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Topic Date User
Multi Rope Rapelling Question 28-Feb-2013 At 12:53:10 PM Olbert
Message
As I understand it you would like to do a single 80m abseil using two 50 metre ropes tied together.

There are a couple of reasons why you would not do this:

1. When you get to the point where you have to pass 'the knot' (though in this case it's two knots and a couple of lockers) you have a greater distance which you have to skip over which will make it harder and possibly dodgier. In passing a knot on abseil you have to stop above the 'knot', sit on a prussic, undo your abseil device, re-do your abseil device below the 'knot', then unweight your prussic and re-weight your abseil device (normally done with another prussic below). If the clean bit of rope on the other side of the knot is too far down this task will be very difficult and will involve some dodgyness. Even if it isn't a long enough distance to necesitate dodgyness it will definitely make the process harder.

2. You are adding in more links to the chain which can go wrong when there is no reason to. The traditional way of joining two ropes involves one knot - one point of failure. Your suggested way involved two knots and with a double locking biner connection - three points of failure. Though the increase in danger is not much, it is generally a bad policy to increase danger for no benifit.

I would suggest that you tie the ropes together using a double fishermans knot. You might be able to use a Euro Death Knot (dont get scared by the name!) as this has some advantages over the double fishermans and is used in normal double rope abseiling but I'm not sure of it's application on joining two ropes for a longer abseil.

Edit:

I am not giving a lesson on how to pass a knot, if you want to learn how to pass a knot there are much better explanations out there. I would recomend (if you haven't already) learning how to and then practicing passing a knot somewhere close to the ground where you can bugger it up and not die.

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