# stationary RF smoker build

Discussion in 'Reverse Flow' started by spoon4589, Jun 4, 2014.

1. ### spoon4589Newbie

Need some information and direction on a stationary RF  smoker build.  I have done a little research on the different threads and have come up with some numbers.  I would greatly appreciate if anyone could tell me if my numbers are right or wrong.  It is being built out of a 150 gallon tank.  24" dia

2. ### daveomakSmoking GuruOTBS MemberSMF Premier Member

Bear with me here.... I was helping spoon on a PM because he wrote me..... Now I'm transferring this stuff here for everyone to help him out.... It is a little disjointed but all the information is here.... I think.... click on images to enlarge...

stack vol= 589.05
FB air intake= 34.65
FB and CC opening= 138.60
area under RF plate= 138.60

http://www.1728.org/circsect.htm

There is my calculator.... It's based on the size of the CC...... the circle calculator is used for the FB/CC opening and area under the RF plate and area at the end of the RF plate and the width of the RF plate.....

Try cranking numbers using my stuff and see what you come up with.....

150 x 231 = 34650 YEP... perfect...... so now you multiply that number x .017 and .004 and .001 then figure the other crap.... and use the circle calc....
The FB can be as big as you want.... 12,000 cubic inches or 20,000 cubic inches and it won't change a thing.... just more room for wood and ashes and a bigger volume for heated air.... and more uniform heat......

Click the box ..... Radius and Segment Height ED...... then keep changing the segment height ED until you come up with something close to 138.6 ..... that is the height of the AB line for the diameter of the CC..... and the height for the FB cut-out..... and the width of the RF plate is chord AB .......

You can kind of follow the numbers on my calculator sheet and see where everything fits.....

The green area (Circle Two) is a
segment.
The area of a segment equals
Sector Area Minus Triangle AOB Area

12" radius and 8.5" segment height = 143.4 segment area.... good enough for trying to get 138.6 segment area.....

Now, when cutting this stuff out, if the FB top is 1/4" and the CC is 1/4"... allow for that so the "INSIDE" measurement is 8.5".....

Last edited: Jun 9, 2014
3. ### spoon4589Newbie

Dave,  do you recommend that I cut the end of the tank flat on the side that the FB is going?

If so, will that require all new numbers?

4. ### daveomakSmoking GuruOTBS MemberSMF Premier Member

Cutting the end of the tank to flat, won't change the numbers.... The calculator is flexible.... larger openings, more exhaust, more air in, more room under the RF plate, are all better than not enough....

The most important aspect of a smoker is having it AIR TIGHT.... air in at the FB and air out the stack.... if you don't have that, you will fight the smoker more than should be necessary...

5. ### spoon4589Newbie

Ok sounds great.

If it is a round end, do I still install a plenum?

6. ### daveomakSmoking GuruOTBS MemberSMF Premier Member

The exhaust plenum is for ease in fitment.... either way...In the plenum outside the CC gives more room for food racks.......

7. ### spoon4589Newbie

ok got it.  Thank you Dave.