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knubs
Mar 13, 2012, 12:55 AM
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if i were to tie a loop in a bite of webbing with an overhand knot would the overhand knot be safe? say i had a top rope anchor setup and i have a cam set about 10 feet back from the master point, can i use that tied loop at one end of the webbing to clip into the biner on the cam? then use another loop at the other end tied with an overhand knot to clip into the master point (tensioned and equal with the other anchors of course)? i dont regularly have a cam 10' back, but some times it's how it has be, or i am just adding in redundancy. also, would a figure 8 be better? i know it doesnt look very pretty with webbing.
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USnavy
Mar 13, 2012, 1:17 AM
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You dont need to tie a figure eight in webbing, its unnecessary. Yes you can use an overhand knot in webbing to create a loop, its extremely common actually. But this assumes you are asking about tying a overhand knot in the end of a piece of webbing to create a loop to clip into and not an EDK knot. Do not tie an EDK in webbing (Google the term if need be).
(This post was edited by USnavy on Mar 13, 2012, 1:19 AM)
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sungam
Mar 13, 2012, 12:00 PM
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an EDK (flat overhand, both tails leaving next to each other) is bad, a flat 8 is worse. Use a water knot - they are the generally accepted knot to use when making a loop of webbing.
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dynosore
Mar 13, 2012, 12:32 PM
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knubs wrote: if i were to tie a loop in a bite of webbing with an overhand knot would the overhand knot be safe? say i had a top rope anchor setup and i have a cam set about 10 feet back from the master point, can i use that tied loop at one end of the webbing to clip into the biner on the cam? then use another loop at the other end tied with an overhand knot to clip into the master point (tensioned and equal with the other anchors of course)? i dont regularly have a cam 10' back, but some times it's how it has be, or i am just adding in redundancy. also, would a figure 8 be better? i know it doesnt look very pretty with webbing. Where does tying a knot on a bight come into play here? You're talking about tying a loop in each end of a length of webbing to make one leg of an anchor, right?
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bill413
Mar 13, 2012, 12:37 PM
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I read the description as tying a loop in each end, with a single strand of webbing running between the two loops (like a dogbone); not as a continuous loop.
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sungam
Mar 13, 2012, 2:04 PM
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bill413 wrote: I read the description as tying a loop in each end, with a single strand of webbing running between the two loops (like a dogbone); not as a continuous loop. Huh, that's not how I read it. Makes sense though.
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bigredscowboy
Mar 13, 2012, 2:58 PM
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(editIn reply to: I read the description as tying a loop in each end, with a single strand of webbing running between the two loops (like a dogbone); not as a continuous loop. (/edit) +1, I would never tie a water knot at the end of a single strand of webbing (sungam appears to be thinking of a continuous loop rather than a loop at the end of a stand). A flat overhand at end of a single strand cannot roll like an EDK in a continuous loop. Leave appropriate tail and tie a clean knot; you should never have a problem.
(This post was edited by bigredscowboy on Mar 13, 2012, 3:45 PM)
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moose_droppings
Mar 13, 2012, 3:35 PM
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bigredscowboy wrote: +1, I would never tie a water knot at the end of a single strand of webbing (sungam appears to be thinking of a continuous loop rather than a loop at the end of a stand). A flat overhand at end of a single strand cannot roll like an EDK in a continuous loop. Leave appropriate tail and tie a clean knot; you should never have a problem. The knot will appear like an EDK since both strands will exit the knot on the same side, but since only one strand is being loaded, it wont roll. Like said above leave plenty of tail and check on the tail now and then and it'll be fine. Also remember that this knot will compromise the strength of the webbing by app. 35%.
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csproul
Mar 13, 2012, 3:36 PM
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bigredscowboy wrote: +1, I would never tie a water knot at the end of a single strand of webbing I'm having trouble visualizing this...how would you tie a water knot with one end of webbing? Doesn't a water knot by definition need two ends?
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bigredscowboy
Mar 13, 2012, 3:39 PM
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csproul wrote: bigredscowboy wrote: +1, I would never tie a water knot at the end of a single strand of webbing I'm having trouble visualizing this...how would you tie a water knot with one end of webbing? Doesn't a water knot by definition need two ends? I envisioned a newbie tying a loose overhand a couple feet back and then using the end to complete a "water knot" so that the ends are not pointing in the same direction like the EDK.... just noting that this is not what sungam meant and never a good idea
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csproul
Mar 13, 2012, 3:48 PM
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bigredscowboy wrote: csproul wrote: bigredscowboy wrote: +1, I would never tie a water knot at the end of a single strand of webbing I'm having trouble visualizing this...how would you tie a water knot with one end of webbing? Doesn't a water knot by definition need two ends? I envisioned a newbie tying a loose overhand a couple feet back and then using the end to complete a "water knot" so that the ends are not pointing in the same direction like the EDK.... just noting that this is not what sungam meant and never a good idea Sorry, I still don't get it. If you re-thread a overhand knot with the same end of webbing, I think there is only one way you can do it and still get a loop in the webbing, right? It either ends up essentially looking like an overhand on a bight slash sort-of-an EDK or you don't get a loop at all, right? Maybe I just can't visualize it.
