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I first arrived at 60,000 pounds for the log. But then I thought too hard and mistakenly used the 2,000 pound per ton figure, instead of the 6,000 pound per cord of Euc figure I intended. Sharp of you to catch this error.
Try this calculation on for size:
Average the log (6' + 12' divided by 2) out to a cylinder 9 feet in diameter.
Use the Pi X Radius squared X Length formula for cubic volume of a cylinder.
4.5' X 4.5' = 20.25 X 3.14 = 63.585 Sq. ft. X 40' = 2,543 Cubic feet
2,543 divided by 128 cu ft. per cord = 19.87 cords
20 cords times 6,000 lbs per cord = 120,000 lbs = 60 tons
A few observations: My view of a cord includes 15% air space. The bark also would weigh less than the wood for even more slop (I like slop). This could give a solid chunk of log, say, 20% more weight than split & stacked firewood.
After using a calculator, it is apparent that a 4 1/2 foot log 8 feet long equals a cord. For slop's sake, we can still call a 4 footer a cord.
I had no idea Live Oak weighs 9,000 pounds per cord, Euc is probably 7-8.
One time when working for the Hanover Brothers in Encino, California back in the early 70's, we delivered a 3 foot Euc log about 10-12 feet long to the McCulloch R&D facility in Santa Monica. They were developing a prototype electric wood splitter for the homeowner market. The euc wood was for them to test their machine on something substantial.
Later, we heard that the wood was so tough that the frame cross-member folded under the load from that immovable object, and the splitter collapsed. They never did get that product to market.
Here is a web site that does conversions automatically: <a href="http://www.mplik.ru/~sg/transl/capacity.html">http://www.mplik.ru/~sg/transl/capacity.html</a> Typing in 128 cubic feet, the result shows about 100 bushels as the equivalent. Not much good for cordwood.
An old tree appraisal computer program by Kim Coder gives wood volume in cord units. Have you seen it?