As in:
Testing has shown that a failure mode exists at very high loads with the double fisherman’s knot in ropes using Spectra and Technora cores. The sheath of the rope separates at the knot and the high lubricity core slips through the double fisherman’s knot. Although the increase in ultimate strength is small, the triple fisherman’s knot does not exhibit this behavior. This has led to the recommendation to use the triple fisherman’s knot in to avoid this particular failure mechanism.

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