Satamax Antone wrote:I have always heard, if it cracks, there is too much clay.
Have you tested your "dirt" for clay?
Silence is Golden
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Gerry Parent wrote:Staci, If you try to rip a (dry) chunk of cob out that has these cracks in it, does it have any integrity or mostly crumble?
Being one layer(?) and a bench (not a house supporting wall) I would probably not worry too much about it but use your best judgement.
From your picture, it looks like you could squeeze those red bricks(?) even a bit closer together. As Thomas pointed out earlier, rock holds more heat longer than cob does and also decreases the amount of cob you have to make.
If you think of it as a rock bench rather than a cob bench it might help.
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For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!
thomas rubino wrote:Smear some more mud around it. It will seal up. If it persists than try removing cleanout door and sealing with mud from the inside.
How is your dragon doing ? Is she waking up and roaring yet? Inquiring minds and all us permies would like to know???
For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!
For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!
For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!
thomas rubino wrote:Pop the top on your barrel and check your riser. Make sure that is clear. If necessary go on the roof make sure nothing blocked you up there.
Otherwise might just be the cob sucking up your heat.
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thomas rubino wrote:Good Morning Stacie;
I guess I did not understand your post yesterday. I did not realize you were having the super draft issue again.
This is very uncommon, most people do not have enough draw... What did you do ??? You bad rocket scientist :)
LOL don't worry with help it can be figured out.
For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!
For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!
For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!
thomas rubino wrote:Yes, mine is an 8". I have never done a 6" build so I am not familiar with temps it should produce.
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For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
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thomas rubino wrote:Hi Max; Draft Stabilizer ? Do you mean a damper ? Or maybe one of those spinning caps for the chimney ?
God of procrastination https://www.youtube.com/watch?v=q1EoT9sedqY
Satamax Antone wrote:Stacy, i don't think too much draft can exist. Well, that's just my opinion.
Realy, what would be interesting, is a video of your fire. Post it on YouTube.
But instead of chocking the heat riser. I would rather use a draft stabiliser. Just an idea.
Satamax Antone wrote:
thomas rubino wrote:Hi Max; Draft Stabilizer ? Do you mean a damper ? Or maybe one of those spinning caps for the chimney ?
God of procrastination https://www.youtube.com/watch?v=q1EoT9sedqY
Staci Kopcha wrote:Today I have dubbed it the "Bad ass rocket mass", affectionately.
I combined some suggestions (Satamax and Thomas) on getting her started, and it was lit in no time. Fire did almost go out, but then I got it going again. There were waves (and noise) of strong gusts of pulling air; I kept looking for wind outside, but it was still. Not sure why this happened...?
I climbed onto the roof (many times) and kept sticking my nose in the exhaust; I am pleased to say that I achieved clean burn and mostly steam! (Paramount to this tree hugger.)
After a solid hour of burn time, I took the following temp. reads:
Barrel side: 170 degrees F
Barrel top: 250
ducting:
direct out of manifold: 110
after first 90 degrees: 90
after first 180: 84
after second 90: 80
before chimney: 76
vertical stove pipe:
at 1 foot: 80
at 2 ft: 85 (multiple reads, think the spike is do to heat transfer from the barrel)
at 3 ft: 82
at the ceiling: 78
Mass on either side of ducting: 64, 67
Out chimney (roof) 63
Thoughts:
1) I feel better today after the second burn.
2) There is a very strong draft, I am not sure if it is going to be a problem. (Any thoughts based on my temp readings). I have put off cobbing in fear that I will need to change something.
3) The fuel feed looks like a toilet, so some fancy cobwork/sculpting needs to happen
4) I need to get busy with my lot of disorganized wood. Sorting, cutting. Small tinder is something I did not anticipate and need to accumulate. Worried that I may not have enough. I have read so much about the importance of "good quality firewood" that I feel some trepidation about putting "unclean" fodder (pallet wood) in my B.A. heater.
5) I am wondering how all of that bench mass will get heated up by 80-90 degree ducting. AND how much wood that will take.
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Dan Hatfield Ii wrote:
Staci Kopcha wrote:
Hi Staci,
Would you (or anyone else) happen to know what the temperature at the highest point in the feed tube is when the fire is burning well and truly please?
I'm trying to come up with something to cover the whole top of the feed tube (like a granite top )and don't want it to crack.
Thanks
Dan
thomas rubino wrote:Hey Dan;
Most of us just use a firebrick or two. I have a pair of insulated ones, very light that we use to close off the feed tube after the fire is done for the evening.
We never try to neck it down while running. That would defeat the purpose, I want my rocket to roar... its the only way to get a complete burn. Choking the feed tube does increase the velocity of your incoming air and is a good way to help a struggling fire, but you certainly would not want to close the feed tube entirely, you would create creosote and ash... two of the things that the high level of combustion normally eliminates.
Having said that I suspect that a thick piece of soapstone would work.
For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
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thomas rubino wrote:Hey Dan;
Most of us just use a firebrick or two. I have a pair of insulated ones, very light that we use to close off the feed tube after the fire is done for the evening.
We never try to neck it down while running. That would defeat the purpose, I want my rocket to roar... its the only way to get a complete burn. Choking the feed tube does increase the velocity of your incoming air and is a good way to help a struggling fire, but you certainly would not want to close the feed tube entirely, you would create creosote and ash... two of the things that the high level of combustion normally eliminates.
Having said that I suspect that a thick piece of soapstone would work.
For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!
them good ole boys were drinking whiskey and rye singin' this'll be the day that I die. Drink tiny ad.
Rocket Mass Heater Jamboree And Updates
https://permies.com/t/170234/Rocket-Mass-Heater-Jamboree-Updates
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