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bigredscowboy
Mar 13, 2012, 3:58 PM
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picture is worth a thousand words.... OP: bueno misreading of sungam's original post: no bueno
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edge
Mar 13, 2012, 3:59 PM
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csproul wrote: bigredscowboy wrote: csproul wrote: bigredscowboy wrote: +1, I would never tie a water knot at the end of a single strand of webbing I'm having trouble visualizing this...how would you tie a water knot with one end of webbing? Doesn't a water knot by definition need two ends? I envisioned a newbie tying a loose overhand a couple feet back and then using the end to complete a "water knot" so that the ends are not pointing in the same direction like the EDK.... just noting that this is not what sungam meant and never a good idea Sorry, I still don't get it. If you re-thread a overhand knot with the same end of webbing, I think there is only one way you can do it and still get a loop in the webbing, right? It either ends up essentially looking like an overhand on a bight slash sort-of-an EDK or you don't get a loop at all, right? Maybe I just can't visualize it. Visualize a water knot with one of the tails being 8 feet long, as opposed to an overhand on a bight.
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csproul
Mar 13, 2012, 4:04 PM
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gotcha, thanks. I really should keep some webbing at work!
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JimTitt
Mar 13, 2012, 4:37 PM
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A bowline on the bight is stronger and you can undo it later.
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bearbreeder
Mar 13, 2012, 5:58 PM
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if yr going to undue it later fig 9 ... pretty, pftttt ... the most important thing is that it does what you need it to do
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knubs
Mar 14, 2012, 6:09 AM
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bigredscowboy wrote: picture is worth a thousand words.... OP: bueno [image]http://im1.shutterfly.com/media/47a2dd32b3127cceffcfd937262400000030O10AaNnLRmzcsmIPbz4K/cC/f%3D0/ps%3D50/r%3D1/rx%3D550/ry%3D400/[/image] misreading of sungam's original post: no bueno [image]http://im1.shutterfly.com/media/47a2dd32b3127cceffcf68cb661800000030O10AaNnLRmzcsmIPbz4K/cC/f%3D0/ps%3D50/r%3D1/rx%3D720/ry%3D480/[/image] there it is thank you!!!!!! i looked for a picture for quite a while and couldnt find one (i see pics like that everywhere but of course i cant find one when im looking...) the first picture is EXACTLY what i was referring to.
JimTitt wrote: A bowline on the bight is stronger and you can undo it later. wow.... i feel foolish for never thinking about a bowline. is this definitely safe in webbing?
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JimTitt
Mar 14, 2012, 7:24 AM
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The bowline on a bight certainly is safe, we use it as the end knot to form a loop for testing single strands of Dyneema/Spectra for various things and it is the knot the German Alpine Club recommend for tying an end loop in slings for belay situations. I wouldnŽt use a single bowline though as IŽve never tested one. Jim
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Rmsyll2
Mar 15, 2012, 5:13 AM
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"the first picture is EXACTLY what i was referring to." Note that the knot is very neat, which for webbing is an issue of limiting the reduction of strength that any knot causes. It has nothing to do with "pretty", it would be a matter of folds and scrunches: the least, the better. Another issue is untying it after full loading. Neat helps there too. .
