Strange rope question

We have a job coming up in work using a lot of 6mm Dyneema.....3000m to be exact.

Does anyone know how much this is likely to stretch when loaded up to about a tonne & a half?

Peaky is right but be careful. What the supplier will quote is stretch but you must also consider the creep.

The individual strands will stretch STRETCH
The overall rope is made of many woven strands and as they straighten the rope appears to get longer CREEP

We fell foul of this when we used a hell of a lot of vectran in the Invictus C-class cat. The vectran hardly stretched but it crept a huge amount over the long lengths used to the point that we couldnt deflect the trailing edge when under load even though we'd pulled about 4ft through the cleat!

Edited by craiggo

so which is the one that doesnt creep? and is it not easier just to use wire?

I'm intreeged into what he wants a 3000 metre piece of high tech rope for!

Originally posted by asterix I imagine he's setting up a river ferry crossing using a winch

I`m having trouble now,why would you imagine that?

I for instance imagined a well attended group bondage party!

Edited by bert