Mirrored double Butterfly

[agent_smith]

I noted the similar appearance of a mirrored double Butterfly compared to a midline (TIB) Riggers bend.

Refer to image below…

I find these structures interesting - and challenging to tie.

It compels one to think about the definition of a Butterfly - what are the geometric features that make a particular knot a ‘Butterfly’.

Note 1: Some content creators refer to a mirrored double Butterfly as a “counter-directional double alpine Butterfly”.

Note 2: With regard to the use of the word ‘bend’ - in this case it is a likeness to a ‘bend’, not a real ‘bend’ (a pseudo bend).

There is also a midline (TIB) Zeppelin bend (another pseudo bend) - which had been presented some time ago by myself.

Use case: The ‘Mirrored double Butterfly’ has application in high lines used in vertical rescues. In a through-loading profile, it is resistant to jamming. Eye loading would have to be heavy to trigger any potential jamming.

[Dennis_Pence]

I agree that these are hard to tie. It seems like it is easier to start with a Rigger’s Bend tied with two bights. Then I untie it a bit and locate where the two ends are connected in the pseudo bend (shaded region).

I think that I have the mirror image of your Midline (TIB) Pseudo Rigger’s Bend which gives mirrored loops.

When tightened, this looks like the Mirrored Double Butterfly originally proposed by Oleg Volsky (which he called a Counter Directional Double Alpine Butterfly Knot). But if both are loose, they seem less similar.

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