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It has begun - Page 3
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On my current build, I'm thinking of using some 8" PVC, installing it right under the serving rack/ shelf, but spraying it with black truck bed liner material first, so it will blend in with the black cooker.
Trick is, always put a cap full of bleach in the water when you fill the tank, this will keep it from growing any fungus or anything, and that tiny amount of bleach you won't tell is even there.
I got the tank on the trailer..... What a P.I.T.A. I don't have any hoists, lifts, extra person or even a big tree to hoist the smoker on the trailer after its finished so I figured that I could get it on the trailer and work from there. Im guessing that it would be easier jacking up a fire box to the cooker than to get it all put together and try putting it on the trailer. All Ill need to do is tack the FB on and roll the cooker over so I don't gotta be working upside down. That tank was heavy enough as it was by myself. Ill probably end up sliding the tank forward about 12"- 16" and cut the back of the trailer off and adjust the axle accordingly. Im glad I didn't score a 250 gal or Id never got it on there.
Thanks for lookin
Edited by MrSpooky - 3/30/14 at 2:58pm
OK, scratch all that previous crap ^^^^^^^^. I had to call in the educated one of the bunch (wife). Diggin through threads, and the 2 different calculators, we have everything figured out except for one thing. There's going to be 3.75" from the RF plate to the cook surface, Is that ok?
Yes. The tank measurements are:
W 24" 124.7% size differential
Area of FB to CC opening
92.16 X1.5 = 138.24
So that gives us 6.25" (+/-) height X 21" length for the FB/ CC opening. From what we gathered, the volume needed for the RF plate set it at 8.25". This put the RF plate 2" above the CC/FB opening. This only left 3.75" from the RF plate to the center (radius) of the CC.
***** In the circle calculator we erred on the "high side" of figures ************
Does this sound right?
There is a problem with Feldon's since it is all based on the cook chamber size. If you leave a larger firebox than is required in the calculator, it will inflate the size of the opening into the cook chamber. Where you got 92.16, the actual requirement is 73.92. Most people make it a little bigger and raise the RF plate some along with adding additional size (1.5) where the air has to make the turn at the end of the RF plate. If you cut up from the bottom of the tank 5 1/2 inches it results in an area of 78.2", bigger than needed and if you go to 6", it will be half way between the bottom of the tank and the center line so you could put your grates at the 3 o'clock position and have six inches between your RF plate and the grate. Does that make sense?
It's hidden back in post 8, he wanted a 250, got what he thought was a 150, that turned out to be a 120...
I plugged a 120 into the Feldon's link pasted above, please give my calculations a double check before he pulls out the torch!
9240 ci FB
471 ci stack
28 sq. in. FB air inlet .... can be split adding a second opening above the Fire Grate... improves temp control...
111 sq. in. FB/CC opening
111 sq. in. area under the RF plate
If the tank is 24" diameter then seg height of 7" will give 110 sq. in for the FB/CC opening and area under the RF plate... and Chord AB figures the RF plate width of about 21 3/4"
73.92" is a Feldon number and I figure 1.5 X that makes for better air flow and solves the overheated FB that some folks experience... and better and more even temps in the CC..... soooo ... 73.92 x 1.5 = 110.88 sq. in.....
All of the numbers can be adjusted a bit.... making them too small will affect the performance of the smoker... and cause headaches for the operator.... or so it seems....