The double fisherman's knot or grapevine knot is a bend. This knot and the triple fisherman's knot are the variations used most often in

climbing Climbing is the activity of using one's hands, feet, or other parts 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 for locom ...

arboriculture Arboriculture (, from ) 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 env ...

, 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 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 (a knot for joining two lines) with a symmetrical structure. The fisherman's knot is also known as: angler's knot, English knot, halibut knot, waterman's knot, and true lover's knot. Properties The bend consist ...

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

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

Drop form

File:Doppelter Spierenstich Tropfen-1.jpg, File:Doppelter Spierenstich Tropfen-2.jpg, File:Doppelter Spierenstich Tropfen-3.jpg, File: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 typically between 2 and 6 million amu. The l ...

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