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Rocket stove

 
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Hi,
my rocket stove refuse to work, turnes off.
Wood feeder is 4x6 inches and 45 degrees, air openings beneath is the same, and a heat riseris 6 inches and two feet high.
I even cut another openings on the bottom and rise it on the bricks so air comes freely.
It turns off anyway.
Does anybody knows what's wrong because l'm the only one wehose stove doesnt work.
I was planning to build rocket masonry heater down Here in Croatia.
Pleeeeeease HELP!
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Apprentice Rocket Scientist
Posts: 184
Location: Portugal
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I don't think cutting into the bottom is going to help it.

I assume this is a commercially-made stove from the look of it.  What is the small flap on the lower side of the wood feed for?  Is that some additional air intake? I would probably consider things like wind direction or poor fuel as a reason why it might not start.  I would expect if you once got it burning that it would continue to burn given good dry fuel.  

Experience has taught many people that steel is not a good material for an insulated riser in a mass heater such as the J tube type which Paul advocates for.  If you get it to burn hot enough to be really efficient it will start to destroy the steel.
 
master rocket scientist
Posts: 7204
Location: latitude 47 N.W. montana zone 6A
4414
cat pig rocket stoves
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Well, as Austin stated, the metal is going to deteriorate quickly.
The design is faulty.
The hunk of wood you have in the feed tube is way too large for a cold stove.
What you have there is a K-tube.  Known to be a poor performer. (They like to burn backward up the K-feed tube)
The extra air intake at the bottom is allowing too much air.
Why should it pull air down through your feed tube when it has a convenient alternative?
If you want this to work for a while, I see two options. Seal up the bottom air intake and let the air flow over your wood, not under it.
Or close off the angled intake and run this like an L-Tube.

If you plan to build a masonry stove in the future, start by assembling a proper brick J-Tube.
That metal K-L Tube is going to burn you unexpectedly, and it will not last.
Oh, and close off the extra holes you made; they really are not helping.


 
 
thomas rubino
master rocket scientist
Posts: 7204
Location: latitude 47 N.W. montana zone 6A
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cat pig rocket stoves
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Ok. I am looking more closely at your photos.
It appears that the flap on the feed tube could be an air channel. Is that so?
Why is it closed?
Was the bottom "air intake" originally closed and then cut open?

To run a thick metal stove, start with nothing but kindling, then slowly add larger wood as the metal heats up.
The hunk of wood you show in the feed tube is way too large for a hot stove; it is completely inappropriate in a cold one.

 
I think I'm turning Japanese. I really think so. This tiny ad thinks so too:
Rocket mass heater combo COMBO
https://permies.com/wiki/391869/Rocket-mass-heater-combo-COMBO
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