<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Cool Rok, <div class="">My idea about the suggested use of a round cylindrical form for the cob is based on pure theory in consideration of the following;</div><div class=""> </div><div class="">Relative to a cube form, a cylinder can be made of much lighter material- as its walls are under equal tension. Such as 5 gallon/~20 liter pails are usually slightly tapered from open top to base which should in theory make molding/ casting the cob around the core insulative / refractory form, a far easier proposition than trying to use a square sided cube mold. Such a cylindrical exterior would also seem provide an inconsistent structural surround to the cylindrical core stove refractory liner. </div><div class=""><br class=""></div><div class="">I have never made -- much less tested-- one, so I defer to you... </div><div class="">Just sayin' </div><div class=""> Richard Stanley</div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jun 28, 2022, at 4:57 AM, K McLean <<a href="mailto:kmclean56@gmail.com" class="">kmclean56@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><div class="gmail_default" style="font-size:small">Hi Rok,</div><div class="gmail_default" style="font-size:small"><br class=""></div><div class="gmail_default" style="font-size:small">Here is a video on using the <a href="https://drive.google.com/file/d/1cHEysp4XfZheuQKXYb9kn9GIeUgwjdzq/view?usp=sharing" class="">cooking hole</a> and a video on making <a href="https://drive.google.com/file/d/1qFTEJjGhFrJ5RrA0_WJYrVSPdE-bNbOn/view?usp=sharing" class="">liner bricks</a> for the cooking hole. The cooking hole is a 25x25x25 cm hole dug in a three-stone cookstove. When fuel is piled in the hole, it burns without tending, uses less fuel and emits less smoke than in unmodified three-stone cookstoves. The following can be used as fuel: crop waste (maize stalks, cassava stems, banana peels, bean stems, etc.) any size wood except very thin twigs, elephant grass, bamboo, cow dung patties, bamboo, sawdust briquettes and more.</div><div class="gmail_default" style="font-size:small"><br class=""></div><div class="gmail_default" style="font-size:small">Please let me know if you would like an introduction to my colleague in Kasese who has extensively tested the cooking hole.</div><div class="gmail_default" style="font-size:small"><br class=""></div><div class="gmail_default" style="font-size:small">Kevin</div><div class="gmail_default" style="font-size:small">Sun24</div></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jun 28, 2022 at 1:42 PM Rok Oblak <<a href="mailto:rok.stoves@gmail.com" class="">rok.stoves@gmail.com</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 dir="ltr" class="">Hej Crispin and Richard, great to hear your reactions;<div class=""><br class=""></div><div class="">I was working with hi density briquettes in Kampala (Nguvu briquettes & coffee), but no hole as well. It also seemed the density was kind of not giving enough air, tho we got it going in the stove. I remember the machine was a huge steam thing :) <a href="https://briquettestoves.com/2009/07/17/nguvu-stove/" target="_blank" class="">https://briquettestoves.com/2009/07/17/nguvu-stove/</a></div><div class=""><br class=""></div><div class="">Richard, we used the cube mold as it was ready to go; i imagine the round would not be so easy to make and disassemble, maybe a metal barrow cut into 3 pieces. We liked the modern cube format as well :)</div><div class=""><br class=""></div><div class="">I didn't see Kevin’s square hole in the ground kinda-TLUD, can you show me a photo/link to it?</div><div class=""><br class=""></div><div class="">I will send you a photo of the big cob stove when its ready, it will take a month to dry probably! I like the fact that with cob you can make a whole kitchen bord/desk, with shelves and all, as its so nice to have a surface for pots right next to your fire</div><div class=""><br class=""></div><div class="">Cheers!</div><div class="">Rok</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jun 27, 2022 at 11:45 PM Richard Stanley <<a href="mailto:rstanley@mind.net" target="_blank" class="">rstanley@mind.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 dir="auto" class="">Rok, <div class="">Good to hear from you! Thanks as ever for your work on finding practical ways to extend the life of ceramic liners . Its an issue which has promised alot of folks as much -in terms of thermal insulation and resulting thermal efficiency as it frustrates-in terms of your mentioned issue of low structural durability. </div><div class="">Do you find it easier to use a cubic shape for the clay sand exterior? I wonder because , it seems that a simple cylindrical form would be easier to shape and use less material and still be as effective as a thermal ‘ cushion given the cylindrical shape of the rocket stove itself .</div><div class=""><br class=""></div><div class="">Richard Stanley</div><div class=""><br class=""><br class=""><div dir="ltr" class="">Sent from my iPhone</div><div dir="ltr" class=""><br class="">On Jun 27, 2022, at 7:46 AM, Rok Oblak <<a href="mailto:rok.stoves@gmail.com" target="_blank" class="">rok.stoves@gmail.com</a>> wrote:<br class=""><br class=""></div><div dir="ltr" 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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</blockquote></div><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>
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