General > Practical Knots
Midspan bends.
xarax:
There are six classes of two-line bends: in the case when we have to join two lines, and only the one end of only the one line is accessible, we need a "mid-span" or "mid-line" bend. (The bend should be able to withstand a pull coming out of any end(s) and any direction(s).) A very simple midline bend I can think of is the "midline bowline", shown in the pictures below (in three variations). Of the many alternatives one can think of, which are the most practical ?
roo:
--- Quote from: xarax on April 15, 2011, 02:22:03 PM --- Of the many alternatives one can think of, which are the most practical ?
--- End quote ---
Some that I use often:
http://notableknotindex.webs.com/sailorhitches.html
http://notableknotindex.webs.com/midspan.html
...although the Midspan Sheet Bend can also be made with a minor variation that fits your scenario, such that the U shape is the rope without end-access. This could be modified to a Double Sheet Bend form easily.
xarax:
Thank you roo,
I dont believe that some friction hitch around a straight rope line, any friction hitch, can serve as a reliable bend...(with the possible exception of the ww hitches). We have to anchor our knot to some curved section of the mainline, be it a loop or else, to achieve a sure footing ( take advantage of the vastly greater friction forces along curved segments ).
The midspan sheet bend is a fine bend. In fact, I do not know any other simple bend that can do its job. However, it addresses the problem/case where we do not have any accessible rope end - so it is probably not the optimum solution for a "midline bend" in the sense described in this thread. Also, even in the modification you propose, it remains a sheet bend, which is not a very secure type of bend for slippery ropes, I believe.
roo:
--- Quote from: xarax on April 15, 2011, 09:50:02 PM --- Thank you roo,
I dont believe that some friction hitch around a straight rope line, any friction hitch, can serve as a reliable bend...(with the possible exception of the ww hitches). We have to anchor our knot to some curved section of the mainline, be it a loop or else, to achieve a sure footing ( take advantage of the vastly greater friction forces along curved segments ).
The midspan sheet bend is a fine bend. In fact, I do not know any other simple bend that can do its job. However, it addresses the problem/case where we do not have any accessible rope end - so it is probably not the optimum solution for a "midline bend" in the sense described in this thread. Also, even in the modification you propose, it remains a sheet bend, which is not a very secure type of bend for slippery ropes, I believe.
--- End quote ---
The Sailor's Hitch, when tensioned by the standing part and free end, will often cause the passive rope to contort such that it is no longer straight, depending on size ratios.
If you are looking for a high-security joint in slippery lines, I'd suggest tying a Butterfly Loop first, and then attaching to that loop with a high-security structure, such as the Zeppelin Loop.
xarax:
--- Quote from: roo on April 15, 2011, 10:18:45 PM ---If you are looking for a high-security joint in slippery lines, I'd suggest tying a Butterfly Loop first, and then attaching to that loop with a high-security structure, such as the Zeppelin Loop.
--- End quote ---
We are abandoning the KISS principle in this way, I am afraid...
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