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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='color:#1F497D'>Dear Tom<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>What a great backgrounder. I hope Jetmaster brings us new versions for the oddball fuels entering the market. That process of limiting air to high velocity jets is exactly what I found worked well in retaining a gas production zone at the bottom of the Vesto. That is why there are three 8mm holes near the bottom, instead of plain walls. I found that it is far less susceptible to flame-out in the gas burning zone immediately above the gas-producing zone.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Personally I find it much better than the ‘pure’ pyrolysis approach where there is an advancing flame front for the reason that it works with wood instead of processed wood and chips and pellets. Even then, with homogenised fuels, it is better to have a couple of jets blowing onto the surface to keep a flame going immediately above: more reliable over wider fuel types.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The idea of the air jets is that they can reach to the far side of the combustion chamber (observe and modify diameter to suit) and there should be enough of them so that some can be blocked by fuel and it will still work.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>What I saw in the patent drawings looks like a semi-gasifier, in the same combustion class as the Vesto and for similar reasons. Both are refuellable.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Regards<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Crispin<o:p></o:p></span></p></div></body></html>