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Post by Donkey on Jul 31, 2014 1:12:36 GMT -8
It's been a full summer. Lots of projects going on around here! Among them, my natural building apprentices spent a LOT of time experimenting with rocket stoves for cooking. Over the course of the last couple of months, we've built an outdoor cooking complex. First, we fixed up a small but traditional wood fired, beehive oven. Then, after using that for a time, we built a double ended stove (2 rocket stoves) for boiling/frying. This is early on in it's development. 2 rocket stoves, the one on the left began as an Aprovecho-style, horizontal feed; the one on the right, a J-tube rocket. Later, the horizontal feed was modified into a J-tube as well. Here is roughly how the internal channels go.. Notice that there's no chimney here, you can cook/heat food on ANY port up on top. For exhaust to flow out, one of the ports has to remain open; we often placed a chimney over one of the cook-top plates and cooked on everything else (simultaneously). This middle(ish) cook-port got remade into a deep pot heater with a combination chimney, chopped into the side (and a tea-cup warmer added). Yep.. We ARE using coffee cans as a chimney. Works just fine, so far! Oh, and yes.. Both stoves vent through the one chimney. notice how the pots sit deep into each "pot well", this maximises heat getting into the pots. Other cook surfaces can be used as well. After much experimentation, a few changes and some decorations later, this stove is functional and beautiful.
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Post by Dan (Upstate NY, USA) on Jul 31, 2014 1:25:29 GMT -8
Cool thanks for sharing...
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Post by Daryl on Jul 31, 2014 1:28:11 GMT -8
Wow. That is beautiful. You guys are so talented.
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Post by Daryl on Jul 31, 2014 2:58:37 GMT -8
Besides the coffee cans, is the entire build cob? I see what looks like firebrick in the pictures.
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Post by matthewwalker on Jul 31, 2014 6:52:52 GMT -8
Nice one Donkey, love it. Really beautiful cob work, and it appears to be wonderfully functional. Great job man.
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Post by Donkey on Jul 31, 2014 9:26:12 GMT -8
Besides the coffee cans, is the entire build cob? I see what looks like firebrick in the pictures. What you see are adobes, which are basically cob popped out of a brick form and allowed to dry before use. I LOVE using adobes, they take time to prepare but REALLY speed things along on build-day! The whole thing is made out of cob/adobe. The fire(s) are insulated with perlite/clay, which is the only bagged/ready-made product in the works. We are using a couple of old fire-bricks on the feed openings to meter the air..
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Post by Donkey on Jul 31, 2014 9:46:53 GMT -8
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Post by Daryl on Jul 31, 2014 11:46:56 GMT -8
Damn...you're artists!
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Post by Dan (Upstate NY, USA) on Aug 1, 2014 1:54:16 GMT -8
Glad to see your hot water idea in action with a rocket...
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Post by ronyon on Aug 2, 2014 16:23:41 GMT -8
Gorgeous! No door for the oven? Is the oven insulated ? Are these cookers protected from rain bya finish?
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Post by Donkey on Aug 2, 2014 18:45:11 GMT -8
Ronyon, I made a metal door, is it not in the images somewhere? Without the door in place, the water heater gets no heat..
Interestingly, this oven works in reverse to the traditional wood fired, pizza ovens.. Here, the heat builds AS you cook, with foods that cook at cooler temperatures going in first and higher temperature cooking happening later.. Normally, it's the other way around.
The oven has a layer of perlite/clay as insulation.
There is NOT a protective coat on these.. I need to build a roof before it rains.
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Post by Daryl on Aug 3, 2014 3:07:47 GMT -8
How long does it take for the plain cob rocket oven, without a boiler, to reach temp?
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Post by Donkey on Aug 4, 2014 9:32:23 GMT -8
How long does it take for the plain cob rocket oven, without a boiler, to reach temp? The boiler has ZERO effect on how hot the oven gets.. The boiler gets its heat AFTER it's run through the oven, a reuse of the oven's waste. Depends on what you want to cook.. Granola wants a low temp and you can start cooking it pretty much right away.. Pizza needs high temps, which takes an hour or more of firing. A very nice feature of this stove is that you can keep on firing it as you cook..
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Post by ronyon on Aug 4, 2014 12:17:19 GMT -8
Thanks for the responses Donkey!My wife is totally loving these cookers, and she wanted to know if you used a trench around the structures or a stone foundation, to avoid ground water wicking issues. Both of us are amazed and preserving the coolness is on our minds.
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Post by Donkey on Aug 4, 2014 14:12:57 GMT -8
No trench.. Just urbanite (broken sidewalk) on the ground as a moisture-break and cob on that. It seems prudent to build a higher foundation than we did. I expect some water damage down low from splash. These cookers were not originally meant to be permanent, they started out life as experimental "kick-overs". Things kinda got out of hand and now, i've got to figure out how to protect them.. They're too nice to just let go to hell..
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