The double fisherman's knot or grapevine knot is a bend. This knot and the

triple fisherman's knot The triple fisherman's knot is a bend knot, used to join two ends of rope together. It is an extension of the double fisherman's knot and is recommended for tying slippery, stiff ultra-high-molecular-weight polyethylene (UHMWPE) and aramid core ...

are the variations used most often in

climbing Climbing is the activity of using one's hands, feet, or any other part of the body to ascend a steep topographical object that can range from the world's tallest mountains (e.g. the eight thousanders), to small boulders. Climbing is done fo ...

arboriculture Arboriculture () is the cultivation, management, and study of individual trees, shrubs, vines, and other perennial woody plants. The science of arboriculture studies how these plants grow and respond to cultural practices and to their environmen ...

, and

search and rescue Search and rescue (SAR) is the search for and provision of aid to people who are in distress or imminent danger. The general field of search and rescue includes many specialty sub-fields, typically determined by the type of terrain the search ...

. The knot is formed by tying a

double overhand knot The double overhand knot or barrel knot is simply an extension of the regular overhand knot, made with one additional pass. The result is slightly larger and more difficult to untie. It forms the first part of the surgeon's knot and both sides ...

, in its

strangle knot The strangle knot is a simple binding knot. Similar to the constrictor knot, it also features an overhand knot under a riding turn. A visible difference is that the ends emerge at the outside edges, rather than between the turns as for a constr ...

form, with each end around the opposite line's standing part.

Usage

A primary use of this knot is to form high strength (round) slings of cord for connecting pieces of a climber's protection system.

Other uses

This knot, along with the basic

fisherman's knot The fisherman's knot is a bend (knot), bend (a knot for joining two lines) with a symmetrical structure consisting of two overhand knots, each tied around the standing part of the other. Other names for the fisherman's knot include: angler's knot ...

can be used to join the ends of a necklace cord. The two strangle knots are left separated, and in this way the length of the necklace can be adjusted without breaking or untying the strand.

Tying

Line form

Image:Doppelter Spierenstich-1.jpg, Image:Doppelter Spierenstich-2.jpg, Image:Doppelter Spierenstich-3.jpg, Image:Doppelter Spierenstich-4.jpg,

Drop form

Image:Doppelter Spierenstich Tropfen-1.jpg, Image:Doppelter Spierenstich Tropfen-2.jpg, Image:Doppelter Spierenstich Tropfen-3.jpg, Image:Doppelter Spierenstich Tropfen.jpg,

Security

Dyneema Ultra-high-molecular-weight polyethylene (UHMWPE, UHMW) is a subset of the thermoplastic polyethylene. Also known as high-modulus polyethylene, (HMPE), it has extremely long chains, with a molecular mass usually between 3.5 and 7.5 million amu. T ...

/Spectra's very high lubricity leads to poor knot-holding ability and has led to the recommendation to use the

rather than the traditional double fisherman's knot in 6 mm Dyneema core cord to avoid a particular failure mechanism of the double fisherman's, where first the sheath fails at the knot, then the core slips through.Tom Moyer, Paul Tusting, Chris Harmston,(2000) Comparative Testing of High Strength Cord

References

External links

Double Fisherman's Knot
on netknots.com. {{Knots Climbing knots Double knots