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Summary

Paul finishes up with his last remaining instructor, Lisa Orr, along with Chris McClellan, aka Uncle Mud, on the subjects of rocket stove tech and wild clay.

The nice J-tube for the kiln came to around $1000, most of which came from the ceramic board insulation ($600), although the cost of insulation can be brought down to $150 or less by putting the J-tube in a trough, covering the seams with cob, then filling the trough with sand.  Considering a new kiln of the same sort as the dud donated one costs around £3000 and demands “220 power” so it’s quite likely to have to wired in specially, just to add to the cost, even using the expensive insulation only brings the Rocket Kiln up to a third of the price and can still be fired for £3 or less.  Although this assumes you have a dud kiln lying around somewhere.  There’s also the point that seeing as the fuel is a fairly small amount of wood, you don’t need much if any infrastructure to support a rocket kiln, allowing remote areas to fire pottery without getting power lines and installed.  Heck, thanks to the much cleaner combustion, you can bring the kiln into the immediate settlement without worrying about smoking the area out, which is a problem with a local kiln program going on in Mexico.

In a somewhat gross turn, Mud often sees piles of plastic garbage when he’s off building houses in mountainous parts Jamaica and the locals tend to get tired of them and set them on fire, resulting in poisonous smoke that makes everyone in the area ill.  Mud hypothesizes that he can use the garbage to fuel the kiln where it will, in theory, burn more cleanly.  


Relevant Threads

2023 Permaculture Technology Jamboree website

8-Inch Portable Modular Rocket Engine with Forge, Crucible, and Kiln Attachments
Rocket Stoves forum

Harvest Clay and Make Pottery! (oh yeah, and the rocket kiln)

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