<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Rok good point. To each his or her own ! Your concept is great either way!! <div>Richard</div><div>Ps,. Slava Ukraine<br><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br>On Jul 5, 2022, at 5:43 PM, Ronal Larson <rongretlarson@comcast.net> wrote:<br><br></div><div dir="ltr"><meta http-equiv="Content-Type" content="text/html; charset=utf-8">Rok: and ccs<div class=""><br class=""></div><div class="">Thanks for many response, inserts below.<br class=""><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Jul 4, 2022, at 12:03 AM, Rok Oblak <<a href="mailto:rok.stoves@gmail.com" class="">rok.stoves@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Hey Ron,<div class=""><br class=""></div><div class="">2. cob is a natural material building method/ material, composed of clay, sand and straw. <a href="https://en.wikipedia.org/wiki/Cob_(material)" class="">https://en.wikipedia.org/wiki/Cob_(material)</a></div><div class="">It has good heat accumulation properties, while the straw provides some insulation and durability - so all these make a nice stove structure. Accumulation can be reduced with a fired ceramic liner,which gives a faster heat transfer to the pot and it makes it more durable as well, as the heat would crack the cob eventually. As I've written in the email, i like the notion of building an extra surface right next to the fire hole, so its like a modern kitchen stove-top, where you put your hot pots. Cob is a traditional building method in many countries and its gaining popularity in Europe and other western countries as moder building materials are getting more expensive and people are getting sensitive about the materials they implement in their houses. Natural materials would have better properties, like sound insulation, air cleaning, heat retention, etc.</div></div></div></blockquote><div><span class="Apple-tab-span" style="white-space:pre"> </span>RWL1. “Cob” (new to me) is a word replaced by (not quite the same) “adobe”.in Colorado. But now - cob looks better - no need for making and drying bricks. Some fantastic lifetimes achieved with cob construction..</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>Very surprised to see it recommended for chimneys. Clearly needs more application to stoves. </div><div><span class="Apple-tab-span" style="white-space:pre"> </span>Kevin McLean is already adding earthen “side” materials to his “Sun24” stoves - but maybe not yet in the recommended 1-3-1 ratio for cob.</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>Anyone else using cob with stoves?</div><div><br class=""></div><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class="">I recently started to collaborate at Krater, production space in Ljubljana / Slovenia, where we study natural material implementation as building materials and product design We started with invasive species of plants, like japanese knotweed and have this paper brand <a href="https://notweedpaper.com/" class="">https://notweedpaper.com/</a> We implemented invasive species in cob material, like Goldenrod and Knotweed and some others. Also made biomass briquettes from several different species. We also have a lot of clay and gravel and sand on site, so its easy to experiment.</div></div></div></blockquote><div><span class="Apple-tab-span" style="white-space:pre"> </span>RWL2: I was surprised at the biomass species that should not be used with cob.</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>Nice looking paper. I have friends who have recently begun making and selling a paper made from hemp stalks.. Lots of waste in hemp farming.</div><br class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class=""><br class=""></div><div class="">I was leading the workshop with <a href="https://27.bio.si/" class="">https://27.bio.si/</a> where we are building a tea pavillion to demonstrate using various 'wild' matrials in contemporary designs, so we have built the cob stove to show how easy and applicable it is to almost every living environment in the world </div></div></div></blockquote><div><span class="Apple-tab-span" style="white-space:pre"> </span>RWL3: There has been quite a bit of material recently on “Urban Forests”. The standard is to eproduce at least 25-30 of the original native trees for that area. Should be better tied to biochar.</div><br class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class=""><br class=""></div><div class="">I currently have some other projects on the go, but am looking for extra funds for development - if any of you happen to know for some we could apply, I'd be happy to know about. Also specifically regarding the cooking stoves, designing kitchens, etc. Richard, I have written to Nora Feldmar, but she did not reply - do you have any contacts with her still? I've had some corporate work in last 10 years but finally saved some moneys and have a small support from Slovenia government now for the next 5 years to work more on development projects.</div><div class=""><br class=""></div><div class="">3. I haven't done any char-making experiments with my stove, but Jed did in his projects, like you know already.</div></div></div></blockquote><span class="Apple-tab-span" style="white-space:pre"> </span>RWL4. How many residents around your area are heating and or cooking with wood? With charcoal production, they can make, rather than spend, money on both - and help the climate. With round briquettes, the pyrolysis front moving out radially from the central hole seems to do so very favorably, with good charcoal resulting (this per Joshua)<br class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class=""><br class=""></div><div class="">4. Funding from Finland was only for the short trip to Malawi, where I started thinking about briquette stoves, back in 2004. Than I got some support from our university in Vancouver/BC, bt that was it pretty much, apart from my master thesis on vernacular, open source design of cooking stoves in developing countries.