Brian (a.k.a Ziggy) recently reported on his blog that his rocket stove is not working. This is a handmade masonry heater he built by hand from cob, firebrick, and steel. It’s a very clever design that has the flu flowing through the cob bed platform. The problem is that it doesn’t draw unless there is a bit of a wind outside. His cob house is located at the Dancing Rabbit Ecovillage.
I took a careful look at all of Brian’s photos and pulled all my old kiln building notes & memories out from my past as a potter and came up with a modification to his design. I’m not sure he’s game to give it a try, but I suspect it would work better with this modification.
Basically I’m simply suggesting that he digs into the cob a little and connects the stove to the rear exit pipe leaving the other two pipes (white) burried in the cob and disconnected from the system. This would make it much easier for the air to flow because there are fewer turns and less horizontal pipe. My other suggestion is to experiment with a taller chimney.