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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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07-05-2014, 05:31 PM | #1 |
Found some matches.
Join Date: 06-26-14
Location: DFW/29Palms
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Can someone look over my math?
Thanks in advance for any constructive criticism! I am starting a build on a 110GA propane tank.
CC volume = 25410 cu. in. actual FB volume = 8470 cu. in. recommended Chimney volume = .05 x 9680 = 484 cu. in. ( 4" ID stack X 38" tall above the CC ) FB to CC recommended opening = .008 X 9680 = 78 Sq. in. ( 12" r x 5.5" height ) RF plate area 78 X 1.5 = 116 sq. in. ( 12" r x 7.25" height ) |
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07-05-2014, 11:00 PM | #2 |
Found some matches.
Join Date: 06-26-14
Location: DFW/29Palms
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Man, 77 views and no help!?!
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07-05-2014, 11:04 PM | #3 |
Full Fledged Farker
Join Date: 04-26-11
Location: Beresford, SD
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I dont have a clue on the design and numbers end of it but looks like you figured it out. Just build it and smoke it up!
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B & T's BBQ Catering and Vending |
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07-05-2014, 11:05 PM | #4 |
Babbling Farker
Join Date: 04-19-13
Location: Live Oak, Texas
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Is this derived from a smoker calculator?
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55 gal.UDS stick burner mini WSM red Thermapen There are two kinds of countries in the world, those that use the metric system and the one that sent men to the moon and back. |
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07-05-2014, 11:09 PM | #5 |
Found some matches.
Join Date: 06-26-14
Location: DFW/29Palms
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The numbers were, but not the cut out for the tank. I am asking if the numbers jive with my layout. Thanks in advance.
http://www.feldoncentral.com/bbqcalculator.html |
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07-05-2014, 11:17 PM | #6 |
Babbling Farker
Join Date: 04-19-13
Location: Live Oak, Texas
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I don't know the formula for calculating the area of a partial circle like that. What I did on my cut out was to draw a 1" square grid pattern on a piece of paper, then drew the radius of the bottom of my CC, then counted the number of squares to match what Feldons said I needed. Hope this helps, it's all my simple mind could figure.
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55 gal.UDS stick burner mini WSM red Thermapen There are two kinds of countries in the world, those that use the metric system and the one that sent men to the moon and back. |
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07-05-2014, 11:25 PM | #7 | |
Found some matches.
Join Date: 06-26-14
Location: DFW/29Palms
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Quote:
Thats a good idea. Thanks! |
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07-05-2014, 11:29 PM | #8 |
Babbling Farker
Join Date: 04-19-13
Location: Live Oak, Texas
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It worked for me. I tried looking up online how to do it mathematically and it was way over this country boy's head.
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55 gal.UDS stick burner mini WSM red Thermapen There are two kinds of countries in the world, those that use the metric system and the one that sent men to the moon and back. |
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07-06-2014, 06:08 AM | #9 |
Full Fledged Farker
Join Date: 03-19-12
Location: waxhaw,nc
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All your calculations match the pit calculator. The only thing is the reverse flow plate should be even with the firebox. I would raise the fire box to height of RF plate. I built my RF smoker 1 1/2 years ago out of a 250 gallon tank. I used the same pit calculator. Everything came out and works great . I put a rack in the fire box at 4" high. I have my intakes under the rack. So air goes through the fire . I believe it gives you a better burning fire. Also it is always better to go bigger with your openings . I have adjustable vents on my intakes and leave the exhaust wide open. Control temp by intakes. Remember it is all about the draft. If you can not get the right draft the pit will not get up to temp. Also I made the mistake to take my exhaust to my first grate level. Bad idea , I had to cut it off to the top of the tank. From top rack to bottom rack I had a 70 degree difference. Once I cut it off , I am not more than 10 degrees. Here is a link to my build video.
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2- 22.5 WSM , 150 Gallon Offset , 250 Gallon Reverse Flow |
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Thanks from:---> |
07-06-2014, 09:08 AM | #10 | |
Found some matches.
Join Date: 06-26-14
Location: DFW/29Palms
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Quote:
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07-06-2014, 11:46 AM | #11 |
Babbling Farker
Join Date: 04-19-13
Location: Live Oak, Texas
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Nice build buttburner! Enjoyed the video. One question re: smokestack location, is there a reason behind your decision not to center it on the c.c.?
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55 gal.UDS stick burner mini WSM red Thermapen There are two kinds of countries in the world, those that use the metric system and the one that sent men to the moon and back. |
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07-06-2014, 12:24 PM | #12 |
is one Smokin' Farker
Join Date: 03-02-07
Location: Pine Bluff, Arkansas
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One thing to consider is the ultimate temp you wish the cooker to achieve.
Most cookers are designed to cook at around 250. That's where my lang 84 is happy. If I were to remodel it I would increase the firebox size by maybe 50% and place the door on the side so the intake vents could be located in the back like a Geer. Also I would place two 6 inch vent stacks and make the intake vents 100% larger. Ben Lang advises cracking the cooking chamber doors and opening the firebox door to get to 300. Many people are cooking higher than in the past and I would like for my lang to do so. I am seriously considering a redesign. |
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07-06-2014, 01:19 PM | #13 |
Full Fledged Farker
Join Date: 03-19-12
Location: waxhaw,nc
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I off centered stack due to I left the original hooks on tank so I could lift and put on my trailer. It is not that far off center and I have no issues.
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2- 22.5 WSM , 150 Gallon Offset , 250 Gallon Reverse Flow |
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Thanks from:---> |
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