Idea to use J tube for oven

[adiel]

hi guys

would appreciate your thoughts on this -
www33.zippyshare.com/v/85840862/file.html

thanks!

[matthewwalker]

Interesting idea Adiel. I fear that if you opened the oven door you'd lose the draft and the J would flame up out of the feed. Also, if your exhaust isn't low enough, the gasses will stratify and the lower part of the oven will be quite cool. That said, I'm sure there is a way to get it to work.

[Dan (Upstate NY, USA)]

I saw it as a white oven not a black, I donno it could be done either way.

[adiel]

it was design as a black oven

matthew - what do you think of this -
www5.zippyshare.com/v/19955015/file.html
i added a bypass that can be opend when you open the door.
and changed it to a half berrel that can be coverd with mass and clay perlight. it gives room to go down like a manifold at the end.

can anyone point out to the best oven on j design?

[matthewwalker]

I think that type of design is going to be very difficult to control the temp, although it might be quite stable at what ever temp it settles in at. In other words, I think it will be good for one temperature but probably hard to get much variation in cooking temps. So, if you only want to make bread, you could probably tune it to settle in at whatever temp you liked.

I love putting an oven right on top of the barrel, above the riser, with an adjustable opening into the bottom of the oven. It's incredibly controllable, has a broad working temp range, is quick to heat, and works very, very well. If you give the gasses an alternate path like in this design, you'll be pleasantly surprised to find that due to negative pressure in the system when it's all running, there is very little unwanted leakage into the oven when the baffle is closed. So, you can heat it all up with a blast from the top of the riser, then shut down the opening while cooking so you don't char your food. It works very, very well.

Here's the basic idea:

Lower unit:



Burner control:



Cooking over a diffusion plate made of insulated refractory with a pizza stone on top:



Pizza!

[adiel]

wow looks great!
so let me get this clear -
its a black oven ( i saw ash. how do you dill with it?)
made out of insulative material (?)
with insulation blocking the stright fire and a thin fire brick on top
right?

and in contineu to what wolf said -
www28.zippyshare.com/v/27510176/file.html

[matthewwalker]

Yes, although I made the oven in layers and tried to mimic the function of a larger wood fired traditional oven. So, a layer of high density, non insulated inside, then insulated on the outside.

Ash is always a problem when cooking over the riser, but by using this method I've found that most of the ash settles out in the lower barrel, and very little makes it out of the small 4" hole into the oven. The 4" hole in the barrel is typically mostly or completely closed while cooking, and ash is not a problem in my experience. That is one of the big reasons I feel that this is the best rocket cooking set up I know of. Fly ash is always a problem and this design gives the ash a chance to fall before the gasses enter the cooking chamber.

You have the configuration right, exactly. Insulated diffuser, thin stone cooking surface.

[adiel]

ok
another q - how fast an you make a pizza from lighting the j? isnt the insulation layer and another layer makes it slow?

[matthewwalker]

I was hoping someone would ask! This one is sitting on a really crude L shaped burner I used for burning branches and yard waste, so don't mind the smoke. I usually use it on a better core, but, this will give you the idea... Oh, it could have been quicker if I had the pizza already made, the oven was ready while I was inside forming the dough and putting it all together.

[adiel]

matthew -
looks realy good!
what do you think about this option?
www2.zippyshare.com/v/99567021/file.html
and - you made the opening 4" compering to 6" csa of the riser. would you say that 7" riser will ask for 5" opening?

[matthewwalker]

That design looks great Adiel. I think your sizing will work well, the whole process is fairly forgiving. As long as the opening on top is adjustable, you should be able to tune it as you go. Please show us what you come up with when you get it built!

[docbb]

Apr 23, 2014 14:38:37 GMT -8 adiel said:

hi guys

would appreciate your thoughts on this -
www33.zippyshare.com/v/85840862/file.html

thanks!

May be have a look at these pages


part 1
part 2
movable demo

and this one in japanese-english-google tanslation