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Post by edke6bnl on Apr 28, 2013 12:49:45 GMT -8
I built this rocket stove out of a propane tank and 3.5 in square tube. it has a lazy fire not a roar. I have questions about the ratio of the air inlet opening size to the burner size. and how far the divider should go. filled with vermiculite, and how high above burner plate for the grille??  |
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Post by satamax on Apr 28, 2013 14:07:35 GMT -8
too small a tube, laminar flow impedes with the draft. Build it bigger.
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Post by edke6bnl on Apr 29, 2013 5:40:06 GMT -8
what about the air opening size compared to the fuel opening???
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Post by Donkey on Apr 29, 2013 7:52:25 GMT -8
In the Aprovecho style pattern you are using, the "fuel shelf" as it's called, is about 1/3 from the bottom. Now, normally (if memory serves) that measurement is used in stoves built with round sections (the tin can stove, etc.). It would be good to double-check this, but I imagine that it would make an opening that is closer to 1/4 system size.. Umm.. go to 1/3 first, then change it if it doesn't help.
Aprovecho cookers aren't my specialty, though there will be some similarities.
3 1/2 inch square is a bit small, though if everything is done properly, it should still work properly. For all openings upstream of the firebox, you should maintain CSA (Cross Sectional Area) throughout.. That is, however many square inches the pipe, should be the exhaust ports, pot gap, and all that. A 3.5 inch square has an area of 12.25 square inches.
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Post by edke6bnl on Apr 29, 2013 10:50:08 GMT -8
4 in round would then have if I did it right 12.56 sq. in.
UPDATE. I took another stick of 3.5 sq. about 24 in and set it on top of the flat plate and this thing is now burning clean and seems to be working. what I was thinking of doing was to weld on the 2 foot section and then put another flat plate on top. Then put a cut down 5 gal can to take up the space and have a door on it to serve as an oven. or I could just weld it up and insulated it. I did look around the place and found some really large round tube. conduit. I can not sacrifice some of the thick wall tube yet for this project It maybe use for other projects.
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Post by Donkey on Apr 29, 2013 13:53:50 GMT -8
Well.. When you get it just right, the metal won't last long anyway..
Make it with mud. (Natch-local or bagged)
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Post by edke6bnl on Apr 30, 2013 6:42:36 GMT -8
Well.. When you get it just right, the metal won't last long anyway.. Make it with mud. (Natch-local or bagged) that sounds good when I get the best design the clay material will be there for the stove to continue its work as if the steel was still there correct?? |
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Post by Donkey on Apr 30, 2013 9:03:22 GMT -8
If your clay is right, yes.
Look around here a bit. There are a few different recipes for lightweight, home-made materials.
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Post by edke6bnl on May 1, 2013 9:26:32 GMT -8
If your clay is right, yes. Look around here a bit. There are a few different recipes for lightweight, home-made materials. I have a good start most of the soil around here is like concrete and turns to soft clay when wet, I already purchased some perlite. so the next one will be a home brew. |
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