Ian Thompson

William Bronson wrote:

Ian Thompson wrote:

William Bronson wrote:I would favor the second iteration, for more more heat transfered to the inner oven.

I kinda doubt it will be an issue but it could lead to poor draw.
If it did, the solution is a bypass.

Thanks for your input. What do you mean by bypass?

Hmm, hard to put into words.
The second design will stratify the exhaust gasses, so only the gasses cooled by transferring their heat to the oven will sink low enough to exit the chimney flue.
This improves the efficient use of the heat , but thwarts the fastest flow of exhaust gasses.
This can be a problem that causes smoke back  and inefficient burning when first starting the fire,but as the chimney flue heats up, it is unlikely to be a problem.

If your flue pipe had a tee opening into the space just above the inner container, exhaust gasses could flow almost  directly into the the chimney flue.
Once the glue was hot,closing a damper located in the tee would force the gasses to satisfy.
This little added complexity l would give you the best of both designs.

This sounds interesting but I am having difficulty envisioning it. This would be part of the first proposed design?

Benjamin Dinkel wrote:Hey Ian. That is a big bunch of soon to be ovens!
I second the juice box straw layout. More time for the heat to transfer to the oven.
But if it doesn’t work or the oven gets too small than I also think that with the efficiency of a rocket burn you can allow some heat to escape. At least you don’t blow up tons of smoke into your neighborhood.

LOL.  I only acquired 4 from that bunch. It will take 2 tanks to make one oven because I will need some amount of material off a second oven to fully construct the oven. I plan making the remaining two into nice large boiling pots.  I would at least hope to get something the size of a baking dish inside the oven in the oven. It will definitely make personal sized pizzas in either size iteration.

What would be the minimum sized chimney you would use?  Should it be the same size as the riser on the rocket oven?

William Bronson wrote:I would favor the second iteration, for more more heat transfered to the inner oven.

I kinda doubt it will be an issue but it could lead to poor draw.
If it did, the solution is a bypass.

Thanks for your input. What do you mean by bypass?

So, I have embarked on a project to make a much smaller version of the rocket stove pizza oven.  The reason I am pursuing this is that the barrel oven as designed is simply too large for the space I inhabit. This smaller oven will fit on top of my Spitfire Rocket Stove which I use for camping and off-grid cooking.  This smaller version will be portable.  

I still have to work out some details of design and it will require welding, which I have access to. It will be constructed out of a modified stainless steel liquid oxygen storage container.  The total size / volume is probably 10 gallon. There is an inner and outer container with air space existing between the two containers which should allow heat to circulate around the inner container. I have included a photo of the partially deconstructed tanks with the smaller one nested.  I have also included a sketch of two possible ways I could position the inner "oven" inside the outer container?  I am seeking opinions on the best position for the inner oven. Any thoughts on this or anything else regarding the plans as laid out?

I would think that, while American hazel might be blight resistant they produce material of a much smaller diameter than the European vartiety. I mentioned before that are many blight resistant varieties to be found at Burnt Ridge Nursery. However as I understand it, most of those were developed via breeding efforts in Oregon and reportedly their resistant may not hold up under disease pressure in the east. You want stick with varsities developed closer to where developed to be resistant in the region you reside in. The Northern Fruit and Nut Growers and the Indiana Fruit and nut growers associations are a good source of info.

Anne Miller wrote:Maybe this will help:

https://permies.com/t/187579/Gal-Tinman-TLUD

Yes, quite helpful. Thank you.

Scott Weinberg wrote:yes, what Fox said!  

So it would be fine in the oven design posted above?

Fox James wrote:Ceramic fibre blanket and board is perfect for use in a standard high mass pizza oven because the product will be completely sealed between the cement dome and the outer casing.
However it is not suitable for use in a flame path when food is also present.

The design I am using is also sealed. It is a "white oven".

thomas rubino wrote:Hi Ian;
I'm sorry but I am unfamiliar with the rocket pizza oven build.
I use a Walker black and white oven for pizza making.
What part of the build do you want to use superwool in?

I am hoping I would use it, in some way, in the construction of the stove (the J-tube) itself, surrounding the burn chamber, and lining a heat riser.  In the plans provided the stove, the  combustion chamber is made of fire brick and and ceramic fiber board.  The heat riser is made of ceramic fiber board cut to shape and held in place with a metal frame.  It would be much easier and cheaper to make one  where superwool is lining a round conduit such as shown here:

https://permacultureprinciples.com/wp-content/uploads/2016/11/The-drum-style-rocket-stove-sm2-677x1024.jpg

If you go to minute 1:44 of the trailer linked to below you will catch a glimpse of the j-tube as per the original RSPO plans.  Again it is made out of firebrick for the burn chamber lined on the outside with ceramic fiber board and fiber board for the heat riser all encased in sheet metal and supported by a metal frame.  I think I would still use the fire brick and combustion chamber design but would want to use a riser lined with the Superwool rather than the straight walled ceramic fiber board.

https://youtu.be/ElPBFH8oRO4

thomas rubino wrote:Hi Ian;
Superwool is perfect when used in a riser., although after heating beyond 1400F, a mask should be used if handling a used riser.

Are you familiar with the rocket pizza oven build? What would a mod utilizing Superwool look like?