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Double Fisherman's, or Grapevine, Bend
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Double Fisherman's, or Grapevine Bend, Knot TyingOverlap the two ends. Wrap one end around both ropes two full turns. Then pass this end back through these turns and pull tight. Next pass the other end two full turns around both ropes. Pass this end back through and pull tight. Pull on both ropes to tighten the two knots against each other.
Double Fisherman's, or Grapevine Bend, Details
Structure: The Double Fisherman's, or Grapevine, Bend (ABOK # 294, p 50.) consists of two Strangle Knots (like double overhand knots) each tied round the other standing end. However, because it is created around another line, this structure may not be obvious.
Safety: For load-bearing using modern high modulus ropes such as Spectra, Dyneema or Kevlar/Technora, use a Triple Fisherman's. In each stopper knot the rope is passed around a third time before being threaded back through the loops. The triple, or even quadruple, version is also used by fishermen to join two lengths of fishing line.
Uses: The Double Fisherman's (Grapevine Bend) is the way to join two ends of a line to form a Prusik Loop and is also an excellent and reliable way of joining two climbing ropes. It can be used for a full rope-length abseil; after which it should still be possible to retrieve the rope.
Inspection: The Double Fisherman's (Grapevine Bend) is not complicated. Nevertheless, it can be tied wrongly and then fail. If you tie it and your life depends on it, inspect it carefully. If someone else ties it, inspect it extremely carefully.
Pros: The Double Fisherman's is a well known, reliable, compact knot suitable for use when retrieving an abseil.
Cons: The Double Fisherman can lock up so tightly that it is effectively welded. Although it is regarded as a standard method of joining climbing ropes, the Zeppelin Bend performs the same task but is much easier to undo because it does not jam. The Figure 8 Bend may be bulkier - especially when stopper knots are added for safety. It is however, relatively easy to teach and inspect.
Disclaimer: Any activity that involves ropes is potentially hazardous. Lives may be at risk - possibly your own. Considerable attention and effort have been made to ensure that these descriptions are accurate. However, many critical factors cannot be controlled, including: the choice of materials; the age, size, and condition of ropes; and the accuracy with which these descriptions have been followed. No responsibility is accepted for incidents arising from the use of this material.