[Stoves] Briquette stove in cob

Rok Oblak rok.stoves at gmail.com
Thu Jun 30 10:39:25 CDT 2022 

Hey Richard, good points! I think its on every maker that can decide on their own how to make it, whatever they found easier and/or more efficient/ better looking etc

Remember Jed was making fish and trucks, selling and looking more attractive than cubes or cylinders :)

> On 30 Jun 2022, at 00:04, Richard <rstanley at mind.net> wrote:
> 
> Cool Rok, 
> My idea about the suggested use of a  round cylindrical form for the cob is based on pure theory in consideration of the following;
>  
> 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.  
> 
> I have never made -- much less tested-- one, so I defer to you... 
> Just sayin' 
>     Richard Stanley
> 
> 
>> On Jun 28, 2022, at 4:57 AM, K McLean <kmclean56 at gmail.com> wrote:
>> 
>> Hi Rok,
>> 
>> Here is a video on using the cooking hole and a video on making liner bricks 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.
>> 
>> Please let me know if you would like an introduction to my colleague in Kasese who has extensively tested the cooking hole.
>> 
>> Kevin
>> Sun24
>> 
>> On Tue, Jun 28, 2022 at 1:42 PM Rok Oblak <rok.stoves at gmail.com> wrote:
>>> Hej Crispin and Richard, great to hear your reactions;
>>> 
>>> 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 :) https://briquettestoves.com/2009/07/17/nguvu-stove/
>>> 
>>> 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 :)
>>> 
>>> I didn't see Kevin’s square hole in the ground kinda-TLUD, can you show me a photo/link to it?
>>> 
>>> 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
>>> 
>>> Cheers!
>>> Rok
>>> 
>>> 
>>> 
>>> 
>>> 
>>> On Mon, Jun 27, 2022 at 11:45 PM Richard Stanley <rstanley at mind.net> wrote:
>>>> Rok, 
>>>> 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. 
>>>> 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 .
>>>> 
>>>> Richard Stanley
>>>> 
>>>> 
>>>> Sent from my iPhone
>>>> 
>>>> On Jun 27, 2022, at 7:46 AM, Rok Oblak <rok.stoves at gmail.com> wrote:
>>>> 
>>>> 
>>>> Dear stovers,
>>>> 
>>>> 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. 
>>>> 
>>>> It showed up as a great update to the holey Roket stove https://briquettestoves.com/ 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. 
>>>> 
>>>> 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.
>>>> 
>>>> 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. 
>>>> 
>>>> Happy and healthy cooking!
>>>> Rok
>>>> 
>>>> -- 
>>>> Rok Oblak, MAA Design
>>>> 
>>>> rok.stoves at gmail.com
>>>> briquettestoves.com
>>>> 
>>>> Gregorciceva ulica 5
>>>> 4224 Gorenja vas
>>>> Slovenia
>>>> <IMG_1230.jpg>
>>>> <IMG_1191.jpg>
>>>> <IMG_1161.jpg>
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>>> 
>>> 
>>> -- 
>>> Rok Oblak, MAA Design
>>> 
>>> rok.stoves at gmail.com
>>> briquettestoves.com
>>> 
>>> Gregorciceva ulica 5
>>> 4224 Gorenja vas
>>> Slovenia
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