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heat from lower piece ignites upper piece as upper contains heat from the lower, what are u burning it in?
Quote from: CZARCAR on 03/12/2011 16:00:57heat from lower piece ignites upper piece as upper contains heat from the lower, what are u burning it in?Right now I'm using an classic open fireplace, although eventually I'll get a more efficient stove insert installed. Now I'm burning fir & maple.However, I've had similar observations outside with campfires, as well as viewing the aftermath of forest fires.Generally if one has 2 pieces of wood in the fireplace, they'll be side-by-side, rather than stacked. There seems to be an optimal gap of maybe ½" or so.The match stick question is an interesting question. The match stick will often burn out if held horizontally, but will burn up the stick if held vertically. In the past, I've had troubles keeping a ¼" to ½" or so stick to sustain flames when pulled out of the fire, so perhaps size does matter.A few thoughts I had.I've heard that a fire essentially has to vaporize the wood before it oxidizes. Perhaps it needs either a small piece, or the radiant heat of flames on 2 adjacent surfaces to keep it hot enough to vaporize the wood and to maintain the fire, especially with the heat sink bulk of a rather large piece.One might get better drafting and air circulation with multiple pieces. Often one finds that some air restriction causes faster flowing air that seems to be better for the fire.Not all wood is created equal (more below)Forest fires are a natural phenomenon. Different species of trees may have adapted different strategies to deal with the fires.In tall conifer stands, a fire can sweep through a forest, wiping out the undergrowth, but leaving many of the mature trees unharmed.It is likely that trees like Cedars might burn more completely than trees like firs, even though the cedars are considered to be more of a slow growing secondary colonizer, and the firs are a primary colonizer. I've never seen green Balsa, but I've heard that Balsa is a primary colonizer, and I'd imagine that it would burn very rapidly. Since it is a primary colonizer, perhaps part of its strategy would be to stoke the fires.