Erica and Ernie's plans might be helpful but the book is usually the first place to start for something like this. When designing the flue you want to keep in consideration that you would have to clean this thing every once in a while and the more complicated you make the exhaust the trickier it's going to be to get in there. If you want to use a vertical stack chimney it sounds like you will need some extra heat left in the exhaust to get the gases to rise. Ideally a hole in the wall would be the best exhaust, but if you are renting it might not be an option for you.
Gryphon Corpus wrote:So the Ianto Evans book is the way to go, not the Erica/Ernie plans?
I saw that video and was thinking something like that. But what keeps the wood from catching fire? Can I build a sturdy insulated wood platform and then cover it with cob and surround it with a cob bench with the flue running through it? I'm envisioning a bench that wraps around the stove rather than sticking out away from it, just to use the space better.
A handy friend... I'll see what I can round up. One of my employees is good at that sort of thing; I'll ask him. I was just kind of hoping to find someone who had actually built an RMH before.
Satamax Antone wrote:Gryphon, check this http://donkey32.proboards.com/index.cgi?board=experiment&action=display&thread=511
They last a smidge more on their wood.
You could replace a window with a board and a hole cut in it if that's an option, chimney would lose some heat but I have no idea how much or how much it would effect the rocket-y-ness. A chimney adds one more dimension to cleaning and also needs to be properly sized for the system, may limit how big you can go. At this point I would think you could make this thing big and pour some heat out of it. As for the mass, cob=work to me so I would be thinking along the lines of loose mass that can be delivered by truck for cheap and it would keep labor down, pea gravel for instance. I would like to think you could do this whole thing hand mixing little or no actual cob but maybe a slurry in a batch mixer and dumping it in... Others on this board would know more on the best mass to use for a job like this, there is kind of a theory to it I am sure.
Gryphon Corpus wrote:Book downloaded.
That makes sense that one as to be able to get into it, and to have enough heat to drive it up the chimney. I don't think my landlord would care for me punching a huge hole in the wall, especially when there's a great big chimney in the middle of the building already. But it does go up a good 15-17 feet, if not more. Will that be a problem? Will I lose too much of my heat up the chimney? And how does one make a pipe inside a cob bench accessible, even if it's straight?