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new 250 R.F build

moparman33952

Fire Starter
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Joined Jul 30, 2010
OK I finally got my tank this is going to be a VERY slow  build of a 250 Gal. R.F. trailer mounted smoker as I have too many projects at this time ( boat , jetski, two trailers one for the smoker other personal ) I'm saving up to buy enough metal  to build a couple trailers and get my other projects going  I will post QVIEW pics as this biuld progresses as ya'll can see I have started laying out the doors
 

dave54

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Joined Dec 12, 2009
good start

don't forget measure twice,cut once

and lots of pictures
 

moparman33952

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Joined Jul 30, 2010
Thanks Dave yes I will definitly measure more than once just laying it out so far to get an idea of how things will look I still have to drain her out agian and level her out to get a better look and finalize the measurements. more pics will follow as it progresses  i can't wait already ordered hinges and spring handles
 

moparman33952

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Joined Jul 30, 2010
Had time to do some work on my build. I got the doors cut & framed, hinges on, fire box opening cut ; left room for more cutting if needed ( learned this after cutting the door height  twice )  fire box cut and  welded up, door cut ,framed, hinges welded on bracing partially installed in the f.b. door.

hopefully gonna set the tank on the f.b. this weekend to finalize the dimensions on the f.b. opening     
 

raptor700

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Comin' along nicely 
  Are the hinges for your FB from KcK ?
 

tom37

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Looks like you are coming along nicely. I'm looking forward to seeing it progress.
 

moparman33952

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Joined Jul 30, 2010
Hey Raptor yes the hinges are from KCK  I also used them on the doors love them best of all they are greaseable. Thanks everyone for the compliments it makes me that more pumped up to work on it, now off to order more steel to fab up the grates, grate supports, charcoal box and box support, gonna make everything slide out (easy access ).. before I go for now I have a couple questions 

first is I used the pit ratio calculator and came up with the dimentions of 28"w X 6" t for the f.b. to pit opening which is for a rectangular opening. Though I realise I wont be able to get a perfect rectanguler opening and it really doesn't give options for a quarter round opening ( or I don't know how to get this dimention)  I do have room to move my f.b. up about an 1" if needed (which I think I need to ) my question is can I use these dimentions by following the contours of the tank on the sides without the 1" of extra height or do I have to raise it to compensate for the sides ( tank contour )

second question is I plan to have my R.F. plate about an 1" above my f.b. with about a 1/4" drop towards the non f.b. side  now  IF I measured everything correctly ( I hope so ) this leaves me with about 4.5- 5 "  from the bottom of the grates to the top of the r.f. plate  is this too close?? or about right??   I do plan on using the f.b. to tank cut out peice as an adjustable damper to help control airflow  as well as a damper in the exhaust stack.

thanks in advance for all your advise and recommendations 
 

raptor700

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 Just my .02  Hope it helps....
 this leaves me with about 4.5- 5 "  from the bottom of the grates to the top of the r.f. plate  is this too close??   
 That is the way I built mine, 4.5 in from the grate to the RF plate. And it works great.
  can I use these dimentions by following the contours of the tank on the sides without the 1" of extra height   
 Me Personaly, Once I cut my FB to cookin' chamber out, I used the same sq in. on the end of the RF plate. And also used the same sq in. on the exhaust stack.
 

moparman33952

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Joined Jul 30, 2010
Thanks Raptor from what the calculator came up with for the cooking chamber opening was 173sq.in. and exhaust vol. Was 1080 cubic in. Or a 6" stack at 38.2" in length. Now I admit I ain't great at math thats why I'm asking. Most of the posts on here say the rf opening should equal the cooking chamber opening and then most all say that the ratio calculator should be followed.which is why I'm asking; the more I think about your last post it makes more sense now. I shall make the necessary mods. I was just confused on the c.c. opening

Thanks Raptor
 

raptor700

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No Problem Moparman, I actually made my exhaust stack a little longer than needed. I wanted  to get a good draw threw the CC and I can always slow the draw with my damper. It's easier to slow the draw than speed it up. Once the heat leaves the stack there is no more draw!
 

tom37

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Not sure if this will help or not.

If you had a 30" dia tank and the top of the fire box was 5" up from the bottom of the tank, you would have 77.4 sq in of area. Here is a link and a pic of a circle calc that I use. Select radius and segment height, then you can look at the area in the lower boxes. I just play with the segment height number till I get the area I want.

Circle Calculator



What is the aprox. dia of the tank you are using?

I get a figure of 9 in tall and a 30 in dia tank to = 178 s in of area.
 

moparman33952

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Joined Jul 30, 2010
Thanks Tom I give this a visit,I wanted to ask and verify before i actually made the c.c. openeing. I will use this calculator to get my measurements, I had forgotten I had bookmarked this site once again thanks
 

rbranstner

Smoking Guru
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Joined Oct 18, 2007
That is going to be one heck of a smoker. I wish I had the skills and equipment to make my own smoker like that. 
 

moparman33952

Fire Starter
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Joined Jul 30, 2010
Thanks the only tools I have are a snap-on 140 amp welder, 7"angle grinder and  a 14" metal chop saw, though I am a body man by trade I do love building things as a hobby. I just bought one of them there taiwan made plasma cutters today off of ebay I hope it is a good $300 investment

Hey Tom I'm still a little confused as to the measurements in the calculator I admit I'm not exactly sure as to what I'm looking at which makes it even more confusing but if I measure 9" up from the (inside ) bottom I'm not to sure I'll have enough room. I seen in the example you provided you gave a radius of 15" and yes my tank is 30" in diam. now at a height of 9" tall for the opening that is a little under half of the 24" height of my fb seems like a lot to cut out of the fb
 

raptor700

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Just throwing this out there! When I built my 250, I measured my friends lang and it was 9" from bottom. Mr. Lang can't be wrong!!!!
 

moparman33952

Fire Starter
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Joined Jul 30, 2010
Thanks!!! just went out and re-measured things and all looks  just had a mental block a severe one at that once again THANKS
 

tom37

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9 inchs did sound like alot when I read it today but then I started thinking about it and you do have alot of volume there. Please keep us posted with progress.
 

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