thank you so much for your input. It is especially nice to know about the recycling baling twine.
I understand the part about different gumbos. That in Texas is way different than ours in Montana. My next step before adding the mass to the stove is to do the quart jar test, allowing the sand to settle first, then the silt, and last the clay and find out what percentages I have in our test sample.
BTW, CSA = Cross Sectional Area, which should be about equal from intake, to burn chamber, to riser. The riser being 6", pi x r (2) = 28.4, so we had to make the intake and burn chamber about 4.5 x 6 inches. When we did, boy did it "rocket"! Also, discovered the length of the intake and length of burn chamber has to be less than the length of the riser. We are now going to have to experiment a bit to find out what it will take to burn coal, as my friend has a seam that the original homesteaders used to keep warm in winter. The increased heat may mean that the riser will have to be built out of fire brick to keep the riser from melting!
Not planning on making any earthenware, was just curious if anyone had, especially from our area. Never hear of anyone doing it, so volcanic ash content may be too high/low.
Thanks again for your response. Would love to meet you if you make it out to Montana. Unfortuneately we have few trees for an arborist to look at!
But there are lots of prairie dogs to act as targets. Figure an ex-Marine might enjoy that.