Cabling

Jeremy9

Jeremy9

Location
Rochester, NY
Has there been any long term studys done, on dynamic cabling syestems. I ask because New York just had there annual ISA conference, and there was a guy talking about cableing. He went out of his way to put down dynamic cabling, but never gave any reasons not to use it. When asked he said there has been know studys done on dynamic cables and he could see know advantage to using them.
 
I sure wish that the speaker would do some research. There has been studies done in Europe already. He is doing a great disservice to arborculture by dismissing an accpeted practice that has great benefits.

The whole concept of dynamic cabling is different than static. The reason for static is to hold the tree or parts, in place. The reason to allow the tree to move has been common knowledge for decades. Trees that move have stronger wood and better attachment unions. Dynamic cabling is used to slow the large movements of tree parts. Kind of a shock absorber. That makes perfect sense to most people.

Don't let what the speaker says dissuade you from considering the use of dynamic cabling systems.
 
I'm not dissuaded. It just sucks that the other 100 people in the room that were there to get new information, in the industry get told to keep doing thing the way your doing it. Because if its not broke dont fix it. That was his reason for using steel cables
 
Rick,

The same words are used in NY as you heard in N Eng. Is there any reason to believe that the source is different?

Frustrating!!!

Ivory tower research.

Editted note: See below, there is another speaker beating up on dynamic systems without doing any research. They're using thier position and "name" to speak from the bully pulpit.
 
This guy sounds like a choad and a wonderful source of misinformation.

Sounds like ISA need to do some research before inviting speakers.
 
[ QUOTE ]
I sure wish that Dennis Ryan would do some research. There has been studies done in Europe already. He is doing a great disservice to arborculture by dismissing an accpeted practice that has great benefits.

The whole concept of dynamic cabling is different than static. The reason for static is to hold the tree or parts, in place. The reason to allow the tree to move has been common knowledge for decades. Trees that move have stronger wood and better attachment unions. Dynamic cabling is used to slow the large movements of tree parts. Kind of a shock absorber. That makes perfect sense to most people.

Don't let what Dennis Ryan says dissuade you from considering the use of dynamic cabling systems.

[/ QUOTE ]

Oooo Tom. You are my man.
When I read the first post I thought "here we go again".
I am glad you were here second to (in your own way) set the records straight.

Dynamic rules.... /forum/images/graemlins/smile.gif and if you are too late at the scene and the damage is done you can try to save the tree with the "hardware". /forum/images/graemlins/wink.gif
 
The class in NY was given by Neil Hendrickson, a Ph.D. from the Bartlett tree research laboratories. He gave a talk earlier in the day on mature tree pruning, that was very good. But his stand on dynamic cabling was baseless. He even said he had know facts, it was just his opionion.
 
Thanks for letting us know who spoke.

Now there are two people spreading an opinion on a tool that has shown great benefit for saving trees. This is even more disappointing :(
 
I strongly recommend cabling and steel rod bracing as an option instead of removal of a tree or large piece of a tree, that can potentially be preserved.

Since Hurricane Juan hit us in Halifax, we have braced and cabled more trees than usual on a weekly basis than before the storm and have seen the benefits of these procedures in the following higher winds and wet, heavy snow.

Dynamic cabling is a useful, affordable and a highly recommended substitute to removal in some instances.

We also encourage the tree owner to get these systems and hence their trees checked by us every 2 years.
 
Can anyone provide links to those studies or references for printed sources? I've heard lots of anecdotal opinions, but I have not seen any data published from controlled, unbiased studies. There was an article in AN April, 2002 by Ken James, but that was about forces and loading, and did not look at specific types of cables.

How much stretch is there in the dynamic systems? Can anyone provide the elastic properties of the dynamic systems?

I don't think that the range of motion or the total motion would vary much between static and dynamic tree cabling systems. In both the static and the dynamic systems the cable limits the distance between the two parts of the tree. But both parts can still move and sway in all directions, as long as the other part does as well. Even if the dynamic system has 10% stretch (and I would guess that it has less than 10%) the tree parts are not moving that much farther than in a static system.

I think the biggest advantage of the dynamic systems is their capacity to absorb shock-loading, or what James called "snap-loading". James says that, although the highest, peak loads were rare and unpredictable, even during strong wind gusts, the ideal cable system would have more flexibility than steel. But, he also says that more testing needs to be done to understand the behavior of the dynamic systems.
 
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