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<DIV><FONT face=Arial>This sound really interesting and worth follow
up</FONT></DIV>
<DIV><FONT face=Arial>Adapting or modifying a used behavior is certainly likely
to meet with more success.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Michael</FONT></DIV>
<DIV><FONT face=Arial>Majuro</FONT></DIV>
<DIV><FONT face=Arial>Marshall Islands</FONT></DIV>
<DIV style="FONT: 10pt Tahoma">
<DIV><FONT size=3 face=Arial></FONT><FONT size=3 face=Arial></FONT><BR></DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A
title="mailto:crispinpigott@gmail.com
CTRL + Click to follow link"
href="mailto:crispinpigott@gmail.com">Crispin P-P</A> </DIV>
<DIV><B>Sent:</B> Monday, July 09, 2012 4:47 AM</DIV>
<DIV><B>To:</B> <A
title="mailto:stoves@lists.bioenergylists.org
CTRL + Click to follow link"
href="mailto:stoves@lists.bioenergylists.org">Discussion of biomass cooking
stoves</A> </DIV>
<DIV><B>Subject:</B> Re: [Stoves] Improving three stone stoves and finding out
where wild jatropha grows</DIV></DIV></DIV>
<DIV><BR></DIV>Dear Joyce <BR><BR>
<DIV id=1331810136102-sig-id>There in Ethiopia three stone fires that are made
using three hand made 'stones' formed from clay. </DIV>
<DIV id=1331810136102-sig-id><BR></DIV>
<DIV id=1331810136102-sig-id>These fires significantly outperform regular fires
because the whole fire is more controllable. Basically the stones are C-shaped
clay stands with a flat top and bring bottom so they can stand by themselves.
</DIV>
<DIV id=1331810136102-sig-id><BR></DIV>
<DIV id=1331810136102-sig-id>As they stand on their own the can be moved in and
out racially to support lots of different sizes and his staff different sized
fires. When close together the form a small combustion chamber that is mostly
vertical wall and just enough space to fit in some wood. </DIV>
<DIV id=1331810136102-sig-id><BR></DIV>
<DIV id=1331810136102-sig-id>Referring to your suggestion about the clay wall
between the stones, what they can have a more than three clay supports. This
means the stove is not optimized for one pot size, but can be set to suit any
pot with ease. </DIV>
<DIV id=1331810136102-sig-id><BR></DIV>
<DIV id=1331810136102-sig-id>To burn jatropha seeds you will need a combustion
chamber with highly restricted primary air. This need results from the oily
nature of the fuel and it's tendency to make runaway fires. Flames will
probably not give toxic fumes but the smoke is probably pretty awful if the
flames go out. </DIV>
<DIV id=1331810136102-sig-id><BR></DIV>
<DIV id=1331810136102-sig-id>If you try the jatropha branches I would be
interested to know what you think of such a movable clay stone fire. </DIV>
<DIV id=1331810136102-sig-id><BR></DIV>
<DIV id=1331810136102-sig-id>Regards </DIV>
<DIV id=1331810136102-sig-id>Crispin </DIV>
<HR>
<DIV><STRONG>From:</STRONG> "Joshua Guinto" <<A
href="mailto:jed.building.bridges@gmail.com">jed.building.bridges@gmail.com</A>><BR><STRONG>To:</STRONG>
"Discussion of biomass cooking stoves" <<A
href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</A>><BR><STRONG>Sent:</STRONG>
July 8, 2012 11:38 PM<BR><STRONG>Subject:</STRONG> Re: [Stoves] Improving three
stone stoves and finding out where wild jatropha grows<BR></DIV><BR>Dear
Joyce<BR><BR>Have you seen the website of Jon and Flip on the Recho Rocket
stoves. i thought it will be very simple to make and that even women could make
them. <A
href="http://www.rechoroket.com/%22How_to%22_Albums/%22How_to%22_Albums.html">http://www.rechoroket.com/%22How_to%22_Albums/%22How_to%22_Albums.html</A><BR><BR>Clay
is a very versatile material to work with. It is very cheap and can be built on
site even without electricity or welding machine and by women. <BR><BR>I am now
trying to make grills as fuel grates using clay. It would be a simple flat disc
and then you punch holes through the wet clay while it is still soft. I think
2.5 cm thick is best. I mix clay with temper which could be carbonized rice hull
or fine saw dust in a ratio of 2 parts clay to 1 part of temper. The website of
Jon and Flip will tell you more about better recipes. But if your intention is
to use it as a fuel grate, i would advice you to make a higher ratio of clay
because you need durability than insulability for this function.
<BR><BR> As soon as the disc is dried, you can use it to elevate the fuel
to allow air to come beneath. The disc will :"self fire" meaning it will harden
in fire as you use it intensely. I observe that intense use can "cook" the clay
to as much as 1.5 cm deep. <BR><BR>Still with clay, you can use it to make a
skirt around the three stone stove. In fact you can use the same clay to make a
three piece platform and make a sturdy and stable platform instead of the three
stones which are irregular in shape. The same clay will self fire through time.
