I had problems with wide bases when I did not open my cylinder wide enough at the base with my initial opening of the clay. I then tried to widen it with subsequent pulls. When I opened to the right base width initially my thick bases went away as I pulled the walls.
My stem wall can be 21" or 25" tall. Would it be better to have a 21" wall and a 12 " arch ( I have already made it) resulting in a height of 33"; or use a 25" wall with a NEW arch of 7" rise which would make a total height of 32" ?
For a forced air (power burners) downdraft kiln, what is the chamber size to flue ratio? Just rechecking everything...