<div dir="auto">Hi Norm,<div dir="auto"><br></div><div dir="auto">Thanks for doing the testing. Please don't feel limited to corn stover if you are having trouble sourcing it. We've had success with woody biomass bigger than thin twigs. So long as air can circulate and the fuel is dry, it should burn well.</div><div dir="auto"><br></div><div dir="auto">This seems to be an important development. Several African colleagues have told me that twigs and small branches are very abundant and have no other use. They are either burned or left to rot. And they burn longer in the cooking hole than maize stalks. We may find that maize stalks not needed in some areas. </div><div dir="auto"><br></div><div dir="auto">Kevin </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jun 22, 2022, 8:45 PM Norman Baker <<a href="mailto:ntbakerphd@gmail.com">ntbakerphd@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">Like all of you, I too became interested in Kevins hole in the ground for cooking. From what I can tell in the videos iot does perform well for a simple and direct as it is. I am not a stove person but am interested in big TLUDs simply for creating biochar. Intuitively, I see some conditions for good combustion like good air circulation even down in the hole between the corn stover stalks. That said, I volunteered to Kevin to do an emissions test when we go to Aprovecho later this year. Unfortunately I collected just enough corn stover to do a few burns . But this includes one burn with dried stover and only two burns with stover at ambient relative humidity. As all of you know, moisture content is critical to a clean burn. I will also be reporting moisture content. Going to be interesting.</div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">Norm</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jun 22, 2022 at 10:04 AM <<a href="mailto:stoves-request@lists.bioenergylists.org" target="_blank" rel="noreferrer">stoves-request@lists.bioenergylists.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Send Stoves mailing list submissions to<br>
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Today's Topics:<br>
<br>
1. Re: Improved 3-stone stoves (Graham Knight)<br>
2. Re: Improved 3-stone stoves (K McLean)<br>
3. Re: Improved 3-stone stoves (K McLean)<br>
4. Re: ***SPAM*** Cooking Hole Modification to Three Stone<br>
Cookstove - Update (Crispin Pemberton-Pigott)<br>
5. Re: ***SPAM*** Cooking Hole Modification to Three Stone<br>
Cookstove - Update (<a href="mailto:briancady413@yahoo.com" target="_blank" rel="noreferrer">briancady413@yahoo.com</a>)<br>
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----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Wed, 22 Jun 2022 10:48:42 +0100<br>
From: Graham Knight <<a href="mailto:biodesigndiy@gmail.com" target="_blank" rel="noreferrer">biodesigndiy@gmail.com</a>><br>
To: Discussion of biomass cooking stoves<br>
<<a href="mailto:stoves@lists.bioenergylists.org" target="_blank" rel="noreferrer">stoves@lists.bioenergylists.org</a>><br>
Subject: Re: [Stoves] Improved 3-stone stoves<br>
Message-ID: <<a href="mailto:b8a4ad3b-f76b-1fd2-6952-30ae5fad55b1@gmail.com" target="_blank" rel="noreferrer">b8a4ad3b-f76b-1fd2-6952-30ae5fad55b1@gmail.com</a>><br>
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<br>
Dear Stovers,<br>
<br>
I am much puzzled by the correspondence concerning digging a hole, etc. <br>
under a 3-stone stove!!<br>
If you put fuel into a hole it will certainly burn more slowly with the <br>
restricted combustion air.<br>
It will therefore give less heat per minute to the cooking pot.<br>
How long for the pot to come to the boil, if ever?<br>
<br>
Graham Knight<br>
<a href="http://biodesign20.co.uk" rel="noreferrer noreferrer" target="_blank">biodesign20.co.uk</a><br>
<br>
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<br>
Message: 2<br>
Date: Wed, 22 Jun 2022 12:13:31 +0200<br>
From: K McLean <<a href="mailto:kmclean56@gmail.com" target="_blank" rel="noreferrer">kmclean56@gmail.com</a>><br>
To: Discussion of biomass cooking stoves<br>
<<a href="mailto:stoves@lists.bioenergylists.org" target="_blank" rel="noreferrer">stoves@lists.bioenergylists.org</a>><br>
Subject: Re: [Stoves] Improved 3-stone stoves<br>
Message-ID:<br>
<CALxcr-u=0qRdnHp8=<a href="mailto:a-3-rH0iLgn%2B3s7tVc5zeGAb8-ptZR_DQ@mail.gmail.com" target="_blank" rel="noreferrer">a-3-rH0iLgn+3s7tVc5zeGAb8-ptZR_DQ@mail.gmail.com</a>><br>
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<br>
Dear Graham,<br>
<br>
