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Q-talk *ON TOPIC ONLY* QUALITY ON TOPIC discussion of Backyard BBQ, grilling, equipment and outdoor cookin' . ** Other cooking techniques are welcomed for when your cookin' in the kitchen. Post your hints, tips, tricks & techniques, success, failures, but stay on topic and watch for that hijacking.


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Old 09-02-2012, 10:52 PM   #76
Foxfire
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The versatility of cooking on one or two sides is very appealing. Thanks a ton for posting!
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Old 09-02-2012, 11:02 PM   #77
Ye Olde Party Palace
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Great build!!! Looks like a keeper...
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Old 09-03-2012, 06:30 AM   #78
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Beautiful.
Excellent work.
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Old 09-03-2012, 06:39 AM   #79
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Very cool! I really need to learn how to weld....
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Old 09-03-2012, 06:50 AM   #80
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Man that is one hell of a pit. Congrats she is a beauty.
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Old 09-03-2012, 05:39 PM   #81
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@Jethro608- I did use a calculator to check after winging it! LOL! My openings were all well within acceptable levels and I built tons of tuning into it so even if an opening was a bit off I more than likely could compensate in another way. But fortunatley I didn't have to. She cooks very even accept for the two hot spots right above reverse flow opening into smoke chamber. I will make a defuser for that soon enough though. Thanks again for all the kind words.
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Old 09-03-2012, 07:14 PM   #82
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Well the heat has to come out some where.:) I don't think 5in is that much concidering all the cook space. Does the top shelf cook faster? I have never tried to cook up there and I loose that space.
I really think I'm gonna try that after I get my welder. I don't need one that big. But.... yea I do:D. How big of opening is that in your fire box? How thick is your rev. Flow plate? & how high off bottom for both?
I've got like 12 barrels on the way (free) & I was told I could...I mean I told her I was buying a hobart h 140 :D so I got ????..???
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Old 09-04-2012, 05:34 PM   #83
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Man it don't take long to bury a thread pretty deep .
Would you mind loading a few more pics.
Like how you get air in. And your tunning . I'm just fasinated with this build.
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Old 09-04-2012, 05:38 PM   #84
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How much fuel do you go thru ?
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Old 09-12-2012, 06:37 PM   #85
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So a while back when I first saw Bronc76's design, I thought it was fantastic. I'm sitting around home on medical leave without much to do, so I gleaned as much info as I could find in this thread, took some measurements of my own 55 gallon drum awaiting conversion into a UDS, did a little math with the various online smoker spreadsheets, then plugged it all into Google's free CAD software package called SketchUp, and here's what I came up with:



I took a few liberties with Bronc's original design, but did my best to come up with an actual usable model that I could someday fabricate from, or at least use as a starting point. I checked all airflow measurements against multiple calculators online so I imagine this should be a workable design. (Feel free to speak up if you notice anything amiss!)

Let's start with the firebox. I used Bronc's original dimensions, 18" x 18" x 20".



The calculators suggest 19.44 sq in of intake vents to feed the fire. I went with four 2" x 3" openings, or a max of 24 sq. in. if wide open.



In the shot below, I removed the firebox door so it was easier to see the feed from firebox to cooking chamber. Calculators suggest 51.84 sq. in. I went with a 5" x 10.5" opening, or 52.5 sq. in. There's another just like it on the opposite side for the left hand drum.



Looking into the right drum through the firebox opening:



More on the way...

Last edited by Foxfire; 09-12-2012 at 06:41 PM.. Reason: Fixed Pix
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Old 09-12-2012, 06:51 PM   #86
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Here's the inside of one of the cooking chambers. The two racks pullout and have stoppers. To lift them out completely for cleaning, you'd have to first pull up on the right handle and side it out from under the stopper.





In the next couple of shots, I removed the wall of the right hand drum to better see the interior. Bronc used a reverse flow design, so hopefully you can see all the layers. On the bottom is the chamber leading heat and smoke from the firebox. The baffle plate simply stops short of the end of the drum to create the reverse flow opening. On the model, this is a 21.25" x 2.5" opening, or 53.125 sq. inches -- that's just slightly larger than the 52.5 sq. in. opening feeding from the firebox, so just about perfect. I imagine the reverse flow plate being removable for cleaning, so it's just resting on rails on the front and rear walls of the drum, but perhaps in the real world that won't be a tight enough fit.



Below is a reverse shot of the same for a better view. Above the reverse flow plate is another level of rails that support free-sliding tuning plates. I show them here with thumbholes for sliding and adjusting, if needed. These are each 9" across.



Closeup of the tuning plates:



Cont...
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Old 09-12-2012, 06:56 PM   #87
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That looks great!!! Cant wait to see the finished unit. Good Luck!!!
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Old 09-12-2012, 07:00 PM   #88
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Bronc said he used a 4" diameter chimney, so I did the same on the model. The calculators want it to be 25.8" long but Bronc mentioned he wished they were taller. I'm not sure how tall his are on the real deal, but I went with an even 36" -- should be more than enough draft for the rest of the flow design. I intend to put some regular turn dampers on each stack so you can shut off one tank completely if you like. I also added a small shelf which I imagine would be held in place by rebar at just the right height for digital thermometer bases.



Bronc said he put a 1" oven gasket around the door openings so you can see that as the white band around the cook chamber openings. I didn't model any kind of latch on the cooking chamber doors but I'm sure they'd be helpful for an airtight closure. I didn't drop my chimney in as far as Bronc did, but probably couldn't hurt to for maximum flow over the cooking grates. I also worked in a 2" drainpipe and ball valve on the far end of each cooking chamber for easier cleaning and draining.



Can't forget the most important feature!



Huge thanks to Bronc76 for his concept! I'm going to get on building myself one of these bad boys as soon as I can!



Google SketchUp CAD software: http://sketchup.google.com/download/

Measurement Summary

Firebox: 18" x 18" x 20"
FB Air Intake: Four 2" x 3" rectangles = 24 sq. in.
FB to Cook Chamber opening: 5" x 10.5" = 52.5 sq. in.
Reverse Flow baffle opening: 21.25" x 2.5 = 53.125 sq. in.
Chimney: 4" diameter, 36" tall (about 5" inside cooker)
Total Length: 7 feet, 3 5/8"
Height to Cooking Grate: 2 feet, 7 5/8"
Top of Chimney: 6 feet, 5 5/8"

Last edited by Foxfire; 09-12-2012 at 11:44 PM..
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Old 09-12-2012, 07:10 PM   #89
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Quote:
Originally Posted by bustem55 View Post
That looks great!!! Cant wait to see the finished unit. Good Luck!!!
Thanks Bustem!
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Old 09-12-2012, 08:31 PM   #90
Daggs
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The mock up and the real deal look amazing!
Where does one find those exhaust dampers?
Is there a holy grail of smoker parts that I don't know a out.
Again this is fantastic!
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