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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dear Nat<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div id="AOLMsgPart_0_7bfb4cd7-8cff-4407-b1f4-4afcc533fb31"><pre style='background:white'><tt><span style='color:black'><o:p> </o:p></span></tt></pre><div><pre style='background:white'><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:#1F497D'>></span><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:black'>every time</span><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:#1F497D'> </span><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:black'>I think you could not have a more diverse CV you surprise me with something<o:p></o:p></span></pre><pre style='background:white'><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:#1F497D'>></span><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:black'>new. </span><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:#1F497D'><o:p></o:p></span></pre><pre style='background:white'><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></pre><pre style='background:white'><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I have a strange CV, I admit. I hide most of it. Especially that bit about being a security guard at an apartment building and putting wood trim into fibreglass yachts in Whitby – the <i>most</i> uncomfortable task I ever performed.<o:p></o:p></span></pre><pre style='background:white'><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></pre><pre style='background:white'><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:#1F497D'>></span><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:black'>You are right about AL having almost as many<o:p></o:p></span></pre><pre style='background:white'><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:#1F497D'>></span><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:black'>diverse abilities as you do. With good<o:p></o:p></span></pre><pre style='background:white'><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:#1F497D'>></span><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:black'>engineering these means better cheaper stoves for all. </span><span style='font-family:"Tahoma","sans-serif";color:black'><o:p></o:p></span></pre></div><pre style='background:white'><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></pre><pre style='background:white'><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I think we should explore the possibilities of using it more. I have advocated learning from Dale Andreatta’s finned pot experiments and try this: according to the back of my envelope, there is more fuel savings in melting and recasting Darfur pots with fins than there is in any of the improved stoves. The wood needed to do it would soon be saved by the improved pot.<o:p></o:p></span></pre><div><pre style='background:white'><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><br>I am about to embark on a design exercise for heating water and will be using AL castings to see if we can get a local, rapid-to-produce heat exchanger based on a very interesting idea incorporated in a strange bench heating burner/stove being promoted in Oregon/Washington for heating cob houses. It is advocated by one of the original Lorena stove developers which I guess puts a minimum age on him close to mine.<o:p></o:p></span></pre><pre style='background:white'><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></pre></div><pre style='background:white'><tt><span style='color:black'><o:p> </o:p></span></tt></pre><div><pre style='background:white'><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:#1F497D'>></span><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:black'>As for AL availability in Africa<o:p></o:p></span></pre><pre style='background:white'><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:#1F497D'>></span><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:black'>we need only look to the standard mitard aluminium pot which exists in every<o:p></o:p></span></pre><pre style='background:white'><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:#1F497D'>></span><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:black'>country we work in. many are made from can and old engine blocks, have some<o:p></o:p></span></pre><pre style='background:white'><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:#1F497D'>></span><span lang=EN-GB style='font-family:"Tahoma","sans-serif";color:black'>great footage of them being made in Senegal.</span><span style='font-family:"Tahoma","sans-serif";color:black'><o:p></o:p></span></pre></div><pre style='background:white'><tt><span style='color:#1F497D'><o:p> </o:p></span></tt></pre><pre style='background:white'><tt><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>It is one of the great, lasting contributions NGO’s make to the local economy: hundreds of kilos of rolled over, broken and smashed SUV’s made with high strength aluminum alloys. Think of all the Peugeots with their AL differential cases and those wonderful Land Cruiser 6 cylinder heads. You can get several pots from each one.<o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='font-family:"Tahoma","sans-serif";color:#1F497D'><o:p> </o:p></span></tt></pre><pre style='background:white'><tt><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The guys in Senegal are good but I have to hand it to the Nigeriens (from Niger) for sheer skill at making a form in sand from a broken motorcycle case and then melting it and recasting a new one from the same material. They use hand cranked fans which run at about 3000 RPM. All locally made in the sand by copying another one. The is an ox-powered pump called a FED-Ardetec Pump made in Ndounga, Niger which has many parts cast locally over a tiny charcoal fire. Just amazing.<o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></tt></pre><pre style='background:white'><tt><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You know the top of the Stovetec 2-door unit? It has a very thin cast iron plate which is quite cheap but you have to get them from China, about $1. Perhaps they could be made in AL from local drink cans. I don’t think anyone could melt one in normal use.<o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></tt></pre><pre style='background:white'><tt><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Sumpin’ to think about.<o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards<o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Crispin looking for penguins<o:p></o:p></span></tt></pre></div></div></div></body></html>