Pick weight is the inverse of girl weight. If you want to stay alive in the trees, guess heavy . . .
There's a tree company here that rolled their crane while removing white pines for hydro one, in the news paper article he was quoted saying "we work with a safety factor at all times, there is a 15% safety factor built into the crane's load chart".
That 15% is there to make up for being slightly off level, minor ground imperfections, crane age, etc. You should not be counting on it to save your ass.
Yep, do and have done plenty. With veteran ops and with newbies to trees. checking pick weight throughout the day is good. When I get to the wood, I'll reference the log chart in my head, check it against the actual then adjust my calculations. There's plenty of time to figure out the weights between picks. As for the LZ determining pick size, sure. I've worked with LZs that leave me with tons of room to go as big as I can (thus the need to calculate pick weight) and those that limit the crown picks substantially. Being able to run the numbers makes for more efficient operations. But those numbers are relative to the equipment used, the wind, the time of year, LZ and it's distance along with the farthest pick on the tree. So, instead of the op being snide with the newbie, he could put down his paper and teach the kid something.Do you check the green log weight table on every pick and then check the chart then confirm the pick weight afterwards? Do you even do any crane work?
Like I said, it is good to occasionally check "pic (pick) weight accuracy" (topic) for future reference...but regardless of your statement re contemporary equipment and the need to "learn and utilize the latest tools available" the fact still remains that the only way you will know the REAL green log weight (or green leaved weight) is AFTER the pick (with no ability to turn back). Most often the piece is taken to fit into an LZ or on a log truck etc. so imo...charting and guestimating weight on EVERY pick...a little silly and even unprofessional. Get the thing down and move on.
Op to newby crane climber: "whatcha ya got there son?"
NCC to Op: (shaky voice)..."I got about 3k here sir, hu hu hu hu how much we good for?."
Op to NCC: "We're good for 12k, now cut the damn thing off and let me get back to my newspaper."