Rigging rope

[scudmonster]

Any one using dyleema? Thinking about it for a pulling line but whats the experience of lowering/ speedline?

 

 

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[Swampster]

Do you mean dyneema?

[treequip]

Dyneema isn't much good with heat so if you are using a friction device for lowering there are better alternatives

 

It can be used for a speedline if its a slowline, you need to run it on a pulley and possibly a tagline to stop the hardware getting warm but again thee are alternatives.

[WorcsWuss]

Not great for shockloading either is it? - Slow pull good, V. strong. Dropping lumps bad, low stretch...?

[Alinicoll]

Not great for shock loading either is it? - Slow pull good, V. strong. Dropping lumps bad, low stretch...?

 

That`s my understanding. Certainly for making slings dyneema makes thin strong sling but they don`t handles dynamic loading well. Somebody posted a video a while back comparing dyneema slings to polamide slings on dynamic loading.

 

How to Break Nylon & Dyneema® Slings [Vid] — DMM Climbing Equipment. Innovative climbing gear, made in Wales.

 

Not a speed line I know but worth bearing in mind.

[treequip]

Agreed, the low elasticity is also a problem, particularly with slings because of the fixed length, its a little better with rope because there is (usually) much more of it in play and as such more elasticity.

 

Still not the best use for dynema and there are better alternatives

[woodyguy]

With about 1% stretch and being very thin for the strength and expensive it's not great.

A 6mm dyneema will take the weight but its horribly thin to handle and pulleys don't run well on it. If you use 12mm it handles better but will bankrupt you. Good for whoopie slings bad for rigging.

[MOG]

woodyguy that makes them even worst for Whoopie.... where do you think all shock/force goes when rigging down?

 

as stated above only for static loading, its amazing but for dynamic its not good. and especially not whoopie/loopies or rigging slings etc etc. Amsteel has less strech than cable, would fancy have rigging slings made out of cable ay...

 

hope that helps, that vid is good to watch to understand abit more too.

[woodyguy]

Interesting comment. Not all parts of the system need to have stretch. A whoopie a few centimetres long will have minimal length of stretch whatever its made of. A dyneema whoopie is incredibly strong for its thickness. connect it to a nylon rope for lowering and you've got a system that will take shocks very well. What would you wish to make whoopies from by the way?

[MOG]

Ditto on the interesting comment lol,

 

where do you think the maximum force goes into/from a rigging system?

 

i wish i could draw a picture on paint, alas the Mac...

 

Anyways so.... standard rigging system 100kgs log weight means 100kgs on one side of rope and 100kgs on the other side. So this means pulley has 200kgs. Pulley is attached by whoopie thus taking maximum load? in my mind anyway. so this area needs to be the strongest, you dont want that flying down as well as the log ay. (you dont want either really...)

 

i suggest Tenx Tec 16mm whoopies/loopies or deadeye slings/knots for big stuff. knots/hitches work as a energy absorber.

 

have a look at few books or try drawing so diagrams, i know that helps me work stuff out sometimes. Hope it makes abit more sense?