Looking for slim Firebrick core ideas/plans

i have finally got my hands on some firebricks, so far i only have 20 dense slim bricks, but its a good start.  im looking for ideas to LEGO these bricks together into a rocket core.  either 4" or 6" preferably, and either J-tube or Batch style.  im open to ideas, and i can and likely will end up buying more bricks anyway.  i dont want to cut too many bricks if i dont have to, but im open to any good/simple design ideas.   i haven't had much time to arrange them or toy with designs yet, but im sure someone already has a sweet layout plan to turn these bricks into a nice simple rocket.  

i can build around the proposed brick core later, and im handy with fabricating my own stuff, and this brick idea would be my 3rd rocket stove build/project.  

now please flood my brain with wonderful ideas and designs that are hopefully simple and inexpensive.  i have access to most building supplies, tools, barrels and perlite and all that, but i want to concentrate on a simple core to begin with.  

heres one of my favorite youtubers with a design i find very intriguing, just for conversation and to get BRICK topic started.  i love this little 4" design, but its not a traditional simple Jtube core like im asking for.  and my bricks are only 1.25" thick, but this is cool regardless.



input?

Try these thanks to Satamax for the scetchup drawings

thanks guys,

i guess i need to download 'sketchup' to view them?

Here is a 6" J-tube core I built for a demo a couple of years ago.  It had to be brought on site, assembled, fired up, and cooled for disassembly within one day. We did cast a riser from perlite-clay for it, so that just had to be set in place. It worked beautifully in the mediocre conditions (90 degree F April day, inadequate gap sealing, only a 5' bare stovepipe for chimney.)

All the bricks could be splits, even the bridge over the burn tunnel if the quantity was increased appropriately.
Only two bricks need to be cut, though if you are making a permanent riser from bricks, you would want to cut them down to 7" or so for easier insulation wrapping.

Glenn Herbert wrote:Here is a 6" J-tube core I built for a demo a couple of years ago.  It had to be brought on site, assembled, fired up, and cooled for disassembly within one day. We did cast a riser from perlite-clay for it, so that just had to be set in place. It worked beautifully in the mediocre conditions (90 degree F April day, inadequate gap sealing, only a 5' bare stovepipe for chimney.)

thanks glenn,
are those in order, example step 1, step 2?  i had made something similar ti figure #3 (on the left of your diagram) today...   might have to label them as "top view" or "step 1" for me perhaps?  lol thanks glenn this is exactly what im lookin for

The plan views on the left are the layers from bottom to top, starting with the floor at the bottom. Then there is a layer of splits laying flat, followed by a layer standing on edge, then the layer that forms the burn tunnel roof.

The inner dimensions of the burn tunnel are about 6" x 17", giving 6" x 6" for both the feed tube and riser, and a 5" burn tunnel roof. The burn tunnel is one brick plus one split high, or 1 1/4" + 4 1/2" = 5 3/4".

thanks glenn

im going to mark this thread/topic as "resolved" and im going to start a new topic on a simple "no tools" EZ micro batch design ive come-up with.   i hope you check it out Glenn and give me your opinion of the idea/design.  ive also took step-by-step photos of the EZ assembly (dry stacked)