Author Topic: How-to make a v-thread video  (Read 3282 times)

Offline Admin Al

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Re: How-to make a v-thread video
« Reply #15 on: December 09, 2014, 04:54:17 pm »
I seem to remember Jeff Lowe talking about how vertical alignment of ice screw anchors was better as well. There also was a test and article in the AMGA magazine a couple of years ago that confirmed the idea of using a rebored screw hole. RR,  ThnX for the article link. I think this is the main point to take from it:

Anderson Threads (Vertical V Threads) are stronger than horizontal Abalakovs using a 60x60x60 configuration and made with a long ice screw (22cm). Additionally it was observed that the greater surface area enveloped by the V Thread the stronger it is with the ideal configuration being 60x60x60. I found that trying to do construct an Anderson Thread is more awkward than doing a horizontal Abalakov mainly due to difficulty in visualising the angles in the vertical plane, but maybe practice will make perfect. Alternatively given in testing both configurations were strong enough to hold an abseiling climber you could stick with doing your V threads horizontally if you are challenged by doing them vertically. Whatever method you use it is worth noting that they did get some failures at very low loads so I would suggest you still be in the habit of backing up your V thread (whatever configuration you use) for the first person down.
Al Hospers
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Offline ridgerunner

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Re: How-to make a v-thread video
« Reply #16 on: December 14, 2014, 12:06:33 pm »
Truth. Back it up and send the heaviest climber down first.

Offline Admin Al

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Re: How-to make a v-thread video
« Reply #17 on: December 14, 2014, 03:48:51 pm »
FWIW I've also seen people fish their skinny rope through the thread hole and rap off that. First time was Kevin Mahoney on Goofers.
Al Hospers
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Offline Admin Al

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Re: How-to make a v-thread video
« Reply #18 on: December 14, 2014, 03:49:12 pm »
Truth. Back it up and send the heaviest climber down first.

+++
Al Hospers
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my music
 http://www.soundsclever.com