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knudenoggin
Mar 20, 2012, 12:05 AM
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JimTitt wrote: A bowline on the bight is stronger and you can undo it later. Where can one find dat[a] about this? [edit : "data" ] Note that there are 4 possible *knots* here : the one shown in the photo below for the overhand eyeknot, same one but with the tail loaded, instead --the thought here would be that the tail (as shown) would have protective padding of its twin part against the compression of the eye-legs turn--, and similar variation in the bowline on a bight (where there is less compressing against the loaded part, so having it *exterior* to its twin might be better). !? Thanks, *kN*
(This post was edited by knudenoggin on Mar 20, 2012, 8:21 PM)
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JimTitt
Mar 20, 2012, 11:27 AM
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knudenoggin wrote: JimTitt wrote: A bowline on the bight is stronger and you can undo it later. Where can one find date about this? Note that there are 4 possible *knots* here : the one shown in the photo below for the overhand eyeknot, same one but with the tail loaded, instead --the thought here would be that the tail (as shown) would have protective padding of its twin part against the compression of the eye-legs turn--, and similar variation in the bowline on a bight (where there is less compressing against the loaded part, so having it *exterior* to its twin might be better). !? Thanks, *kN* Well, if anyone can understand that post they have my admiration! When I test a piece of tape with a bowline on a bight at one end and an overhand on a bight on the other the overhand breaks first. That I can still easily untie the bowline afterwards is nice as well. Jim
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knudenoggin
Mar 20, 2012, 8:38 PM
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JimTitt wrote: knudenoggin wrote: JimTitt wrote: A bowline on the bight is stronger and you can undo it later. Where can one find datA about this? Note that there are 4 possible *knots* here : the one shown in the photo below for the overhand eyeknot, same one but with the tail loaded, instead --the thought here would be that the tail (as shown) would have protective padding of its twin part against the compression of the eye-legs turn--, and similar variation in the bowline on a bight (where there is less compressing against the loaded part, so having it *exterior* to its twin might be better). !? Thanks, *kN* Well, if anyone can understand that post they have my admiration! Thanks for that, then. Look, there are two "ends" going into either of the eyeknots in question (naturally, as they might both be tied "in the bight"), and my point is simply that it might matter which of those ends takes the load. In the overhand loopknot shown (upper of two, in blue) above, the visible end lies "interior" to its twin end, which twin is presumably loaded, here. That loaded twin part will bear into its twin around the knot, but at the point of entry it is what gets tightly compressed by the turn of the eyelegs (the opposing parts). In contrast, were the here-shown "tail" loaded instead, at the point of entry it would have its twin part between it and the constricting turn, possibly ameliorating the cutting effect of that compression. (As we saw in some images from Aric --now lonGone--, tears came at this point, and in one case, at the center of the knot, in an eye-2-end knot.) Now, a similar "on top" ("exterior") or "underneath" ("interior") relation occurs with the two ends going into a bowline on a bight, if tied neatly (which might be tougher to do, with the more-squarish HMPE narrow/thick tapes!). But in this case, the entry point should have much less force at any point of compression; thus, an advantage might obtain for loading the twin that wraps around the other. The same knots tied in rope have different geometries, as the round cross-sectional materials don't stay atop one another for any span other than crossing over. But similar questions can be asked about what difference loading one or the other will make.
In reply to: When I test a piece of tape with a bowline on a bight at one end and an overhand on a bight on the other the overhand breaks first. That I can still easily untie the bowline afterwards is nice as well. Jim That's good to know (but it leaves unknown the exact geometry of this --the Which end, or How dressed? question). Now, why the bowline on a bight vs. mere bowline ? One could reeve the latter's tail back through the central nipping loop for added bulk, there, should that make a difference in strength; it also adds some security. Thanks, *kN*
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JimTitt
Mar 21, 2012, 7:40 AM
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Why a bowline on a bight not a normal bowline? Because the OP specifically asked "if i were to tie a loop in a bite(sic) of webbing". It doesnŽt need a stopper knot and is probably stronger as well. As to which strand is loaded, which way it is dressed etc:- This may be of some theoretical interest to knot freaks (and is always included in those climbing instructional books one can buy) BUT halfway up a mountain , in the dark and a snowstorm is practically of little importance. A knot has to perform in any condition, crossed and twisted strands, slack, kinked and all the rest and one should use these strength values to cover the worst-case scenario which is a guiding principle of climbing safety.
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knudenoggin
Mar 21, 2012, 3:03 PM
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JimTitt wrote: Why a []ibowline on a bight not a normal bowline? Because the OP specifically asked "if i were to tie a loop in a bite(sic) of webbing". It doesnŽt need a stopper knot and is probably stronger as well. Oh, my Why...? was to your own (prior) use & testing of just this knot, and why you "never tested one". Since for the controlled use of "testing single strands of [HMPE] for various things" you might save some material, unconcerned about the loosening of an idle knot. Maybe it was a quick case of finding that a bowline slips, in HMPE?
In reply to: As to which strand is loaded, which way it is dressed etc:- This may be of some theoretical interest to knot freaks (and is always included in those climbing instructional books one can buy) Hardly so; it is typically not specified, even where the advice is given to "dress the knot properly". (This omission is esp. obvious when one realizes the disconnect there can be between author & illustrator!)
In reply to: BUT halfway up a mountain , in the dark and a snowstorm is practically of little importance. A knot has to perform in any condition, crossed and twisted strands, slack, kinked and all the rest and one should use these strength values to cover the worst-case scenario which is a guiding principle of climbing safety. This might be expressed as "knots don't fail (in proper materials)". I wouldn't care to put the EDK to such personal testing (the "leave tails long" advice is disquieting, vs. tying it correctly, and with a simple stopper safety). Otherwise, one uses such who-knows knots with the general understanding that ropes are strong, and not with any particular strength values, which are attributable to presumably some particular geometry of the knot, not necessarily the mess described. BUT, one continually reads assertions & recommendations made about knots based on some believed/reported "strength". As if ... ! *kN*
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JimTitt
Mar 21, 2012, 5:17 PM
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Err, well I started using a bowline on a bight for testing other things in Dyneema because the slings came sewn in a loop making a normal bowline somewhat awkward, at least until IŽd broken the tape!
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