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Topic Date User

Double rope diameter/ratings 14-Jul-2011 At 9:07:16 AM oldgranite

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Hi,
So I am thinking about trying this double rope thing. I have tried it with my single 10.5 tied into the middle and like it, and want to try it on longer routes. I have done a lot of reading online including the tech tips page but can't find the specific answer I'm looking for.

My question is this: Can I use double rope technique with ropes of different diameter/rating? For example, to save me buying a whole new set of double ropes, could I keep using my 10.5 and pair it with another single (say a 9.5) or a 'double' rated rope (say a 9 or even a 8mm?). Will the difference in stretch and rope diameter cause issues?

I understand (I think) the difference in ratings, but am interested to know if this would create real world issues when two ropes of different elongation/rating/diameter are used together in a double (or twin) rope system. Also, are the ratings of ropes setup so that 'single' is always 'better' ie: would using two 'single' ropes, of the same rating/diameter/manufacturer in a double or twin system be generally better than using ropes rated for that purpose.

I have used a tag line when canyoning with a biner block to abseil the single line, and figure this would be the way to go when abseiling with two ropes of different diameter, so you abseil on the 10.5 and pull the 8mm double as a tag line. Or would a well tied and stoppered overhand be sufficent?