Correct me if I am mistaken, but a full cord of wood is 4'X4'X8' right?
So a face cord is 1/3rd of that, so 4' X18"X8' Ie it's based on 18" firewood pieces..
I'm not saying it's a legal definition, but it's the common unit of measure...
When I cut wood I try to average 18" (also the length of the bar I run on both saws, unless I get into a significant number of bigger trunks, then I put the 25" bar on the 362.
But for general cutting I prefer the shorter bar, make's the saw less nose heavy, and it keeps me from cultivating the earth at the end of the day when I'm tired! lol
I was wrong too, I store 31 face cords (or 10.3333 cords for those who don't like to do the math)
:D And I try to have at least a few face cords left over. That's burning from around the first of November, through April ish.. In the shoulder seasons I can usually get by only lighting the boiler every other day or so, if it's not too cold out...
Jon