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
See also
*List of bend knots
A list is a set of discrete items of information collected and set forth in some format for utility, entertainment, or other purposes. A list may be memorialized in any number of ways, including existing only in the mind of the list-maker, but ...
*List of knots
This list of knots includes many alternative names for common knots and lashings. Knot names have evolved over time, and there are many conflicting or confusing naming issues. The overhand knot, for example, is also known as the thumb knot. The ...
References
External links
Double Fisherman's Knot
on netknots.com.
{{Knots
Climbing knots
Double knots