<BR><BR>But my wise guess is that this will be very smoky. You will need to
create a higher coloumn of the fire box to create enough draft to pull in enough
air so there will be enough to burn the gases, tars and oils. There is a certain
ratio of fuel to air to attain the right combustion, 1 part fuel to five parts
air (if im not mistaken). <BR><BR>Just like nut shells, firing it from the top
as in TLUD will give you better results. Dr. Paul Anderson has a lot of
experience and materials on this. However, with the TLUD mechanism, you will
have to raise the coloumn of the stove to create stronger draft and to create
higher temperature so the oils, tars, particulate matters and other gases may be
burned. Otherwise, with the basic three stone stove, it will produce a lot of
smoke.<BR><BR>If you can be successful with this, why not try the next level -
the recho rocket or maybe the holey roket by Rok Oblak? <A
href="http://www.holeyroket.wordpress.com">www.holeyroket.wordpress.com</A>. I
undertook skills training with fisherfolks in a village of Sorsogon here in the
Philippines. The participants were composed of men and women. I observe that the
men are good in mashing the clay and cutting things but the women are better in
design and the detailed plastering and finishing the stove body. The combination
of men and women is best. <BR><BR>Finally, with such stoves, you there is less
worry about the fuel because the options will be expanded. Such stoves can be
used with a lot of fuel combinations - wood sticks, palm fronds,
grasses if you twist them tight and of course holey briquettes. Jathropa
is among the good options. I understand jatropha seeds would be a great
fuel to bring along in camping and picnics because they contain a lot of energy.
It would also be good to keep them in storage in anticipation of natural
disasters. <BR><BR>We have here jathropa in my neighborhood, here in the
Philippines. People commonly use it as fencing material and the leaves to cure
simple ailments. However, i am still comfortable with the pili shell
and green coconut shells around here that are more accessible. <BR><BR>All the
best Joyce and good luck. <BR><BR>Jed <BR><BR><BR><BR><BR><BR><BR>
<DIV class=gmail_quote>2012/7/8 Joyce Lockard <SPAN dir=ltr><<A
href="mailto:rj.lockard@frontier.com"
target=_blank>rj.lockard@frontier.com</A>></SPAN><BR>
<BLOCKQUOTE
style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>
<DIV lang=EN-US link="blue" vlink="purple">
<DIV>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">I wonder if it would help to
fill in two of the spaces between three of the stones with curving walls of
clay, leaving one open for the fuel. Clay would reduce heat loss due to
any horizontal air currents so help keep it hotter under the pot. The clay
walls could come up to within an inch or so of the bottom of the pot, which
would still be supported by sitting on the three stones, so that emissions and
hot air would be deflected up the pot sides. And, very important, it is
something that a woman could do herself without any expense.
<U></U><U></U></SPAN></P>
<P class=MsoNormal><SPAN
style="COLOR: #1f497d"><U></U><U></U></SPAN> </P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">I am trying to find out where
(in what countries) jatropha is growing wild, so women could scavenge for the
seeds. Another question is whether there is a way to make a simple grate
for three stone stoves to hold up the jatropha seeds. I suppose they
would burn if they were on the ground under wood. </SPAN><SPAN
style="COLOR: #1f497d">W</SPAN><SPAN style="COLOR: #1f497d">ould</SPAN><SPAN
style="COLOR: #1f497d"> there</SPAN><SPAN style="COLOR: #1f497d"> be an
advantage in lifting them above the wood, up close to the pot
bottom?<U></U><U></U></SPAN></P>
<P class=MsoNormal><SPAN
style="COLOR: #1f497d"><U></U><U></U></SPAN> </P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">I have read that half of the
people who burn wood/charcoal for cooking are using three stone stoves.
</SPAN><SPAN style="COLOR: #1f497d">Trying to help the poorest of women with
simple, cheap or no-cost improvements in their three stone stoves is in line
with the first Millennium Development Goal of relieving extreme poverty.
I </SPAN><SPAN style="COLOR: #1f497d">would like to </SPAN><SPAN
style="COLOR: #1f497d">find colleagues to try this idea</SPAN><SPAN
style="COLOR: #1f497d"> of adding clay walls. It </SPAN><SPAN
style="COLOR: #1f497d">is not something I can do at my home. Any suggestions
of where I can find people to try it? If it appears feasible to add the
mud walls, then the challenge will be to make the idea known to those who need
it. </SPAN><SPAN style="COLOR: #1f497d"> </SPAN><SPAN
style="COLOR: #1f497d"><U></U><U></U></SPAN></P>
<P class=MsoNormal><U></U><U></U> </P>
<P class=MsoNormal><U></U><U></U> </P>
<P class=MsoNormal><B><I><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 8pt">Joyce M
Lockard<U></U><U></U></SPAN></I></B></P>
<P
class=MsoNormal><U></U><U></U> </P></DIV></DIV><BR>_______________________________________________<BR>Stoves
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