Rigging Setup Design Factor Poll

What design factor do you PRIMARILY use on your rigging systems (not crane)? Choose up to 2.

  • Hardware 10:1; Rope 10:1; Rope MBS similar to Hardware MBS

    Votes: 5 33.3%

  • Hardware 10:1; Rope 10:1; Rope MBS somewhat weaker than Hardware MBS

    Votes: 8 53.3%

  • Hardware 5:1; Rope 10:1; Rope MBS similar to Harwdare MBS

    Votes: 2 13.3%

  • Hardware 5:1; Rope 5:1; Rope MBS similar to Hardware MBS

    Votes: 0 0.0%

  • Hardware 5:1; Rope 5:1; Rope MBS somewhat weaker than Hardware MBS

    Votes: 4 26.7%
  • Total voters
    15
Birdyman88

Birdyman88

Branched out member
Location
Arlington
It seems that when you get info from different manufacturers, suppliers, and users you tend to get different answers. I've always used Hardware 10:1/Rope 10:1; rope similar strength to hardware; mainly because it makes things easier for my brain with all parts having same WLL. Occasionally, I will let that same system hit a lower safety factor, usually in dynamic situation but the idea is still that all parts have the same WLL, and that I know what the numbers are expected to be. Just thought it would be interesting to see what everyone out is using.
 
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My rigging often fluctuates somewhere between 10 and 5. I like to pick a middle of the road line for the job and cut accordingly. Switching lines during a climb is sometimes necessary, but I try to avoid it as much as possible.

Yale polydyne 9/16 is my go-to line. Light enough for small rigs, strong enough for somewhat larger rigs.
 
Crimsonking said:
Yale polydyne 9/16 is my go-to line.
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Same here, but 1/2" and 3/4" for my mechanical rigs. Highest EA factor out there I believe without going full nylon. Interestingly, Yale publishes the EA factor for 20% MBS, hence part of the reason for this thread. I had to calculate it for 10% MBS since that's what I use. But I keep both numbers handy.
 
Not sure I follow as far as the MBS part? Of you are asking 10:1 rope 5:1 rigging hardware, then the mbs of the rope will be higher no?

Most manufacturers of hardware determine the wll at 7:1 or 5:1. Rope is almost always 10:1 because of the way it breaks down with the damage we do to it with shockloads and heat...etc.
 
Mark Chisholm said:
Not sure I follow as far as the MBS part? Of you are asking 10:1 rope 5:1 rigging hardware, then the mbs of the rope will be higher no?
Click to expand...
Yes it would should, but I relent to dive too deep into this as I am looking to see everyone's first unbiased response. I almost didn't included anything but choices 1 and 4, but after a mind twisting discussion with a supplier, I am convinced that choices 2, 3, 5 are being used in the industry, but it is really just semantics and how people look at their numbers that allow them to be legitimate. I think that setting the rope as the limiting factor is being expressed in different ways, correctly or not. Hope that makes sense.
 
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But seeing how many responses #2 has, I'm starting to accept that this supplier has a point. Again, it's just how differently everyone digests and communicate the numbers when certain parts of the system are purposely allowed to have a different WLL.
 
10:1 rope, but this is a trade-off with the amount of elastic dampening response returned.
So, 20:1 tensile impacted, can ruin day that a 10:1 wouldn't, by shocking support etc.
>>Doubling rope to 2:1 support thru pulley has same effect of increasing Load capacity @ co$t of elastic dampening.
Simpleiowaguy said:
I'm with Mark. 10:1 on everything and keep rope as the weakest point
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The wearable, replaceable, soft device as the fuse/weakest link as in other disciplines.
i choose matching, then let the rope deformity Naturally degrade rope to be the lesser.
Round host mounts rule! More important on shock load for rope to not be too much more stronger, but can max out hardware tensile. Round Hosts Rule !
.
Gotta watch manufacture numbers; i always want to know the tensile and decide my own ratio for comparison.
Major manufacturers have great testing but still Observer Effect as humans (even up to Hawthorne Effect of being watched),
especially when runs into policy of either boasting (even Freud found : "Ego is not yo'Amigo")highest possible, or most conservatively for most CYA headroom against litigation etc.
Lawyers can taint even a rope test, purest results w/o.
 
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