On 6 October 2011 01:46, Andrew C. Parker <[email protected]> wrote:
> Insulating the combustion area and flue should improve combustion. If you > have some leftover fiberglass or rockwool batting, you could wrap some > around and run an experiment (don't use the kind encapsulated in plastic). > > You may want to experiment with nesting tubes to preheat primary and/or > secondary air, rather than (or, in addition to) adding insulation. > > I wondered about a MKII with propane tank for the base, partially filled with a refractory, and adding the flue to the top. Not sure how to preheat primary air, short of adding a fan. > I need to resize my stove to fit the opening into the barbecue. The flow > is being choked now, and I get more smoke than I should. It is still a vast > improvement over an open fire. > > I used a plasma cutter and made a compass to guide the cutter around a convenient hole in the base of the kettle. > Do you get any backdraft through your feed tube? Is there a separate > primary air source? No, the angle was about 40 deg to the horizontal, and there's no sign of back draught. I left the bottom of the flue open, so its drawing primary from there, in preference, I think. Steve
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