ok here is a small lift test of a smoke cracker. It is from the lump charcoal bp. I just made a silver maple batch and that is the second video. It launched that smoke craker pretty good for such a short tube. 6" tall only 1" diameter.
Pure kno3 dusting sulfur lump charcoal premilled to airfloat then milled for 2 hours with proper amount of sulfur then added kno3/c/s to mill and milled for 5 hours.
I just made a batch of silver maple charcoal i am going to try next.
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