smokey01
ArboristSite Operative
I call it "modified" because it is actually a bowline that becomes a sheetbend, almost, with the exception of the direction of the running end of the tail.
Let me explain how I use this. I have an HTP kernmantle rope that I used to ascend into the tree. Once in the tree I use a double braid Poison Ivy or similar to work around the tree or go to adjacent trees.
So, to get it all where I want them....(both ropes because I'm lazy and don't want to ascend with the other rope attached to my saddle.)
I connect the end of my kernmantle rope to my throw line either using a pile hitch followed by half hitches or a splicing knot followed by half hitches. I pull the line up until it just comes over my TIP. Then I use this knot ("modified" sheetbend) to tie on my Poison Ivy. Now both ropes are headed up and my throw line is coming down. I continue pulling my throw line down until the end of my kernmantle reaches me, (the Poison Ivy has just reached my TIP, but has not been pulled over yet) I tie an Alpine butterfly on the ascending side of my kernmantle, untie my trow line, thread the descending end of the kernmantle into the butterfly and send the butterfly up to the TIP. As the butterfly goes up, the end of my Poison Ivy comes down. As the butterfly reaches the TIP and becomes secure, the end of my poison ivy comes down and is now over the anchor waiting for when I need it.
I ascend the kernmantle, clip in and switch over to my "motion lanyard" Poison Ivy rope or similar and go where I want.
Below is a sheetbend (actually, slippery sheetbend but same thing) but notice the upward direction of the tail.
The picture below that is the same sheetbend that starts to pull apart as the weight of the tail or running end of the rope starts to pull on it. Also it has no chance of getting over my TIP without coming apart.
That is what I perceive as the difference between a true sheetbend and the bowline that becomes a sheetbend. So it is really a sheetbend with the tail exiting in the wrong direction.
unmodified sheetbend
unmodified sheetbend that comes apart with the weight of the running end of rope.
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