building my first RF smoker with round fire box

forty_creek · Post by **forty_creek** » July 16th, 2015, 10:29 pm

Strong Work jsides!

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Post by **Rodcrafter** » July 17th, 2015, 8:32 pm

Heck yeah you're doing good work. I'm glad to see another Texan building heavy cookers.

Making memories.

jsides1947 · Post by **jsides1947** » July 23rd, 2015, 5:03 pm

My two pipe overlap is 4.61" and point to point length of 12.50" my bp segment height of 3.75" do I transition a short piece of my bp from the two pipe overlap of 4.61 to my bp height of 3.75" of about one inch then continue the 3.75" to my pb gap.

Post by **Pete Mazz** » July 23rd, 2015, 6:04 pm

Where did the BP height come from? Usually the BP is installed at the top of the throat opening, in your case 4.6". Using a 19" tank, the midpoint is 9.5" and that'll leave you almost 5" from the BP to your bottom rack. Seems OK.

jsides1947 · Post by **jsides1947** » July 24th, 2015, 7:12 pm

The 3.75"segment height came from the calculator for cylindrical tank with throat area of 42.19". And the 4.61"tank to tank overlap is from the calculator from overlapping two cylindrical tanks. Which pb height do I use

forty_creek · Post by **forty_creek** » July 24th, 2015, 8:30 pm

Im pretty sure even w/ using a cylinder for a FB you would still use the top of the throat height in the CC as your benchmark for your BP. So you won't choke down the air flow.
I'm not clearly picturing your dimensions. If I'm understanding you right your BP height is 3.75". Which is BP to bottom of CC? If so it sounds to low... But the "overlap" of the tanks is throwing me off. I'm not clear on what the overlap is. I haven't ran your pit calc numbers.
jm2cw
Disclosure: I am from LA...so I might have completely misunderstood your dimensions.

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Post by **Pete Mazz** » July 25th, 2015, 3:18 am

I ran your numbers thru all the calcs.

CC = 13,969
FB = 19.25 D x 17" long = 106%
Throat = 40 sq in
Throat cut-out = 4.7" h x 12.6" w

The only time I see 3.75" cut-out Ht is the Throat calc for cylindrical tanks but that calc is for using a squared FB, not another cylinder such as your case.

If I'm following you correctly, your BP Ht should be at the top of your throat opening at 4.7" from the bottom of your tank. If your bottom rack is at the midpoint of your CC (19.25" D) at 9.5" H then you'll wind up with approx. 4.8" between them, which is plenty.

forty_creek · Post by **forty_creek** » July 25th, 2015, 9:45 am

Yea what Pete said

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jsides1947 · Post by **jsides1947** » July 25th, 2015, 12:34 pm

Thanks for your help Pete, I did run the calculator for a square firebox and came up with the 3.75" sagment height this is were it came from. Then I ran the calculator for the two tank overlap an got the 4.61". I just didn't' know which height to use. Thanks for helping me out. I will use the two tank overlap 4.61" for my bp height. I have already welded my pipes together.

Post by **Pete Mazz** » July 25th, 2015, 1:57 pm

jsides1947 · Post by **jsides1947** » July 28th, 2015, 7:29 pm

On my round firebox 19.25" dia x 17" long I need 14.84 inches(2) of air intake. would you put a butterfly damper in the firebox door towards the bottom, Or slide intakes on the firebox door, or cut inlets on each side of the firebox. what would work the best. Intake area(in2) 14.84 in2, Dose this mean I need two air inlets this size? for example 2in wide x 7 in long = 14 sq in.
Thanks

Post by **Rodcrafter** » July 28th, 2015, 8:38 pm

It only means square inches. I like having them on two sides the best. It helps because of wind and even burns. But I have only one in the door on one of my current cookers. It works too.

Making memories.

jsides1947 · Post by **jsides1947** » July 28th, 2015, 9:26 pm

Thanks Rodcrafter
I have learned so much building my first RF cooker cannot wait to see how it cooks.

forty_creek · Post by **forty_creek** » July 28th, 2015, 9:29 pm

I've got em on the sides and on the door. Thought I would just cover for all weather events...lol

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Post by **Rodcrafter** » July 29th, 2015, 2:06 pm

FC you're just an over achiever lol. The size of your rig you may need all three

Making memories.

forty_creek · Post by **forty_creek** » July 29th, 2015, 9:31 pm

RC- I'm just trying to follow in your footsteps! The Legend!

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Post by **Rodcrafter** » July 30th, 2015, 6:25 am

Boy FC don't let DC see that title "The Legend" he will think I'm trying for "Czar" status. :explode2:

forty_creek · Post by **forty_creek** » July 30th, 2015, 7:52 am

Well:

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Post by **Rodcrafter** » July 30th, 2015, 9:08 am

Point taken! But my wife made me wear that.

Rev.Mike · Post by **Rev.Mike** » July 30th, 2015, 3:31 pm

lol theres only one czar, but Rodcrafter legend has a nice ring to it

Post by **Rodcrafter** » July 31st, 2015, 2:50 pm

Oh no!!! Mike, FC doesn't need any help. You know DC is gonna spam hammer me or something. lol

Rev.Mike · Post by **Rev.Mike** » August 3rd, 2015, 3:23 pm

jsides1947 · Post by **jsides1947** » August 31st, 2015, 11:54 am

I have a question about my BP Gap. I know the BP Gap needs to be 75%-100% of my throat area. I am starting to install my BP and need to get it right. My throat area is 40.0 sq inches and 75% of 40 is 30 sq inches. My BP is 16 7/8 or 17" wide. So if 17 x 1.75= 29.75 which is 75% of my throat area, the measurement of my BP gap will be 1 3/4 inches, from the end of my BP to the flat end of my cooker, length x width. Is this how you get this BP gap.

Post by **Pete Mazz** » August 31st, 2015, 1:57 pm

jsides1947 · Post by **jsides1947** » August 31st, 2015, 2:59 pm

Thanks Pete
Just wanted to make sure before I weld it into place, Thanks again for ALL your Help

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