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joining lines for rappel

Original Post
jeb013 · · Portland · Joined Jul 2012 · Points: 10

I know thus has been discussed to death but anyone ever joined a 7.5 dynamic half/twin rope with a 10mm single for rappelling purposes?

If so edk or fishermans?

Mike · · Phoenix · Joined May 2006 · Points: 2,615

IMHO don't use an EDK, the ropes are too drastically different sizes. Use a grapevine (double or triple fishermans), Fig 8 on a bight w/retraced 8, or a sheep bend. HTH.

rging · · Salt Lake City, Ut · Joined Jul 2011 · Points: 210

edk is quicker and has less chance of snagging. I like to tie two back to back with a one foot tail just because.

Ryan Nevius · · Perchtoldsdorf, AT · Joined Dec 2010 · Points: 1,837

I'm not convinced that tying two EDK's makes it any less likely to snag than a fisherman's. Any EDK fear is irrational. See rgold's posts in this thread.

mountainproject.com/v/joini…

bearbreeder · · Unknown Hometown · Joined Mar 2009 · Points: 3,065

Yr fine

DAV 2005

Leave 2 feet of tail, and if yr really worried use 2 EDKs snug

;)

Bill Lawry · · Albuquerque, NM · Joined Apr 2006 · Points: 1,812

Have regularly joined a 6mm with a 10+mm using the EDK. The failure mode is the EDK capsizes towards the tails. 18 inch tails. Tied so the skinny has to roll over the fat to capsize. Lately I also tie a backup knot with skinny tail around the fat tail.

Ryan Nevius · · Perchtoldsdorf, AT · Joined Dec 2010 · Points: 1,837
Bill Lawry wrote:Have regularly joined a 6mm with a 10+mm using the EDK. The failure mode is the EDK capsizes towards the tails. 18 inch tails. Tied so the skinny has to roll over the fat to capsize. Lately I tie backup knot with skinny tail around the fat tail.
Good photos of this in the thread I linked to above.
Bill Lawry · · Albuquerque, NM · Joined Apr 2006 · Points: 1,812

Agreed. Excellent photos in that thread.

David Coley · · UK · Joined Oct 2013 · Points: 70
Ryan Nevius wrote: Good photos of this in the thread I linked to above.
Hi, do you know of any pull test data that compares the two ways of tying it as shown in the photos? And do we know how they tied it in the DAV test?
Thanks.
rgold · · Poughkeepsie, NY · Joined Feb 2008 · Points: 526

I don't know of comparisons. There is this: mountainproject.com/v/edk-d…

20 kN · · Unknown Hometown · Joined Feb 2009 · Points: 1,346
jeb013 wrote:I know thus has been discussed to death
So why bring it up again, as opposed to just using the search box? You are right, this has been covered a million times, and every answer made in this post so far has already been made by someone else in a duplicate thread. But in short, yes you can join dissimilar diameters.
jeb013 · · Portland · Joined Jul 2012 · Points: 10

Tell me how to search using the app. I haven't figured it out yet.

jeb

jeb013 · · Portland · Joined Jul 2012 · Points: 10

I doesn't matter at this point. I'm home and it worked exactly how those that responded with information said it would.

Thanks for your help. ;)

Kyro · · Unknown Hometown · Joined Apr 2013 · Points: 5

How do subject like this get brought up all the time. And pull testing?? Wtf are you rappelling with a cow or something lol

Ryan Nevius · · Perchtoldsdorf, AT · Joined Dec 2010 · Points: 1,837
Kyro wrote:How do subject like this get brought up all the time. And pull testing?? Wtf are you rappelling with a cow or something lol
Based on the average weight of an adult, male steer, it's likely you'd still be fine.
Gunkiemike · · Unknown Hometown · Joined Jul 2009 · Points: 3,492
Kyro wrote:How do subject like this get brought up all the time. And pull testing?? Wtf are you rappelling with a cow or something lol
The image that came to mind when I saw the title of the thread wasn't a cow, but rather a DEAD HORSE.
Tom Caldwell · · Clemson, S.C. · Joined Jun 2009 · Points: 3,623

Two interlocking loops from a figure-8 on each rope.

Nathan Burns · · Atlanta, GA · Joined Aug 2013 · Points: 66

long live the mighty EDK!

john strand · · southern colo · Joined May 2008 · Points: 1,640
TomCaldwell wrote:Two interlocking loops from a figure-8 on each rope.
Yes
Ryan Nevius · · Perchtoldsdorf, AT · Joined Dec 2010 · Points: 1,837
TomCaldwell wrote:Two interlocking loops from a figure-8 on each rope.
The technical term for this would be a Rethreaded Figure 8, or Flemish Bend. It's important to distinguish between this and an "Abnormal" Figure 8 (tied similar to how you'd tie an overhand), which can fail under small loads.
Nathan Burns · · Atlanta, GA · Joined Aug 2013 · Points: 66

The whole EDK failure under small loads thing is bogus, tests have been run and it takes a couple thousand pounds just to make the knot roll... with substantial tails you have nothing to worry about, plus less snag risk

Guideline #1: Don't be a jerk.

General Climbing
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