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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link="#0563C1" vlink="#954F72"><div class=WordSection1><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).š 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.š 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></body></html>