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Post by nixsee on Dec 26, 2020 12:19:17 GMT -8
That looks like a much larger system than 3", no? And its just a normal L tube rather than a Batchbox, right?
I've had success with normal L tubes ranging from 3 to 8" with a variety of basic/scavenged materials. My goal now is to standardize the design into a cheap, durable, easy to make, compact, versatile cooking device. The hardest part is getting sufficient fire to heat a 60cm ceramic "comal" for making tortillas while also having the heat well distributed across it rather than focused on the center - all while being in a short package. I've got confidence that some concepts from the the BBR and DSR2 will make it possible!
The skp file appears to be a dmg file - is there another file that you can send that works with Sketchup? Thanks!
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Post by roelof on Dec 26, 2020 13:13:13 GMT -8
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Post by bombadyl on Jan 6, 2021 4:04:04 GMT -8
Stoker, I built a 3.125 inch system size batchbox rocket per the Peterberg dimensions in the x,y plane. But I extended the depth by 4.5 inches to allow for more reasonable fuel length. It was the core of a cookstove so needed to be able to light it and walk away rather than tend it like a j-tube. The reason I went down to a 3.125 inch system size was because I was working backward from heat riser height. I'm going from memory when I say I think it was a 35 inch riser. It burned for approximately 45 minutes from full to embers, same or only slightly less than the larger sizes. It was made with castable refractory and performed brilliantly. It put out a tremendous amount of heat. Riser height was still much too low by my standards. Flames extended approximately 24 inches above the riser in full burn. Lengthening the burn chamber and lighting from the front probably volatilized more gasses, more quickly than is ideal. In this case, because it's used in a cook stove, the flames are heating a fire brick top. I was planning modifications to eliminate them hitting such a heat sink knowing this would cause creosote buildup. My job took me out of the country on short notice, so I never got around to the disassembly and rebuild. Some details are at Matt's site, I don't think I posted here because everything was still experimental at that time. www.permsteading.com/viewtopic.php?f=6&t=467If you have any questions I'll do my best to answer from memory. C
I know this post is getting old but if you are still around , i would be very interested in seeing pictures of your stove ! I tried the link you gave but I cannot see the pictures anymore...
Thanks !
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Post by bombadyl on Jan 6, 2021 4:13:44 GMT -8
I'm just arriving here now, looking to probably make a 3" system for cooking as I'm limited by riser height. Has anyone made any progress with these small designs? What about running it in open-mode, with no door or channels? I'm trying to make it as simple and cheap as possible to help extremely poor people in the developing world. Thanks!
I am also looking for a small and simple design, but not for the same reason : my constraint is being able to transport the building materials to the top of the mountain ! I have just posted a new thread to describe what i intend to do (unless someone tells me it is a bad idea).
I will be happy to follow your progress as well, as we could use similar solutions in the end...
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Post by bombadyl on Jan 6, 2021 4:21:19 GMT -8
Hi nixsee, some years ago I spend a lot of time figuring out a version of the batchrocket that was as small and as cheap as possible. Like yours, my intentions were to make it available to poor people. It resulted in a 4" version, you can find it on my website roquetinho.eu. One year ago I made an even smaller 3"-version, with just a piece of glass instead of a door ( it's on youtube). For the second winter now it's keeping me warm in my 13 m2 caravan. But it does have some issues. I have to use an electric blower to heat up the pipe, in order to get an initial draft when I start up the stove. And although cleaner than any traditional woodstove, it doesn't get as clean as a batchrocket is supposed to be, due to the volume of the fire that doesn't get large enough to reach 1100 ºC. So I guess a 4" system is the smallest possible batchrocket, if you want the clean properties. My next project is an even simpler to build 4,5" (115mm) stove, if you're interested I can send you the Sketchup-file. Roelof Very interesting work roelof , thanks for sharing !
A lightweight version of the roquetinho would be perfect for me (just need to remove 400Kg  )!
But i will definitely follow your guidelines on refractory concrete casting for the core !
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