So, I've been doing my own drying test for a little over a month now, but I used smallish pieces to speed up the process (because I wanted data FAST!). I used freshly bucked and split red oak heartwood and tried to keep the pieces as uniform as possible. I cut eight pieces altogether, four large (those numbered "1" on the charts, about 2-1/4" X 3" X 4-1/2") and four small (those numbered "2" on the chart, about 1-1/8" X 2" X 4-1/2"). Starting MC was too high for my meter, so somewhere over 50%. I placed one large and one small piece in each of four locations: A = a wood bin in a heated indoor living space; B = an unheated but closed garage; C = the top of a covered outdoor firewood rack; and D = the top of an uncovered outdoor firewood rack.
Some of the results were as I expected but others were a bit of a surprise. The smaller pieces dried faster than their larger counterparts, and the indoor wood dried much faster than any of the outdoor samples (because the air gets pretty dry in here during heating season). The wood in my garage dried much faster than I expected, outperforming the outdoor samples during all but the warmest weather. The uncovered outdoor wood dried the least, but it's been pretty wet and only recently warmed up. You can pretty clearly tell when we got precipitation by the blips in the chart. When the weather was favorable, the uncovered outdoor wood dried more quickly but still not fast enough to make up for the exposure to precipitation. I'll keep tracking this for a while to see if the uncovered wood catches up and then eventually oven-dry the wood so that I can convert the charts to a moisture content scale. But for now, here are my results (chart 1 = larger pieces, chart 2 = smaller; normalized to account for slight differences in sample size):
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