We have fired the second version of a minigama on a couple of occasions. The first firing went to about 2000 degrees. We are using a shop-vac to blow air into the kiln as opposed to any of the other suggestions.
The second firing went for three hours, used 20 lbs of charcoal and reached about 1950 deg. The cone kind of curled up. Not enough time, I imagine.
The 'ware' pictured is a three inch cup and a two inch extruded tube. They both got some glaze and a lot of 'crustys' but the finish is interesting.
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