The best I can do is tell you the cooking hole works. Smarter people can<br>
tell you why<br>
<br>
The cooking hole was something of an accidental discovery. We were working<br>
with the top down burn of crop waste, which works wonderfully.<br>
<br>
I wanted to try the top down burn in a three stone cookstove but there is<br>
little room under the cookpot. So we dug a hole for the fuel. I was not<br>
optimistic but it worked - very well.<br>
<br>
Kevin<br>
<br>
On Wed, Jun 22, 2022, 11:53 AM Graham Knight <<a href="mailto:biodesigndiy@gmail.com" target="_blank" rel="noreferrer">biodesigndiy@gmail.com</a>> wrote:<br>
<br>
> Dear Stovers,<br>
><br>
> I am much puzzled by the correspondence concerning digging a hole, etc.<br>
> under a 3-stone stove!!<br>
> If you put fuel into a hole it will certainly burn more slowly with the<br>
> restricted combustion air.<br>
> It will therefore give less heat per minute to the cooking pot.<br>
> How long for the pot to come to the boil, if ever?<br>
><br>
> Graham Knight<br>
> <a href="http://biodesign20.co.uk" rel="noreferrer noreferrer" target="_blank">biodesign20.co.uk</a><br>
><br>
><br>
> --<br>
> This email has been checked for viruses by AVG.<br>
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><br>
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Message: 3<br>
Date: Wed, 22 Jun 2022 12:17:02 +0200<br>
From: K McLean <<a href="mailto:kmclean56@gmail.com" target="_blank" rel="noreferrer">kmclean56@gmail.com</a>><br>
To: Discussion of biomass cooking stoves<br>
<<a href="mailto:stoves@lists.bioenergylists.org" target="_blank" rel="noreferrer">stoves@lists.bioenergylists.org</a>><br>
Subject: Re: [Stoves] Improved 3-stone stoves<br>
Message-ID:<br>
<CALxcr-vSF7Fj9GArmorJ9n3WKffuSz=<a href="mailto:d2NeLa0-EGn-%2BVrh4iQ@mail.gmail.com" target="_blank" rel="noreferrer">d2NeLa0-EGn-+Vrh4iQ@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
I can tell you that some air circulation in the fuel seems necessary. Fine<br>
sawdust will not burn.<br>
<br>
On Wed, Jun 22, 2022, 12:13 PM K McLean <<a href="mailto:kmclean56@gmail.com" target="_blank" rel="noreferrer">kmclean56@gmail.com</a>> wrote:<br>
<br>
> Dear Graham,<br>
><br>
> The best I can do is tell you the cooking hole works. Smarter people can<br>
> tell you why<br>
><br>
> The cooking hole was something of an accidental discovery. We were<br>
> working with the top down burn of crop waste, which works wonderfully.<br>
><br>
> I wanted to try the top down burn in a three stone cookstove but there is<br>
> little room under the cookpot. So we dug a hole for the fuel. I was not<br>
> optimistic but it worked - very well.<br>
><br>
> Kevin<br>
><br>
> On Wed, Jun 22, 2022, 11:53 AM Graham Knight <<a href="mailto:biodesigndiy@gmail.com" target="_blank" rel="noreferrer">biodesigndiy@gmail.com</a>><br>
> wrote:<br>
><br>
>> Dear Stovers,<br>
>><br>
>> I am much puzzled by the correspondence concerning digging a hole, etc.<br>
>> under a 3-stone stove!!<br>
>> If you put fuel into a hole it will certainly burn more slowly with the<br>
>> restricted combustion air.<br>
>> It will therefore give less heat per minute to the cooking pot.<br>
>> How long for the pot to come to the boil, if ever?<br>
>><br>
>> Graham Knight<br>
>> <a href="http://biodesign20.co.uk" rel="noreferrer noreferrer" target="_blank">biodesign20.co.uk</a><br>
>><br>
>><br>
>> --<br>
>> This email has been checked for viruses by AVG.<br>
>> <a href="https://www.avg.com" rel="noreferrer noreferrer" target="_blank">https://www.avg.com</a><br>
>><br>
>><br>
>> _______________________________________________<br>
>> Stoves mailing list<br>
>><br>
>> to Send a Message to the list, use the email address<br>
>> <a href="mailto:stoves@lists.bioenergylists.org" target="_blank" rel="noreferrer">stoves@lists.bioenergylists.org</a><br>
>><br>
>> to UNSUBSCRIBE or Change your List Settings use the web page<br>
>><br>
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>><br>
>> for more Biomass Cooking Stoves, News and Information see our web site:<br>
>> <a href="http://stoves.bioenergylists.org/" rel="noreferrer noreferrer" target="_blank">http://stoves.bioenergylists.org/</a><br>
>><br>
>><br>
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<br>
Message: 4<br>
Date: Wed, 22 Jun 2022 15:35:18 +0000<br>
From: Crispin Pemberton-Pigott <<a href="mailto:crispinpigott@outlook.com" target="_blank" rel="noreferrer">crispinpigott@outlook.com</a>><br>
To: Discussion of biomass cooking stoves<br>
