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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<DIV>Thanks Crispin,</DIV>
<DIV>but then issue then is getting what ever here. A stove can cost 25.00 and
then it costs 200.00 dollars to ship it here. </DIV>
<DIV> </DIV>
<DIV>Michael</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=crispinpigott@outlook.com
href="mailto:crispinpigott@outlook.com">Crispin Pemberton-Pigott</A> </DIV>
<DIV><B>Sent:</B> Tuesday, October 07, 2014 2:00 AM</DIV>
<DIV><B>To:</B> <A title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">'Discussion of biomass cooking
stoves'</A> </DIV>
<DIV><B>Subject:</B> Re: [Stoves] Help with rocket stove for
Cameroon</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<P class=MsoPlainText>Dear Michael<o:p></o:p></P>
<P class=MsoPlainText><o:p></o:p> </P>
<P class=MsoPlainText>There are a couple of other alternatives in use. One is
the grate developed by the Rocketworx people in Durban. This seems to be very
effective at getting the char burned to ash with very little remnant (means high
energy from available fuel). The other is the Improved Keren Stove which
was developed at YDD in Indonesia in 2012 that has a tilted grate, very low to
the floor. It is about 20mm high on the near (fuel feed) side and 40mm at the
back. This also has an air entrance at the back about 20 x 40mm (rectangle). The
grate bar spacing is important, as is the shape.<o:p></o:p></P>
<P class=MsoPlainText><o:p></o:p> </P>
<P class=MsoPlainText>This also burns virtually 100% of the fuel put in. The
additional modification to the Keren stove is to lower the pot significantly on
the stove body to serve as an excess air controller. The traditional pot rest
height was FAR too high - about 25mm. At 7mm it controls the excess air to
a reasonable level.<o:p></o:p></P>
<P class=MsoPlainText><o:p></o:p> </P>
<P class=MsoPlainText>The combination plus one other modification increases the
thermal efficiency from —16% to —33%.<o:p></o:p></P>
<P class=MsoPlainText><o:p></o:p> </P>
<P class=MsoPlainText>Regards<o:p></o:p></P>
<P class=MsoPlainText>Crispin<o:p></o:p></P>
<P class=MsoPlainText>________</P>
<P class=MsoPlainText><SPAN style="COLOR: black"><o:p></o:p></SPAN> </P>
<P class=MsoPlainText><o:p></o:p> </P>
<P class=MsoPlainText>Very important issue ---- <o:p></o:p></P>
<P class=MsoPlainText><o:p></o:p> </P>
<P class=MsoPlainText>"The proposed modifications included the possibility of
using an air inlet that is separated from the firewood magazine (bypass air
inlet). With this modification, the firewood magazine is built in such a way
that it suspends the burning tips of the firewood above the bypass air inlet, to
simulate the function of the firewood shelf."<o:p></o:p></P>
<P class=MsoPlainText><o:p></o:p> </P>
<P class=MsoPlainText>I have seen sheet metal, wire, rod shelves burn rust and
disintegrate leaving the rocket a stove owner with little choice but to use
without.<o:p></o:p></P>
<P class=MsoPlainText><o:p></o:p> </P>
<P class=MsoPlainText>Michael N Trevor<o:p></o:p></P>
<P class=MsoPlainText>Majuro<o:p></o:p></P>
<P class=MsoPlainText>Marshall Islands <o:p></o:p></P>
<P class=MsoPlainText><o:p></o:p> </P></DIV>
<P>
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