Here is an interesting set of gear test videos. Not too sure about the scientific content, but interesting to watch anyway. Pay close attention to the \"rack\" test. Note that the kern of the rope snaps, but the mantle holds - always knew it would, but good to see it in action! Other videos in the series are just as interesting.
http://www.youtube.com/watch?v=r86a-DnHrNE&NR=1