Today was the last full day of experimenting and these are the results after a 6.5 hour continuous burn.
Beginning weight of coal 57#
Beginning volume of coal 1 bushel
Ending weight 3.5#
Total Coal Burned 53.5#
Final ash weight 5.35# / 10% by weight
Final ash volume .23 bushel / 23% of original volume
Note: The ash was not compacted in any way.
There was no unburned coal and no large clinker. No clinker any larger than 2 inches; exactly the same as anthracite clinker.
There was concern voiced about clinkers not falling off the edge. I tried to video but after radiation burns, I decided to take pictures at half hour intervals and one video of a large clinker falling off.
Note the clinker in the back right corner and front left corner.
Half hour later, the rear right clinker had fallen off and the front left clinker is growing.
Half hour later, the front left clinker was ready to fall off and I took this video. The ash falls off from the middle to the end of the video.http://www.youtube.com/watch?v=D0a0B1nqsLw
This is the pot with the clinker gone.