My thoughts are that it prolly doesn't matter much round or square as far as circulation in a GF, especially since you are dealing with so little airflow..Texasbowhunter wrote: ↑August 4th, 2021, 9:46 amIs it really that much of a benefit to have the round CC over a square CC
Having the square or rectangular CC would certainly be an advantage in building as compared to the round CC
Thoughts
Wow sounds interesting. Must need a lot more air through it for some reason. A typical GF without a blower and a 2" ball valve will only pull approx 10 -15 cfm I am guessing through that small of an opening. My flameboss max's out at 21 CFM at 100%. It usually runs about 15% (less than 4 CFM) which keeps me at about 225 degrees. If I were to run it wide open, my smoker would likely spike at over 500 degrees. I wonder why a horizontal that small would need 1000 cfm? Man if it doesn't work you can always turn it into a forge... LOL!! post some pics when you get that thing going.Pitmaster Big D wrote: ↑August 4th, 2021, 11:14 pmThe 100cfm for blowers was not a mistake. I have been talking about one if these with Frank for a while and that was the number he came up with. I was looking at a 24"x48" tube with a gravity feed shot on the side. The BBQ Guru controller kit that is recommended for the second to largest Myron Mixon one uses 2 x 25cfm fans and the largest uses a special fan box that I have not been able to get a good look at. It has something to do with the fact that it is horizontal and not vertical. With the vertical cook chamber the heat/air has less to travel across, and natural heat rising helps the process so you can run off of just a ball valve. With a vertical it needs the extra air flow.
I'll try to tag frank and see if he can jump in with some additional info.
Sent from my SM-G998U using Tapatalk
I agree. I'm still looking into it. It's definitely something I would like to try even as an experiment.tinspark wrote:Wow sounds interesting. Must need a lot more air through it for some reason. A typical GF without a blower and a 2" ball valve will only pull approx 10 -15 cfm I am guessing through that small of an opening. My flameboss max's out at 21 CFM at 100%. It usually runs about 15% (less than 4 CFM) which keeps me at about 225 degrees. If I were to run it wide open, my smoker would likely spike at over 500 degrees. I wonder why a horizontal that small would need 1000 cfm? Man if it doesn't work you can always turn it into a forge... LOL!! post some pics when you get that thing going.Pitmaster Big D wrote: ↑August 4th, 2021, 11:14 pmThe 100cfm for blowers was not a mistake. I have been talking about one if these with Frank for a while and that was the number he came up with. I was looking at a 24"x48" tube with a gravity feed shot on the side. The BBQ Guru controller kit that is recommended for the second to largest Myron Mixon one uses 2 x 25cfm fans and the largest uses a special fan box that I have not been able to get a good look at. It has something to do with the fact that it is horizontal and not vertical. With the vertical cook chamber the heat/air has less to travel across, and natural heat rising helps the process so you can run off of just a ball valve. With a vertical it needs the extra air flow.
I'll try to tag frank and see if he can jump in with some additional info.
Sent from my SM-G998U using Tapatalk
What would be cool is to run a BP along the bottom like a regular RF smoker and attach the GF section to the side. Maybe that is what he is talking about. That'd actually be pretty awesome . but the 100 cfm still has my head scratching a bit, unless it were a 500 gallon tank or something..
Yeah please give more info on this when you find out..
That's a bunch of charcoal. that could add up quick $$. Especially if doing just for back yard enjoyment.Big T wrote: ↑August 5th, 2021, 6:42 pmIt has been done before on the forum by another member. He built a 24X67 RF cooker and he built a removeable gravity chute that he could attach to the top of his FB. He ran it without any type of forced air control device and he said that it used about 50-60 lbs of charcoal to maintain 250 degrees for about 10-11 hours. I'll post a link to his build so you can read the details but all of the pictures were lost when they updated the forum several years ago. It was a really neat looking pit. https://smokerbuilder.com/forums/viewto ... =11&t=3929
I've talked to Frank and Tom about this design quite a bit and some of the logistics are still not there quite yet. Smokerbuilder had tons of plans and some very great ones for traditional offset and standard gravity feed, but not a hybrid.Dirtytires wrote:There is a calculator on the front page of the forum. You plug in your cook chamber size and it will help you find the proper dimensions for the firebox, throat, gap, chimney and air intakes. The calculator is well tested and will result in a well tuned pit if you follow it.
Another thought is to look for a set of plans from Frank. He has quite the selection and you can be certain the pit will operate properly. As a bonus, Frank is available for consultation during your build.
My reverse flow thrives on log splits. I had a small offset that was too erratic on logs that I could only use lump charcoal but I imagine that was due to the size of the pit. The bigger offsets you see on this site will run wood splits just fine.