A small crew in Europe went out to test ice screws and v-threads The following video is one of those "breaking gear" type videos that we occasionally post. This one is well worth watching.
I was surprised to learn that the v-threads that they placed were weaker than the screws. I had always thought that a v-thread was stronger because it involved more surface area. This series of tests found that screws and v-threads fail in a similar way, but that screws were ultimately stronger.
--Jason D. Martin
Friday, December 6, 2013
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It is an interesting video and reinforces the importance of proper placement in quality ice. The only issue with the method of testing is the slow pull of using a hydraulic ram. The v-thread was also tested in a horizontal fashion where other tests have shown vertical placement being stronger, especially when webbing is used.
After reading tests and videos like this I trust ice protection more than when I started and was instructed to place screws in an upward fashion and 'don't fall'.
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