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<DIV><FONT face=Arial size=2>Dear Crispin </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks for noting this. It was also clearly
illustrated on the stoves list several years back</FONT></DIV>
<DIV><FONT face=Arial size=2>in the article on introducing the
Approvecho/Stovetec unit in the Marshall Islands. While the amount of char
produced is small it </FONT></DIV>
<DIV><FONT face=Arial size=2>definitely does product char.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Michael N Trevor</FONT></DIV>
<DIV><FONT face=Arial size=2>Majuro </FONT></DIV>
<DIV><FONT face=Arial size=2>Marshall Islands</FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=crispinpigott@gmail.com href="mailto:crispinpigott@gmail.com">Crispin
Pemberton-Pigott</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">'Discussion of biomass cooking
stoves'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, September 17, 2012 3:36
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Stoves] FW: Need
designs</DIV>
<DIV><BR></DIV>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Dear
Ron and Aron<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">A
Rocket stove typically makes quite a bit of charcoal and that is one reason
why you should put a grate in, if you plan to save fuel. The ends of the
sticks fall off long before the charcoal is burned and sit in a pile on the
floor of the combustion chamber. Whatever happens not to burn, is lost
later.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">If
you want to make additional charcoal put in a grate with a small number of 8mm
holes in it, of 6mm. This will cut off most primary air and cause the creation
of a much larger (about double) the amount. The Namibian Tsotso is a stove
which is built exactly like that. It creates charcoal so effectively that
towards the end of a WBT it hard to get additional fuel in because of the pile
of char. It could in theory burn at least some of it but it is not really set
up to do so. If you do add such a grate, it is, by definition, a not Rocket
Stove (which always has overhanging fuel and air supplied from
underneath).<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">The
Institutional Lion Stove, which is basically a Rocket Stove with preheated
primary air, also makes a lot of char, until it fills the lower combustion
chamber. This then acts as a simmering fuel charge and all the firewood can be
removed. I have seen a stove with a 70 litre pot simmering for ages (more than
an hour) using on this cube of char what was blocking the primary air entrance
up level to the fuel shelf (which is made of brick).<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">In
fact I found a photo of that very stove which is at an orphan feeding station
in Moneni, Swaziland. There is no firewood in the chamber at all. The stove
saves about 70% of the fuel in part because of this. If you are
wondering what the metal rings are on the top, the pots are chained to the
stove to prevent them growing legs. They already have three feet so they tend
to go walk-about.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Xavier
on this list has been making similar stoves in Benin. A complete description
of how to make it is in the NDE library at <A
href="http://www.newdawnengineering.com/website/library/Stoves/lionstove/">http://www.newdawnengineering.com/website/library/Stoves/lionstove/</A>
<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Regards<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Crispin<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><IMG id=Picture_x0020_1 height=296
src="cid:000f01cd94a3$4fc73d90$b0ebfea9@HP29397140882" width=473
border=0><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p></o:p></SPAN></P>
<P class=MsoNormal><o:p> </o:p></P>
<DIV>
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><SPAN
style="COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">Aron:<BR><BR>
Can you clarify your intended design? I know of no way that you can turn
a rocket stove into a char-making stove (but would love to hear
differently).<BR><BR>Ron.<o:p></o:p></SPAN></P></DIV></DIV>
<P>
<HR>
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