Originally Posted by glenn
Nope it's an appropriate directional 8. What you are calling a directional 8 is just an 8 on a bight. Maybe the naming of these knots leaves something to be desired but it's a correct directional 8. Here is a video detail the use and misuse of the directional 8.
I'm not sure I would leave this knot on any line.
Hmmm...yep that could be right...it's really tough for me to tell which strand goes where in the original photo.
I'm not sure I "called" anything a directional 8? I definantly know what an 8 on a bight is. If it was a directional overhand...1 more twist(for lack of a better term) would turn it into a directional 8.
The only problem i see with leaving it in the line is knowledge. The directional figure 8 is an advanced knot that works very well for it's intended purpose....pulling hard 1 way. It does not work well for other applications.
If you are looking for a more multi-purpose knot to do basically the same thing tie the aforementioned figure 8 on a bight....it's alittle weaker when pulled along the axis of the rope...but you would have to generate ALOT of force to have it be a problem.
I prefer the multidirectional and strong "Alpine butterfly" AKA "Austrian grapevine" or just the "Butterfly". Look that one up it's a great knot for alot of different applications.
Also...earlier someone mentioned using the directional figure 8 in place of a prussic for a Zdrag. While this would work in some applications, it far from ideal. The benefit of using a prussic is that it can be moved, quickly and easily. That way if you need to reset your pull...further down the line... it can be done very quickly. With the directional 8 you'd have to retie it to reset it.