<<a href="mailto:stoves@lists.bioenergylists.org" target="_blank" rel="noreferrer">stoves@lists.bioenergylists.org</a>><br>
Subject: Re: [Stoves] ***SPAM*** Cooking Hole Modification to Three<br>
Stone Cookstove - Update<br>
Message-ID:<br>
<<a href="mailto:BL0PR18MB212912395960935DBA2F9DF1B1B29@BL0PR18MB2129.namprd18.prod.outlook.com" target="_blank" rel="noreferrer">BL0PR18MB212912395960935DBA2F9DF1B1B29@BL0PR18MB2129.namprd18.prod.outlook.com</a>><br>
<br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
Dear Kevin<br>
<br>
This is another fine piece of work. I looked at all the videos and the techniques are clearly explained.<br>
<br>
I suggest that it is possible to make a round hole and to bundle the fuel with string or grass such that it is prepared in advance and fills the hole completely. This method of cooking with grass and reeds was in use in Ugandan restaurants in 1986 or perhaps 1985. Fuel vendors prepared the fuel for sale in "cylinders" which were dropped into the stove and top-lit. The difference is that the fuel was standing up, not cross-layered and horizontal. I understand they tied the reeds into long bundles with multiple strings and then sliced then like a sausage so one string held one bundle.<br>
<br>
You might try it to see if it is more convenient than hand-laying the pieces.<br>
<br>
I am sure a mix of fuels would be better than one alone. Twigs and stover, for example.<br>
<br>
Realizing that this is potentially wasteful, but have you tried burying a bucket in the ground and using that? You can douse it and lift it out by the handle. In some places buckets are hand made from roofing as a cylinder, not tapered. That might be ideal.<br>
<br>
Many thanks for your original ideas and extensive field work.<br>
<br>
Best regards<br>
Crispin<br>
<br>
<br>
<br>
From: Stoves <<a href="mailto:stoves-bounces@lists.bioenergylists.org" target="_blank" rel="noreferrer">stoves-bounces@lists.bioenergylists.org</a>> On Behalf Of K McLean<br>
Sent: Tuesday, June 21, 2022 15:13<br>
To: Stoves and Biofuels Network <<a href="mailto:stoves@lists.bioenergylists.org" target="_blank" rel="noreferrer">stoves@lists.bioenergylists.org</a>>; Ronal Larson <<a href="mailto:rongretlarson@comcast.net" target="_blank" rel="noreferrer">rongretlarson@comcast.net</a>><br>
Subject: [Stoves] ***SPAM*** Cooking Hole Modification to Three Stone Cookstove - Update<br>
<br>
Adding a 25x25x25 cm hole to traditional open-fire cookstoves may end the collection of firewood from forests in many areas. By piling fuel in the hole beneath the cookpot and lighting the pile on the top, the fuel burns long, hot, with no tending and with less smoke. And by quenching the embers, cooks make biochar.<br>
<br>
We found that most woody biomass bigger than thin twigs burns well in the cooking hole<<a href="https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fyoutu.be%2FDmzQFCp2kNI&data=05%7C01%7C%7C68bcf13a7d194e0b350d08da53cb771b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637914430623277935%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=GGtQyXFPvzO7mFbB9bMNjvUsv64MuWe6UtJmqJLiwi8%3D&reserved=0" rel="noreferrer noreferrer" target="_blank">https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fyoutu.be%2FDmzQFCp2kNI&data=05%7C01%7C%7C68bcf13a7d194e0b350d08da53cb771b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637914430623277935%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=GGtQyXFPvzO7mFbB9bMNjvUsv64MuWe6UtJmqJLiwi8%3D&reserved=0</a>>. Firewood the size that is typically burned in unmodified three stone cookstoves burns for three hours without tending. Much less smoke is emitted than from an unmodified three stone cookstove. A colleague estimates that the amount of wood in the cooking hole would burn for 30-40 minutes in an unmodified three stone cookstove. Here's a video<<a href="https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F15V4vTJxO1Lcm0wFzB96pQT9jvgjaXkwh%2Fview%3Fusp%3Dsharing&data=05%7C01%7C%7C68bcf13a7d194e0b350d08da53cb771b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637914430623277935%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=1uOjT3ew6FHZMuIG7jeq3zZcQuDHKnON7E4HG987JVc%3D&reserved=0" rel="noreferrer noreferrer" target="_blank">https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F15V4vTJxO1Lcm0wFzB96pQT9jvgjaXkwh%2Fview%3Fusp%3Dsharing&data=05%7C01%7C%7C68bcf13a7d194e0b350d08da53cb771b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637914430623277935%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=1uOjT3ew6FHZMuIG7jeq3zZcQuDHKnON7E4HG987JVc%3D&reserved=0</a>>.<br>
