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thebuffalo


Mar 23, 2007, 12:28 PM
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Double Fisherman backup
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When I was a kid, my grandfather passed down a bunch of (probably unsafe) equipment including a goldline, really old carabiners, and some old BD hexes that were super thick and made out of soft aluminum. They were roped with 7-8mm cord and tied with a double fisherman's knot. They were also backed up by tying another fisherman's knot with the tail ends (to the cord, not each other). I haven't seen it done like this since. Any opinions on whether this is better, unnecessary, or whether my grandfather just had OCD?

V


bobruef


Mar 23, 2007, 1:10 PM
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Re: [thebuffalo] Double Fisherman backup [In reply to]
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I think if one were ocd, a tripple fisherman's would be the way to go.


ja1484


Mar 23, 2007, 1:24 PM
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I know a guy who slings his hexes/bigbros with quad fishermans knots. Whatever works for him. I usually just do a triple fish (I sling with Sterling Powercord - not nylon) and check the knots before each climb.

Seems to work fine.


lostparrot


Mar 23, 2007, 1:55 PM
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Re: [ja1484] Double Fisherman backup [In reply to]
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what about double fish for hexes? doubles back to back lock tight, why bother with trip?


dan2see


Mar 23, 2007, 4:00 PM
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lostparrot wrote:
what about double fish for hexes? doubles back to back lock tight, why bother with trip?
The high-tech cords are more slippery than nylon. When your pro catches your fall, it could slide off. That's a reason to tie a triple fisherman's.

It doesn't matter what type of pro you use: big hex, big nut, or cam -- the knot has to hold.


ja1484


Mar 23, 2007, 6:25 PM
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dan2see wrote:
lostparrot wrote:
what about double fish for hexes? doubles back to back lock tight, why bother with trip?
The high-tech cords are more slippery than nylon. When your pro catches your fall, it could slide off. That's a reason to tie a triple fisherman's.

It doesn't matter what type of pro you use: big hex, big nut, or cam -- the knot has to hold.


Bingo, Sterling says the triple fishermans knot is the appropriate knot to use when securing Powercord, so that's what I use.

Most nylon cords are fine with a double fishermans, but they tend to be bulkier and less abrasion resistant. They have their advantages, and I still use nylon for equalletes and prusik cord, and I use nylon sewn slings, (for obvious reasons), but rarely for slinging pro any more.


COsnowman


Sep 13, 2008, 12:51 AM
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Re: [thebuffalo] Double Fisherman backup [In reply to]
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Just interested in knowing if the double fish knot is the strongest/safest knot for joining two ropes for rappel. I would also like some input into the debunking of micro fractures if metal gear. Any help out there thanks.


binrat


Sep 13, 2008, 11:06 AM
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CO;
The DF knot is strong, but may get caught when you pull it. There are other knots that are equally as strong but don't catch that easy.

binrat


milesenoell


Sep 13, 2008, 12:50 PM
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COsnowman wrote:
Just interested in knowing if the double fish knot is the strongest/safest knot for joining two ropes for rappel. I would also like some input into the debunking of micro fractures if metal gear. Any help out there thanks.


As far as I know, micro-fractures from drops are a real concern in metal gear, but that they tend to come from drops not smacks so you tend to know if you are in jeopardy.

As for 2 rope raps, the Euro Death Knot (aka: double overhand knot) well dressed with big tails is an old standard


acorneau


Sep 15, 2008, 5:31 AM
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COsnowman wrote:
I would also like some input into the debunking of micro fractures if metal gear. Any help out there thanks.

Read here: http://onrope1.com/Myth1.htm


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