200 gallon RF newbie

Discussion in 'Reverse Flow' started by fcfdw, Oct 22, 2014.

  1. Im a little confused about the adjustments that need to be made to feltons calculator. Here are my specs.

    Link to BBQ Pit Calculator

    I think I need to make the firebox to cc opening 1.5x the measurement in the calculator. Is that correct?

    Also is the vent stack ok at just under 30in?

    I really have no idea what I'm doing so any help would be greatly appreciated.

  2. DaveOmak should be along soon. He is a great help in the building of a RF.

    Happy smoken.

  3. radioguy

    radioguy Smoking Fanatic


    Looks like you are on track with your calcs.  With Feldons you should make your firebox 100%, (its @ 107% now), this will give you all of the other openings / volumes.  For the calculator keep the FB at 100%, you can make your actual FB larger to accommodate ash / grates etc.  Feldons is based upon FB volume and NOT CC volume.  I made my FB 125% recommended.  From this point your FB to CC opening should be 1.5 times the Feldons size. 

    Dave O has a calc on many of his posts, I posted it below, I ran his calc / compared to Feldons (for my project) and it it is spot on to the adjusted Feldons.  I hope that makes sense.  If not Dave will be around and mop up. 

    Welcome to SMF, You are in good hands here. 

    The link in in your post is hosed, and doesn't work.  I use the "email link" at the page bottom, then post it via the link icon (little chains)  Here is the corrected link, double check your numbers. 


    DaveOmak calc

  4. Ok that makes sense. So I've got a opening area of 187.50. This is 1.5 times the recommended opening on feldons with my firebox set to 100% (25x25x25"). this will put my rf plate 9.5 " from the bottom of the tank. Ill build the firebox to 27x27x27". My next question is stack location. Should this be at the furthest end of the tank or can it be inset like at the joint between endcap and pipe?The reason I ask is that I have hemi tank ends and don't necessarily want to deal with cutting the hole on a curved surface.... although I can if it will be absolutely necessary.


    Oh and will it make a difference if the firebox is inset all the way to the pipe? the hemi end is 14" seam to end. I have a goggle sketchup of it but im not sure how to post it here.


  6. Fillin her up.

    I used a small box of TSP and a large bottle of dawn (split in halves) I filled and dumped twice... This worked really well after I cut it the smell is very faint.


  7. I ordered two of these for handles

    No BOOMS! its a pain to measure and mark on a round thing .

    I cut the alignment ring off after this

  8. All Marked out and top and bottom and corners are pre cut, and the bottom strap is on

    Doors!  After marking it out the doors didn't seem wide enough, and I wanted to be able to remove my top rack for turkeys, whole hog, etc.. I decided to split the door in the center and then strap the inside and outside.... I hope it works.

  9. This is a terrible pic and these are all out of order but you can see how its coming......

    Also I didn't read the blind weld post until today.... Oh well, black paint hides alot.

    Heres an example of the inside/outside strap for the center. You can open one at a time, or both at once, and it outta seal up nice

    Hinges. These are great for 4 bucks a piece. A real time saver and I really like the looks.

    The doors hardly sprung at all. It all fits pretty nice. I have a small gap on the outer edges between the door and the strap, a little less than an eighth, but if it leaks I plan to just weld a continuous bead there.

    Another of the internal strapping. I also strapped the top from the inside I don't really like the idea of welding the hinges to the strap, so we'll see how well this seals off.
  10. I don't have any pics of the trailer yet but its an old boat trailer. My Dads cleaning it up, replacing bearings, bushings, hitch, hardware, wheels and tires etc.. It should be lookin pretty good by the time it gets to my house. Next step is to burn it out and pick up the firebox material. This is the only material I didn't find for free. A buddy of mine let me go to his closed down fab shop and take whatever I wanted off his racks!!!! I bet I came home with $1000.00 bucks worth of stuff, all of it lightly surface rusted of course.
  11. mrspooky

    mrspooky Smoke Blower

    Lookin really good so far!!!  Id think hard about welding a continuous bead.  Heat produced from cutting the door out is more than likely the reason you have warpage. Thats the reason I got a little on my door. If you lay a hot ass bead, you might end up worse off than you already are.  Twekin and bending a little on the door straps can go along way.

  12. I was thinking about that as well. I'm not gonna get in a rush to try and fit them any better.
  13. Could someone tell me a good spacing between cooking grates I only have two and the top one will be removable to do turkeys or a whole hog or something. I'll have some progress pics up soon I drowned my phone and lost alot of the up to date photos.

  14. joe ny

    joe ny Fire Starter

    Looks great I am also working on my first build and the folks here have been great and very encouraging.  Keep up the great work and post lots of pics.

  15. lendecatural

    lendecatural Smoking Fanatic

    For the grate spacing top to bottom, most folks cook butts so figure the height of a butt and go from there, 8" should be plenty. If you have a bunch of extra material, you may want to allow for a rib/brisket configuration since they are thin but there will be a temperature difference between the heights so you would have to shuffle the meat if you were cooking on three racks.

  16. all mounted up

    these are the burners for frying and boiling and beans and breakfast and such.

    I used fireplace gas log lighter valves so they're flush mount and chrome! You turn em with a key


  17. RF plate 3/8"

    air inlet for the top of the door

    and these are the sides

  18. That's exactly what I needed Len thanks! I've got 14 1/2" to work with so I think ill split them 9 between bottom and top and 5.5 from top rack to top of cooker. That gives me 7" above rf plate to first grate is that ideal?
  19. lendecatural

    lendecatural Smoking Fanatic

    That should work just fine, don't forget a smaller upper vent on the firebox door directly across from the CC opening, it will allow you to move air through the smoker easier to help control temperatures. Looking good!
  20. One of those vents in the pictures is for the door. I just forgot to get a pic of the door itself

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