Butterfly bend
| Butterfly Bend | |
|---|---|
| File:Alpine Butterfly Bend Final.jpg | |
| Names | Butterfly Bend, Strait bend[1] |
| Category | Bend |
| Related | butterfly loop, Hunter's bend, Zeppelin bend, Ashley's bend |
| Releasing | Non-jamming |
| Caveat | Errors in tying can result in a similar looking but insecure bend |
| Instructions | [1] |
The butterfly bend is a knot used to join the ends of two ropes together. It is the analogous bend form of the butterfly loop,[1] in that it is the butterfly loop with the loop cut.[2] The observation that the butterfly loop is secure enough to isolate a worn or damaged section of rope within the loop indicated that the bend form of the knot would be similarly secure.[3]
History
[edit | edit source]When Phil D. Smith made the first known presentation of the Hunter's bend in 1953 (under the name "rigger's bend"),[4] he described it as a modification to the butterfly bend.[3] While the bend form had been known to mountaineers, nautical rigger Brion Toss brought the knot to a wider audience when he published it in 1975. Unaware of the earlier publication, Toss called the butterfly bend the strait bend after the Strait of Juan de Fuca.[1][5]
Tying
[edit | edit source]The butterfly bend can be tied using a subset of the methods used for tying the loop form by holding the two rope ends together and treating them as if they were a single bight. However, specific methods have been developed for tying the bend form directly, including the one shown below and characterizable using the mnemonic device "A d through a b; 'twixt the two and toward me":
Security
[edit | edit source]A properly tied butterfly bend should be as secure as the equivalent loop form.[1] However, subtle positioning errors during the above shown tying method can result in a similar looking but insecure bend knot.[6]
See also
[edit | edit source]References
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