<br>
Thick twigs burned without tending for 1.5 hours. Thick twigs and small branches are abundant and unused in much of Africa.<br>
<br>
The cooking hole also works with crop waste (maize stalks and cobs, cassava stems, banana peels, bean stems, ...), elephant grass, bamboo, large sawdust and wood shavings, sawdust briquettes, dung patties and more. Depending on the fuel, the fire will burn without tending for 20 minutes to several hours. Here's our training video<<a href="https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fyoutu.be%2FDmzQFCp2kNI&data=05%7C01%7C%7C68bcf13a7d194e0b350d08da53cb771b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637914430623277935%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=GGtQyXFPvzO7mFbB9bMNjvUsv64MuWe6UtJmqJLiwi8%3D&reserved=0" rel="noreferrer noreferrer" target="_blank">https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fyoutu.be%2FDmzQFCp2kNI&data=05%7C01%7C%7C68bcf13a7d194e0b350d08da53cb771b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637914430623277935%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=GGtQyXFPvzO7mFbB9bMNjvUsv64MuWe6UtJmqJLiwi8%3D&reserved=0</a>>.<br>
<br>
Women can:<br>
- All but stop collecting firewood.<br>
- Leave the kitchen to do other things once they start the fire.<br>
- Make biochar.<br>
<br>
And 8-12 common bricks can support two cookpots over one cooking hole allowing two meals to be cooked with the same amount of fuel and time it takes to cook one meal. The time to boil is only a few minutes longer than for one pot.<br>
[cid:image001.jpg@01D88586.BA2EC9D0]<br>
<br>
<br>
In much of Africa, most people know how to make bricks. We show them how to make free custom bricks to line the cooking hole. Here is a video<<a href="https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1b2WvePKX_ofnELUWhexqQZR4NyCrXxnH%2Fview%3Fusp%3Dsharing&data=05%7C01%7C%7C68bcf13a7d194e0b350d08da53cb771b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637914430623277935%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=IeKQEii4NbgtfQZmX8o5k9t%2FRaNn2cMhJydcOgUdwbQ%3D&reserved=0" rel="noreferrer noreferrer" target="_blank">https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1b2WvePKX_ofnELUWhexqQZR4NyCrXxnH%2Fview%3Fusp%3Dsharing&data=05%7C01%7C%7C68bcf13a7d194e0b350d08da53cb771b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637914430623277935%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=IeKQEii4NbgtfQZmX8o5k9t%2FRaNn2cMhJydcOgUdwbQ%3D&reserved=0</a>>.<br>
<br>
Kevin McLean<br>
Sun24<br>
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Message: 5<br>
Date: Wed, 22 Jun 2022 15:48:16 +0000 (UTC)<br>
From: "<a href="mailto:briancady413@yahoo.com" target="_blank" rel="noreferrer">briancady413@yahoo.com</a>" <<a href="mailto:briancady413@yahoo.com" target="_blank" rel="noreferrer">briancady413@yahoo.com</a>><br>
To: Discussion of biomass cooking stoves<br>
<<a href="mailto:stoves@lists.bioenergylists.org" target="_blank" rel="noreferrer">stoves@lists.bioenergylists.org</a>><br>
Subject: Re: [Stoves] ***SPAM*** Cooking Hole Modification to Three<br>
Stone Cookstove - Update<br>
Message-ID: <<a href="mailto:1727848971.7377854.1655912896599@mail.yahoo.com" target="_blank" rel="noreferrer">1727848971.7377854.1655912896599@mail.yahoo.com</a>><br>
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This discussion seems valuable.An addition, For What It's Worth:Cook and make biochar with merely a shovel? - Dakota fire hole modified to make biochar cleanly - progress so far.<br>
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Cook and make biochar with merely a shovel? - Dakota fire hole modified ...<br>
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Dakota fire holes are easy to build/dig, burn cleanly and clean up well. For more on these one can see: https://...<br>
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Brian-<br>
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On Wednesday, June 22, 2022 at 11:39:53 AM EDT, Crispin Pemberton-Pigott <<a href="mailto:crispinpigott@outlook.com" target="_blank" rel="noreferrer">crispinpigott@outlook.com</a>> wrote: <br>
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Dear Kevin<br>
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This is another fine piece of work. I looked at all the videos and the techniques are clearly explained.<br>
