When connected to the Bowline-on-the-Bight with a cowstail attached to the single loop formed by the pitch rope we were able to generate failures in knots that were tied and dressed correctly that had been hand tightened or on occasion body weight tightened. Below are a pair of images showing slip through the knot. Note the blue mark.
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Conclusions: The Bowline-on-the-Bight can fail when you are clipped into a single loop and the knot is dressed correctly and tightened. The failures we generated included ones where we both agreed that we had tied a perfectly acceptable BotB before testing. * normal use if you only use one loop to attach your cowstails as is against the best advice – always clip through both loops! Neither of us expected to see this result and it is frankly odd that no accident of reports of this failure have occurred. Surely people must have clipped to one loop, unaware of the potential risk? |
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