Blondy_UK » August 18th, 2018, 11:58 am

I wish i cauld have found a slightly larger CC. The wife asked yesterday why i was looking at compressor tanks on ebay and i couldnt lie, i said i was already thinking about the next build. She said "you still havent finished this one yet, and what are you going to do with the first one"?



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Re: New reverse flow build

Post by Blondy_UK » August 18th, 2018, 11:58 am

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