To Run or not to run or that is the question?

[TimBr]

Just to make what the other guys are saying explicit, velocity does not have any effect on the rigging/anchor, only changes in velocity. With 80' of room, you wouldn't be able to tell the difference between a piece I rope and the wind on your rigging point, and my leather gloves would look like obsidian.

In summary, I concur with Steve: asshat alert.

Sent from my XT1080 using Tapatalk

Wow, I just re-read your post, and finally understood what you were saying, I think. I don't know why I did not pick up on it the first time.

If I'm reading you right, you are saying that you are able to run the rigging rope on the friction bollard, (sometimes called a Port-a-Wrap), so smoothly when allowing a fairly large piece of wood to be dropped into it, that the climber at the top of the stem would feel next to nothing at the top of the spar, in terms of vibration or wobble of the stem.

That is really saying something, and I would love to watch you work. Good on ya.

Tim

P.S. Thanks for taking the time to point out the physics of the situation, with regard to the change in velocity, not just velocity itself, as being the determining factor in the amount of stress exerted onto the rigging. Very helpful point.

 

[CanadianStan]

Wow, I just re-read your post, and finally understood what you were saying, I think. I don't know why I did not pick up on it the first time.

If I'm reading you right, you are saying that you are able to run the rigging rope on the friction bollard, (sometimes called a Port-a-Wrap), so smoothly when allowing a fairly large piece of wood to be dropped into it, that the climber at the top of the stem would feel next to nothing at the top of the spar, in terms of vibration or wobble of the stem.

That is really saying something, and I would love to watch you work. Good on ya.

Tim

P.S. Thanks for taking the time to point out the physics of the situation, with regard to the change in velocity, not just velocity itself, as being the determining factor in the amount of stress exerted onto the rigging. Very helpful point.

That's how I expect anyone on the ground to rig a piece (with an 80' drop ... )

The Port-A-Wrap is the brand name of one specific device. Stein makes a similar one, the GRCS is another type, the Hobbes is another ... just different brands of the same idea of tool. They're all a bit different but all get the job done.

 

[RajElectric]

Tim, it's the same idea as letting a throwbag run, stop too quick it will swing and get tangled. Make it a heavy piece, the rigging point has to react (sway and shake, snap?)

 

[Worthaug]

That's how I expect anyone on the ground to rig a piece (with an 80' drop ... )

The Port-A-Wrap is the brand name of one specific device. Stein makes a similar one, the GRCS is another type, the Hobbes is another ... just different brands of the same idea of tool. They're all a bit different but all get the job done.

Brand names for the general term of friction bollard.

Reed Wortley
CTSP #01739
ISA CA #SO-6953A

 

[classictruckman]

I think there may be an echo in here...

 

[Worthaug]

Where? Where? Where? Where.....

Reed Wortley
CTSP #01739
ISA CA #SO-6953A