throwing a big oak top over 15'

[easy-lift guy]

Let's here a A Men for Woodpicker, AMEN!

easy-lift guy

[Pat Ferrett]

Awful spelling but the right sentiment, if someone has the guts to post photos or videos of their work good or bad I applaud them.

 

Guilty as accused

[Adam Bourne]

 

 

what cut did you use dadio???

 

 

what was the reason for the take down?

 

 

your MEWP is fast!!!!

 

 

Why not just climb and dismantle? do any of your jobs not go to plan?

 

thought i would repost my original post again???????

 

seem as though it never got answered??????

[dadio]

I personally feel that after i simply ask a question as to how you can calculate the reaction and factors of such a task i get a response from "a fellow tree surgeon" who appears to respond in a manor that i feel is dam right rude and patronising .

 

It is this attitude that leaves me wondering if i want to view another of his posts and certainly do not feel there will be a time that i wish to comment or ask questions .

 

If you wish to comment in that maner that you do then expect to recieve the same back simples

 

Are you refering to this answer? :

"As with most aspects of falling and rigging, it is accomplished more by feel than calculation.. That "feel" is best achieved with a full understanding of the physics and ALL the factors involved.. which include, the weight of the piece, the lean of the piece, the amount of pull (force, momentum, and acceleration), the placement of of the pull line in the tree, the direction and angle of the pull, the dynamic properties of the line, the amount of line in the system, the unlimited different options in cutting a notch and backcut (and most importantly the depth and width of the notch), the height of clearance . All of these things must be considered..

 

There are just too many factors to develop into some kind of practical calculation..

However, its not that hard to develop a feel for all the above with a little practice and experimentation. I have also found the use of slow motion video helpful in understanding how a piece moves off the cut..

 

In this case, I wanted to take more of the top, so that the one lower back-leaning lead came out with the top.... BUT I JUST KNEW, that if I cut that top that low, it would not leave enough height to provide the clearance needed.

 

In the end one of the major factors is left to the driver/vehicle, so you need to be able to trust him..We did not pre-tension the pull line.. there was a little slack left in, with approx 150' of dynamic 1/2" true blue. The top was fairly well balanced with a slight side lean away from me.. I cut the backcut until the kerf started to ever so slightly open, then called for the pull...By the time the truck took the slack and the stretch out of the line, there was enough momentum to get the piece to move just enough faster than it would have naturally, to clear the maple and the shrub. I only wish I had a dyno to show that with enough stretch in the line and enough line in the system, there is very little shock loading, and therefore a remarkably small amount of force on the line, which I would estimate to be less than 20% tensile strength.

 

What makes this sort of thing fun for me, is to see if it will work as planned. However there are just too many factors to be absolutely certain. I would rarely take that kind of chance with valuable objects at risk. In this case I was certain that there the Jap maple would be cleared, but the shrub was 50-50.. I would not even have done that if I didn't have those padding logs set up. They were at least going to protect the base of the srub from total destruction.. If the top sustained damage, it could be pruned and the shrub would certainly recover completely in time. That was a tolerable risk.. It worked.. made a good video, and was fun... NO big deal!"

 

If so, I think you have misinterpreted... That is quite a full and complete explanation of all the factors involved and my thtought process about the job, which took some time to write out.. I thought you asked the question in good faith, and I did my best to provide a complete and unambiguous answer. WHy would you consider that rude and patronizing?

[dadio]

thought i would repost my original post again???????

 

seem as though it never got answered??????

 

Your questions got a little lost in the upheaval..

 

the cut was a narrow humboldt, somewhere around 30-35º, with very little stump shot on the backcut..

 

Customer wanted to take the tree down because it was lifting the driveway, and made him feel unsafe.. I told him the tree was sound and with some pruning and a cable or two, the tree would stand for many years. I recommended against removal, but he just wanted the tree down..

 

There was no need to climb and dismantle, I could have rigged out that entire top without leaving the bucket.. The drop was faster, much faster, but there were other reasons as well. It was the first day that a highly experienced arborist was working with the crew.. I wanted to show off a little for him, so he would get a better understranding of the our skill level.

 

And yes things do from time to time go unexpectedly... and I take those times very seriously, even when no harm is done.. I want to know "why?".. Kind of like an accident scene investigation after a plane crash.. I only get peace after I understand exactly what happened. Many years ago, I lost a big oak spar 45º to the intended lay.. By some small miracle, the tree landed in a narrow gap between a 50 year old dogwood and a brand new shed.. No damage. I stopped all the work and would not allow the log to be moved until I went home and returned with a camera.. Topok over 150 photos of the stump..

[butler]

forget about the tree work, American's are awesome.........

 

"No chap's again guys"

"I don't care the trees on the ground"

"I want you to say hi to Dave" p.s. (Hi Dave)

 

Dadio, I wouldn't use most of your tecniques, not because of my inferior i.q. , just because I think mine work better for me...... that said I do find your videos entertaining and they do bring a smile to my face

And Daves well buff!

[Adam Bourne]

Thanks for the reply dadio.....