Aerial Rescue

These are good points you both are making, Tom and Mahk.

I got a little worried when you said originally that you would not let a climber use that setup, because I had seen a lot of that in OHIO, and it passed my inspection. (Note- I would always defer to gear heads like TD and Mahk on issues of safety and rigging).


Hey Mahk, good article on DdRT in the latest Arborist News.

SZ
 
You also let it slide when cory and I did our run throughs after setting it up...Oh wait a minute, never mind
devdude.gif
beerchug.gif
 
I have to agree with Tom on this one. The rope should absorb the shock. Sliding down a foot can create a huge shock load, especially with 2 people on the same line.

I say snug the stopper knot just underneath the prusik.
 
In Arbor pic, wouldnt it be better to take out the prusik all together so there is no worry about slipping at all?
Instead put a directional eight in the line as a false croch and work off of that. For a back up in case that were to ever fale just put a second one below it and tie it into your system. Now no matter what, there will be no slipping in the system.
 
[ QUOTE ]
Hey Mahk, good article on DdRT in the latest Arborist News.

[/ QUOTE ]

Thanks Easy. Part 2 will be in the August Arborist News.

Like Guy (here:

http://www.treebuzz.com/forum/showflat.p...=true#Post89457

and elsewhere) I sometimes wonder if anyone reads all the stuff that we write and what they think about it.

On the other hand, I don't just email someone to say "Hey read your piece...!", even if I know the author. I might mention it in the course of conversation (email, phone etc.), but otherwise I just read it and go on.



Tom wrote:

[ QUOTE ]
Since all of our system strengths have been 'tested' or calculated for the climber's load only I'm nervous about seeing increased loads on the hitch.

[/ QUOTE ]

Have they been "...'tested' or calculated for the climber's load only..."?

[ QUOTE ]
In the US the National Fire Production [Protection] Association standard for rescue gear is based on a two person load rating.

[/ QUOTE ]

What is the MBS for that gear, including the rope?




Norm wrote:

[ QUOTE ]
I have to agree with Tom on this one. The rope should absorb the shock.

[/ QUOTE ]

I understand your (yours and Tom's) theory, but I just have a bit of nagging uncertainty.

One of the reasons that we use a frition hitch in a Z-rig is so that it will slip, rather than break, if it is overloaded. The Rope Guide now has a built-in shock absorber that rips/slides down the webbing in the event of a shock load. Shock-absorbing lanyards slide and/or rip in oreder to reduce impact forces, and some of the cammed (not toothed) ascenders are advertised as 'Slips at...' a certain load to reduce shock and decrease the chance of severing the line.


Hmmmmm..........
 
You must log in or register to reply here.

New threads New posts

Back
Top Bottom