The logging job down the street was using 2 of those to easily take the largest of trees on the site which were probably up to 36" diameter.
the saw bar that does the cutting doesn't look to be more than 24" long.
the first three were the biggest ,if you figure ten foot long poles,the trees were only 30-40 foot tall,and the top was only 3-4 inches in diameter,at most.
wonder how it would handle a forked,or crooked tree?