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I suggest that it is possible to make a round hole and to bundle the fuel with string or grass such that it is prepared in advance and fills the hole completely.? This method of cooking with grass and reeds was in use in Ugandan restaurants in 1986 or perhaps 1985.? Fuel vendors prepared the fuel for sale in ?cylinders? which were dropped into the stove and top-lit.? The difference is that the fuel was standing up, not cross-layered and horizontal.? I understand they tied the reeds into long bundles with multiple strings and then sliced then like a sausage so one string held one bundle.<br>
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You might try it to see if it is more convenient than hand-laying the pieces.<br>
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I am sure a mix of fuels would be better than one alone.? Twigs and stover, for example.<br>
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Realizing that this is potentially wasteful, but have you tried burying a bucket in the ground and using that? You can douse it and lift it out by the handle. ?In some places buckets are hand made from roofing as a cylinder, not tapered. ?That might be ideal.<br>
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Many thanks for your original ideas and extensive field work.<br>
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Best regards<br>
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Crispin<br>
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From: Stoves <<a href="mailto:stoves-bounces@lists.bioenergylists.org" target="_blank" rel="noreferrer">stoves-bounces@lists.bioenergylists.org</a>>On Behalf Of K McLean<br>
Sent: Tuesday, June 21, 2022 15:13<br>
To: Stoves and Biofuels Network <<a href="mailto:stoves@lists.bioenergylists.org" target="_blank" rel="noreferrer">stoves@lists.bioenergylists.org</a>>; Ronal Larson <<a href="mailto:rongretlarson@comcast.net" target="_blank" rel="noreferrer">rongretlarson@comcast.net</a>><br>
Subject: [Stoves] ***SPAM*** Cooking Hole Modification to Three Stone Cookstove - Update<br>
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Adding a 25x25x25 cm hole to traditional open-fire cookstoves may end the collection of firewood from forests?in many areas.? By piling fuel in the hole beneath the cookpot and lighting the pile on the top, the fuel burns long, hot, with no tending and with less smoke.? And by quenching the embers, cooks make biochar.<br>
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We found that most woody biomass bigger?than thin twigs burns well in the?cooking hole.? Firewood the size that is typically burned in unmodified three stone cookstoves burns for three hours without tending.? Much less smoke is emitted?than from an unmodified three stone cookstove.? A colleague estimates that the amount of wood in the cooking hole would burn for 30-40 minutes in an unmodified three stone cookstove.? Here's avideo.?<br>
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Thick twigs burned without tending for 1.5 hours.? Thick twigs and small branches are abundant and unused in much of Africa.<br>
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The cooking hole also works with crop waste (maize stalks and cobs, cassava stems, banana peels, bean stems, ...), elephant grass, bamboo, large sawdust and wood shavings, sawdust briquettes, dung patties and more.? Depending on the fuel, the fire will burn without tending for 20 minutes to several hours.? Here's ourtraining video.<br>
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Women can:<br>
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- All but stop collecting firewood.<br>
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- Leave the kitchen to do other things once they start the fire.<br>
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- Make biochar.<br>
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And 8-12 common bricks can support two cookpots over one cooking hole allowing two meals to be cooked with the same amount of fuel and time it takes to cook?one meal.? The time to boil is only a few minutes longer than for one pot.<br>
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In much of Africa, most people know how to make bricks.? We show them how to make free custom bricks to line the cooking hole.? Here is a?video.<br>
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Kevin McLean<br>
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Sun24<br>
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