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Old 09-16-2018, 10:04 AM   #1
razorbrewer
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Default Building a Traditional Offset

So I've acquired a 500 gal propane tank and have decided to build a traditional offset smoker inspired by the smokers of Franklin, Moberg, etc. But since I've never been up close and personal with any of their builds, I'm needing some guidance on the design. It seems I've seen somewhere on the interwebs a design guide that helps you size your firebox, stack, etc based off the size of your cook chamber. But I'm not having much luck locating it, if in fact I ever came across such a thing. Can any of you kind brethren lead me in the right direction? TIA!
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Old 09-16-2018, 10:21 AM   #2
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Try the Feldon's BBQ Pit Builder Calculator.
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Old Yesterday, 10:23 AM   #3
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250 gal propane tank picked up today. Plan is to cut it in half for the firebox.



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Old Yesterday, 12:29 PM   #4
Rockinar
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Have you seen Franklins pit build video? That should help you with a lot of it. Also keep in mind Feldons calculator is just a guide not an exact science. According to the calculator the fire box should be 1/3 the size of the cook chamber. So according to the calaculator, Aaron Franklin is doing it all wrong.
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Old Yesterday, 12:42 PM   #5
razorbrewer
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I have seen it and I also picked up his book where he gives a guideline on how to build a homemade pit. Not a blueprint, but general ideas to follow on what he thinks is important in a DIY pit build.
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Old Yesterday, 12:45 PM   #6
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Scrap piece of pipe, 6.25" ID, 1/8" thick and plenty long for the stack. I had in mind an 8" diameter pipe for this but this might work...and is free. Any thoughts?



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Old Yesterday, 12:49 PM   #7
daninnewjersey
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We had a Franklin inspired smoker build this past spring. Tank is 1000 gallon and firebox is half a 250 gallon. This think works unbelievably well. I took a chance and emailed Aaron and Stacy. The were kind enough to reply with answers to my questions.

I'm no pro at building these....we had someone do it for us. He's a killer welder so if you have specific questions please feel free to PM me....
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Old Yesterday, 12:57 PM   #8
razorbrewer
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Thanks Dan! I'm not a welder either but we're in the construction business and have one or two on the payroll. This is going to be a rainy day project so will probably take a good bit of time to complete. I'm just in the rounding up materials phase right now. Do you have thoughts on the pipe I posted as the potential stack? Looking at yours, it appears to be at least a 10" pipe on your 1000 gal....is that correct?
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Old Yesterday, 01:07 PM   #9
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Quote:
Originally Posted by razorbrewer View Post
Do you have thoughts on the pipe I posted as the potential stack? Looking at yours, it appears to be at least a 10" pipe on your 1000 gal....is that correct?
I'm not an expert but I would say you should be good with that free pipe.
We have a 10" stack yes. It's heavy beyond belief. Aaron suggested 12' tall but I went with 8' since driving the 12' around might catch on any number of things. I thought I'll just add 4' of stovepipe if needed. We don't need it.
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Old Yesterday, 02:07 PM   #10
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Quote:
Originally Posted by razorbrewer View Post
Scrap piece of pipe, 6.25" ID, 1/8" thick and plenty long for the stack. I had in mind an 8" diameter pipe for this but this might work...and is free. Any thoughts?

Here's a member's Moberg. That stack looks like at least 8". If you're going to go through all the trouble of building, I would at least do it right. If you short cut, it might not draw properly or as well as it could. 6" just seems way to small for a 500. Just my free opinion...

When I stood on the trailer rails of Dylan Taylor's Austin Smoke Works 500, I would just barely touch over the top of the stack. That would put the height of that stack of around 8 feet somewhere. I don't know the diameter of it. I'd say 8"-10" though.

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Old Yesterday, 02:24 PM   #11
razorbrewer
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Quote:
Originally Posted by Rockinar View Post
Here's a member's Moberg. That stack looks like at least 8". If you're going to go through all the trouble of building, I would at least do it right. If you short cut, it might not draw properly or as well as it could. 6" just seems way to small for a 500. Just my free opinion...

When I stood on the trailer rails of Dylan Taylor's Austin Smoke Works 500, I would just barely touch over the top of the stack. That would put the height of that stack of around 8 feet somewhere. I don't know the diameter of it. I'd say 8"-10" though.

I'm actually waiting to hear back from Dylan on available times he has. If I can work it in, I plan on doing a brisket & sausage class with him before the end of the year. This build will go well into next year I'd imagine so hopefully I'll get some up close and personal time with a cooker that will help me tremendously with my build design.
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Old Yesterday, 04:15 PM   #12
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SMOKERBUILDER.COM is were I got my plans. Very detailed and helpful.
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Old Yesterday, 05:19 PM   #13
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Quote:
Originally Posted by Rockinar View Post
Here's a member's Moberg. That stack looks like at least 8". If you're going to go through all the trouble of building, I would at least do it right. If you short cut, it might not draw properly or as well as it could. 6" just seems way to small for a 500. Just my free opinion...

When I stood on the trailer rails of Dylan Taylor's Austin Smoke Works 500, I would just barely touch over the top of the stack. That would put the height of that stack of around 8 feet somewhere. I don't know the diameter of it. I'd say 8"-10" though.

That's my Moberg, the stack is nearly 9"s diameter and almost 8 ft tall.
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Old Yesterday, 09:18 PM   #14
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Feldon’s calculator is a bunch of complete bunk BS. The inputs are the wrong variables and the formulas are absurd. The output will result in a smoker that works within a reasonable size range, but it is in no way optimized or in anyway superior to other designs.

The good news is these things don’t require any precision in design. Make your firebox big enough to work in. For me that means about a 2’x2’x2’ cube as a minimum. Another 6” or more in one of more dimensions may be nice to have, but BTU wise, a firebox with half the volume will still hold a fire that will put out more than enough heat for even a very large smoker. For exhaust, you want somewhere around 5-6’ of vertical difference between your air intake and the top of the stack to have enough draft for most normal conditions. An extra foot or three won’t hurt you, but too tall will make it harder to store and trailer. For a cooker up to about 300 gallons, a 6” diameter will more than get the job done, for a 500 gallon size I would go with an 8” pipe.

The cool air coming in is more dense than the hot air leaving so the intake area can be a bit smaller than the exhaust area (about 50 sq in for an 8” circle) but for easy math I would shoot for 75-100% (38-50 sq in) give or take. The hottest least dense air is leaving the firebox going into the smoke chamber, so make that opening 50” or a little bit bigger.

That’s about it. Follow those guidelines and your smoker will have plenty of airflow to cook hot and fast and way more than enough for low and slow or mid temp smoking.
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Old Yesterday, 09:49 PM   #15
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Quote:
Originally Posted by Rockinar View Post

How is that smoker passing the 40/60 weight test for a trailer? I am assuming the firebox is insulated...
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