The Forestry Forum
General Forestry => Sawmills and Milling => Topic started by: jrkimroxie on April 04, 2010, 12:24:21 AM

How do you calculate the weight of SYP log 16' long with 18" but end with 14" small end??

Look below the list of sponsors to the left and find the little red toolbox. Click on it and go to the log weight calculator. For the weight, you should use the average diameter of the log, or the diameter at the balance point. For your log, 16" should give you a pretty close idea. Don't forget to adjust the calculator for the species, or you'll be finding the weight for an Ash log. ;)

Some such functions are not back up yet because of the forum move and I'm not sure that Jeff might have to do some behind the scene work to get this function going again. But, I think it is mostly domain name issues until the new IP address gets recognized as the forestryforum.com instead of a number. It being the weekend and a holiday those gurus have a life to. ;) ;D

I think weight is calculated as follows:
Pie x average radius (8") squared times length = area
weight = area x weight per square foot
3.14 (pie) x 8"x8" x 16'
3.14 x 8"x8" x 192" = 38,584 cubic inches
cubic feet = 38,584/1728 = 22 cubic feet
Average weight per cubic foot (1728 cubic inches 12x12x12) is about 55 pounds
22 cubic feet X 55 (weight per cubic foot when wet/green) = 1228 pounds
http://wiki.answers.com/Q/What_is_the_weight_of_southern_yellow_pine_in_pounds_per_Cubic_foot
It is easy to make a mistake but that is how it would be calculated.

The forum's log weight calculator:
http://www.forestryforum.com/calcs/log_weight.htm
Your calculations come out close as long as you are measuring at the midpoint of your log, and you have a species that weighs 55 lbs/cu ft. Not many fall right at that range.

all them numbers could drive a man crazy ,but the calulator in the tool box does it all for you! ;D