Butterfly bend loop

All three words. "Butterfly Bend Loop", are required to distinguish this knot from the Butterfly Loop. The Butterfly Bend Loop is a fixed loop made in the end of a cord  by tying the working end into the standing part with a Butterfly Bend,  while the Butterfly Loop, common as a loop on the bight, is sometimes made to serve as an end loop simply by tying it near the end of the cord.   The way of making the Butterfly Bend here is almost identical to that of method 4 of  The Butterfly Bend, differring only in that the working end of the single rope here plays the role of the second rope there.

A method for tying the Butterfly Loop as an end loop through a mounted ring may be seen here.  Although the method shown there requires access to the end of the cord, the resulting loop structure is identical to that of the Butterfly Loop as it is tied on the bight.  In the final structure, the working end and the standing part play the same role that the two standing parts play when the loop is tied on the bight, and both legs of the loop play the same role in the structure as they do in the Butterfly Loop tied on the bight.  In the Butterfly Bend Loop, in contrast, the standing part corresponds to one of the standing parts of the Butterfly Loop on the bight, the working end corresponds to one of the legs of the loop in the Butterfly Loop on the bight, and one of the legs of the loop corresponds to the other standing part in the Butterfly Loop on the bight.

For ease of final dressing, it is important to keep the second overhand loop as much as possible distinctly above the first, binding as little of the structure of the first overhand loop as possible, as shown in photos three and four and five. This precaution is very important for stiff rope, and is not very important for flexible rope.

I was hoping that the  Butterfly Bend Loop and the Butterfly Loop loaded as an end loop would have significantly different jamming characteristics when I tested them  in thin stretchy braided nylon cord with a load that stretches the cord by about 25%.   Specifically, I was hoping that loading the part that is the other standing part in the Butterfly Loop, rather than letting it laze about as the working end, would reduce the tendency to jam.  Well, it does, but not as much as I'd hoped.   The difference a noticable, however. If you like the Butterfly Bend enough to learn to tie it as an end loop, I recomend this way of tying the end loop.

By comparison, the Carrick Loop is always extremely easy to untie after the same test procedure.

Both the Butterfly Loop loaded as an end loop and this Butterfly Bend Loop showed no tendency to slip or collapse in my testing.

Alpine-butterfly-bend-loop-01.jpg Alpine-butterfly-bend-loop-02.jpg Alpine-butterfly-bend-loop-03.jpg Alpine-butterfly-bend-loop-04.jpg Alpine-butterfly-bend-loop-05.jpg Alpine-butterfly-bend-loop-06.jpg

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