• Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies living kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education experiences global resources the cider press projects digital market permies.com all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • r ranson
  • paul wheaton
  • Burra Maluca
stewards:
  • Jocelyn Campbell
  • Miles Flansburg
  • Devaka Cooray
garden masters:
  • Dave Burton
  • Anne Miller
  • Daron Williams
  • Greg Martin
gardeners:
  • Joseph Lofthouse
  • James Freyr
  • Bryant RedHawk

rocket technology for an oven  RSS feed

 
master steward
Posts: 26086
Location: missoula, montana (zone 4)
bee chicken hugelkultur trees wofati woodworking
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Erica,

At the last workshop (the one with the greenhouse) we were all eating lunch one day and we were talking about rocket stove stuff (as opposed to RMH stuff) which lead to talking about the "rocket" being used for and oven

Ernie said something about doing this right would be a project that would take a week to build!  Wow!  An RMH workshop takes about a day and a half of actual building.  So, this oven thing would take four times longer? 

Ernie described a whole lot of stuff that wen way over my head. 

Any chance we might get to hear a wee bit about it here?  Maybe I can read what you say ten times and it will stick in my brain better this time.


 
gardener
Posts: 1254
Location: Okanogan Highlands, Washington
251
books cat dog food preservation hugelkultur
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
We're on our way somewhere, so I'll start with a few basics and add more as need be.

An earthen oven takes about 2 days to build - more if you want to get to the finish-plaster in the same workshop. 
That's assuming you've already dug the foundation and supported it well.

In making a rocket oven, I imagine we are building the rocket-stove part into the foundation - so all the rocket burn-tunnel masonry has to be stout, square, and level, much more so than for a barrel-type rocket stove.

(You could also do an earthen oven with an improved, rocket-style chimney, but it would still be a massive amount of masonry to make everything self-supporting.)

So it's a day or two for foundation and drainage, half-a-day to practice bricklaying and then a day or two on the rocket masonry;
and then a couple of days for the earthen oven part.

It needs some drying time before you can take the molds out and finish the interior and exterior.  During this time, more work could be done on the roof, door(s), and exhaust outlet (or bench).  Or we can practice bread recipes, make some sourdough starter or friendship bread, whatever - assuming there's another oven available for practice baking....

We generally also need to build the roof, and whatever structure is going to receive the exhaust, so the whole thing doesn't melt in the rain. 

They can last a couple of years unprotected, but it's a lot of effort to invest in a project and then let it get rained on and eroded and cracked.

Interior finish is more critical than exterior, 'cause that's what will get in your food.

Ideally, we'd let it dry, smooth the interior and waterglass it, and then give it a little more curing time before firing it.

That's what I imagine.  I'm going to send this to Ernie as a personal email, and see if he has any corrections or additions to make.

Yours,
Erica Wisner
 
paul wheaton
master steward
Posts: 26086
Location: missoula, montana (zone 4)
bee chicken hugelkultur trees wofati woodworking
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
It sounds like a lot of the design is for an outdoor kitchen?

What would the duration of such a project be if there were aleady something shelter-ish?  And if there is something shelter-ish, and the ground is quite certain to be dry all year, does that vastly reduce the need for foundation work?

 
                          
Posts: 3
Location: North of France
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
It's not a "classic" one but maybe it could present some interest for you.



YC
 
Erica Wisner
gardener
Posts: 1254
Location: Okanogan Highlands, Washington
251
books cat dog food preservation hugelkultur
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

paul wheaton wrote:
It sounds like a lot of the design is for an outdoor kitchen?

What would the duration of such a project be if there were aleady something shelter-ish?  And if there is something shelter-ish, and the ground is quite certain to be dry all year, does that vastly reduce the need for foundation work?




What would vastly reduce the need for foundation work is either to reduce the mass considerably, or have an existing foundation already stout enough to take the weight.  Reducing the weight means no heat-sink except the oven/food, and a repurposed electric oven as shown in the video Celsius posted.

Celcius wrote:
It's not a "classic" one but maybe it could present some interest for you.

http://www.youtube.com/watch?v=lqvJFLS895c

YC



Having shelter already up would be a definite plus, but not many people on this continent have a kitchen built with later, massive, masonry additions in mind.
 
I agree. Here's the link: http://richsoil.com/wood-heat.jsp
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!