Math for Rocket Oven

So to do any of the cooking on a rocket bb you need access to a rhm. I don't know anyone in my area with one that means I'll have to build one. So today I bought some fire bricks and am dry fitting them together to see what I can make the bricks are 2.5*4.5*9 inch so just laying them together I'd have a fuel chamber 2*4.5*9 the burn tunnel would be 4.5*4.5*13 and the exhaust would be 2*4.5 and how ever tall it would need to be. I see alot about 6in and 8in rockets. And am trying to find if that's the inner dementions like I just gave so I need to build much bigger or the outside ones and I'm fine.

Hi Aurora,

When I got a notification of a new post here, I headed over excited to see who else had logged their build. LOL
This page is for the BB submissions for a J-tube Rocket Mass Heater see details at the top of the page!
You probably need to move over to another forum.
As far as I know you don't need a RMassH for the cooking badges, you need a Rocket oven or rocket hob/J tube
My understanding is that the smallest (and still efficient) J tube is 6" square, and that the dimensions, whatever they are need to be the same for feed tube, burn chamber and chimney, but head to the building forum for expert help, and to the specific cooking BB for advice there.
Regards and best of luck
Lesley

Aurora said, "So to do any of the cooking on a rocket bb you need access to a rhm. I don't know anyone in my area with one that means I'll have to build one.

Leslie said, "As far as I know you don't need a RMassH for the cooking badges

Leslie is right as there are lots of badges for cooking.

Here is the Food Prep and Preservation Forum where cooking is found:

https://permies.com/f/404/pep-food-prep-preservation

Is it that you want to learn cooking on a RMH?

I saw somewhere that you want to use a dutch oven and a haybox cooker so I thought this thread might be of interest:

Christopher said, "haybox chili, and today haybox sweet potato stew.

https://permies.com/wiki/150055/pep-food-prep-preservation/Soups-Gallon-food-straw-soupsfour#1327951

Hi Aurora, I think that's normally the inside dimensions but for a simpler rocket stove, I don't think it matters much.  I'd dry stack it in whatever arrangement you think might work and try it out!