</div></div></div></blockquote><div><span class="Apple-tab-span" style="white-space:pre"> </span>RWL5: Is your Master’s thesis publicly available? </div><span class="Apple-tab-span" style="white-space:pre"> </span><br class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class=""><br class=""></div><div class="">5. Yes, Joshua really took the idea of the Roket stove to another level! Joshua, is cob building active in your area? <span class="Apple-tab-span" style="white-space:pre"> </span></div></div></div></blockquote><div><span class="Apple-tab-span" style="white-space:pre"> </span>RWL6: Joshua has just responded in a different thread - with many changes (and recent reverse changes) in his life. </div><div><span class="Apple-tab-span" style="white-space:pre"> </span> I don’t recall Josh ever commenting on his own personal clay formula - but I doubt he is using cob - as all of his work goes through kiln firings. He will have optimized to get crack-free strengt</div><div><br class=""></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>Thanks for such a full response. We all should be doing as much as your Krater group.</div><div><br class=""></div><div>Ron</div><div><br class=""></div><div><br class=""></div><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class="">Thanks to all for the feedback!</div><div class="">Rok</div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jul 4, 2022 at 4:31 AM Ronal Larson <<a href="mailto:rongretlarson@comcast.net" class="">rongretlarson@comcast.net</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;" class=""><div dir="auto" style="overflow-wrap: break-word;" class=""><div dir="auto" style="overflow-wrap: break-word;" class=""><div class="">Rok and List: cc Joshua and Richard</div><div class=""><br class=""></div><div class=""><span style="white-space:pre-wrap" class=""> </span>1. Thanks for returning to the stoves list. Yours was a major topic of conversation many (15?) years ago.</div><div class=""><span style="white-space:pre-wrap" class=""> </span>I apologize to Richard Stanley and several others for not including their later contributions. Richard and I met at a (forgotten theme) confere4nce in Boulder maybe 20 years ago. Good to hear he also is still active.<span style="white-space:pre-wrap" class=""> </span></div><div class=""><br class=""></div><div class=""><span style="white-space:pre-wrap" class=""> </span>2. Can you expand on the word “cob” below. </div><div class=""><span style="white-space:pre-wrap" class=""> </span>Some very nice-looking stoves in your photos.</div><div class=""><br class=""></div><div class=""><span style="white-space:pre-wrap" class=""> </span>3. Many on this list are investigating. char-making stoves these days. I remember reading a little about the Roket and char-making. Anything new on the char-making front at your company? Or in your part of Europe?</div><div class=""><span style="white-space:pre-wrap" class=""> </span>I ask because char is so important for climate and other reasons.</div><div class=""><br class=""></div><div class=""><span style="white-space:pre-wrap" class=""> </span>4. At your excellent site below (<a href="https://briquettestoves.com/" target="_blank" class="">https://briquettestoves.com/</a> ) there was a nice (but to me unknown) story about your receiving funding from Finland to develop the Roket. Anything more on that we should hear? Good for the Finns!</div><div class=""><span style="white-space:pre-wrap" class=""> </span></div><div class=""><span style="white-space:pre-wrap" class=""> </span>5. There were also nice tributes to Joshua Guinto and his work with and extensions of the Rocket toward char-making and biochar. </div><div class=""><span style="white-space:pre-wrap" class=""> </span> Like you, I think Jed is the best artist in the whole stove world. And sculptor and designer.</div><div class=""><span style="white-space:pre-wrap" class=""> </span>I was especially impressed at his 2013 paper (new to me) which couples to your work. </div><div class=""><span style="white-space:pre-wrap" class=""> </span>I include him to get an update on that very advanced 2013 paper found at: <a href="https://holeyroket.files.wordpress.com/2013/05/the-holey-roket-stove-and-biochar-project.pdf" target="_blank" class="">https://holeyroket.files.wordpress.com/2013/05/the-holey-roket-stove-and-biochar-project.pdf</a></div><div class=""><span style="white-space:pre-wrap" class=""> </span>In order to keep this message only to Rokets, I am starting another separate message to Joshua.</div><div class=""><br class=""></div><div class="">Ron </div><div class=""><br class=""></div><div class=""><br class=""><blockquote type="cite" class=""><div class="">On Jun 27, 2022, at 6:17 AM, Rok Oblak <<a href="mailto:rok.stoves@gmail.com" target="_blank" class="">rok.stoves@gmail.com</a>> wrote:</div><br class=""><div class=""><div dir="ltr" class="">Dear stovers,<div class=""><br class=""></div><div class="">it's been a long time since I've written in the list, but we recently organized a Building with Earth workshop and one detail in the cob table was an integrated cooking stove - a ceramic liner, using biomass briquettes, same type as from Richard Stanley. </div><div class=""><br class=""></div><div class="">It showed up as a great update to the holey Roket stove <a href="https://briquettestoves.com/" target="_blank" class="">https://briquettestoves.com/</a> as durability is a big issue as ceramic liners tend to crack and break pretty easily due to temperature shocks, but the cob here is making it last for a long time. </div><div class=""><br class=""></div><div class="">I have mixed local found clay and a lot of fine sawdust in the liner and it doesn't make any smoke, only when you push in a new briquette, there is black fumes for a few seconds, until a new one ignites.</div><div class=""><br class=""></div><div class="">If you happen to know any projects this principle would be good to integrate, even for other types of wood, I would be happy to share my experiences and possibly collaborate on redesigning existing stoves with this alternative solution. </div><div class=""><br class=""></div><div class="">Happy and healthy cooking!</div><div class="">Rok<br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class=""><div class=""><b class="">Rok Oblak, MAA Design</b><br class=""><br class=""><a href="mailto:rok.stoves@gmail.com" target="_blank" class="">rok.stoves@gmail.com</a><br class=""><a href="http://www.holeyroket.com/" target="_blank" class="">briquettestoves.com</a><br class=""><br class="">Gregorciceva ulica 5<br class="">4224 Gorenja vas<br class="">Slovenia<br class=""></div></div></div></div>
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