trogman wrote:Anonymous_Coward wrote:
I do not agree that a (normal non-equalizing) double figure eight knot would fail in the event of one anchor failure. If that was true, then the whole operation of setting two bolts and using this double loop knot would be for no reason.
Not entirely for no reason. Yes, part of the reason for two bolts is so that in case one fails, you will have a second one. The other (and in my mind, the more important) reason is that it distributes the load, so that each anchor is supporting <100% of the load. This makes it less likely that either anchor will fail in the first place.
Trogman
It wouldn't be the first time a time-honored operation was shown to be pointless...
I don't know much about the knot in question, but if you feel the need to distribute a load between two anchors, doesn't that imply that one or both anchors are potentially inadequate? And if one or both of the anchors are potentially inadequate then rigging them with a knot that fails when an anchor fails wouldn't (as Andy says) make any sense.