In reply to gb83:
Two sections: Quick answers & Variants (knots)
Q U I C K A N S W E R S
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| Another thing to throw in, I tend to belay from the rope loop rather than the belay loop.
| (easier to escape the system if necessary). Is there a problem doing this with a bowline
| in that if you pull on the loop (ie reverse load it) it the 'rabbit' can pull through?
YES!!! This loading is known as "ring loading", and a REGULAR Bowline can spill in a flash (end pulls out).
(The spilled knot is effectively--i.e., as defined by this loading--a opp-side Lapp bend. Potentially, the Fig.8
can also fail in this loading, like the now infamous Offset Fig.8 abseil bend.) --see next:
| Sutty: You tie the bowline so the tail goes on the INSIDE of the loop,
| so if you forget to tie a stopper the end does not get snagged and pull the knot apart.
----
| ... and the direction round the tree is the difference between it slipping or not (before the stopper knots).
MYTH. While, yes, snagging the end of this version of the Bowline can capsize it, by the same token
once that end is released, it's highly likely that the knot will re-tie itself (as it's the very method employed
in the cited link for tying the Edward's Bowline). I doubt that there have been the rumored failures of the
Bowline attributed to this perceived vulnerability (contrary some on-line assertions).
And it is just THIS version of the Bowline that is NOT vulnerable to the ring-loading just discussed,
as the effective knot in that case is a Lapp Bend, which given the then-effective lonnnng end (i.e.,
what had been the main line for the Bowline), should lock off soon enough; the Bowline's end (now
one of the two effected "end"s of the bend) will be instantly nipped.
.:. But we can step past this question by agreeing that EITHER simple Bowline should be eschewed
[gesunheit! :-] in preference to some **secured** version. (See Variants, below.)
| How many serious accidents have occured to experienced climbers due to incorrectly tied bowlines?
We can re-emphasize: use some form of SECURED Bowline.
| JoeMiller: I use a bowline for sailing - on one occasion I had a bowline unravel itself.
| It was under repeated shock load, and the rope diameter seemed to shrink and the knot untied itself.
| For this reason, I would never consider using a bowline.
I'd like to know more of the circumstances (material, use) of that untying--fascinating/edifying!
But the fact doesn't have to bring your conclusion, as one can secure the Bowline.
(Play this game: believe that the old climber knot was a Fig.8-based ganging knot where the end
was rethreaded only to make a u-turn, i.e., about half-way. And then people had bad experiences
and so began rethreading it entirely--i.e., they didn't throw away the Fig.8 base and drop the knot.
Well, look at the basic Bowline as just such a beginning, and don't quit on it.)
| Well, I learned to tie a bowline when I was a 12 year old Boy Scout, and I recall nobody had any difficulties in learning and tying a bowline.
But you weren't tying it in slick, firm, kernmantle ropes, and hanging your lives on it up long climbs.
.:. One needs to beware taking knots from one material domain to another.
| Duncan: An incorrectly (partially) tied figure of 8 is just strong enough ...
... to break a bowline. AMGA has tested such knots and found them to be no weaker. Here, though, we must
note that "incorrectly/partially tied" is ambiguous re exact form (as, for that matter, is "Fig.8" !). Heck, one can
have a secure-under-load Fig.8-based knot with must two tucks & no u-turn.
| A fig-8 is stronger (80 % of rope strength as opposed to 60% for a bowline),
| easier to teach, easier to buddy-check, and easier to tie.
Re strength, one can more practically say: they are equally strong--i.e., neither breaks (so you won't know
any difference). If you want to get technical, well, there are so many issues re how strengths are determined,
and then how the knots are tied (damn near never detailed), that you won't find a good answer. I agree in
general, but there are Bowline variants that will surely be in the same neck o' the woods (ones in which
more diameters of rope pass through the bunny hole turn of the main line).
For some test results contradicting your quotes, cf [url]www.caves.org/section/vertical/nh/50/knotrope.html[/url].
As for teaching, that should be redressed; the Fig.8 tolerates sloppiness, let's leave it at that. Compare some
images and you'll soon see a variety of this "easy to learn, easy to tie, easy to check ... [blah]" knot's variety! The Bowline is MUCH easier to tie and tie quickly.
| Gordon: It's really rather fantastic to imagine anyone doing it any other way.
| Aren't they taught about the rabbit coming out of the hole anymore?
Along with this what needs teaching is the quick-tie method (mostly one
hand moving, the other supporting), which should be done as in the Grog-site's way BUT oriented with the
hand coming FROM UNDER the mainline--the knot is much better seen/understood/recognized by the
presentation of the side where the mainline's initial crossing into the knot is UNDER (the collar)!! --all
of the variations on the Bowline are better seen from THIS side. Unfortunately, the promulgated quick-tie
method and even rabbit-hole-tree one often show the opposite side up. boo!
And "buddy-check"? --educate your buddies! (It's a self-fulfilling prophecy to not learn and then cite ignorance.)
| Lynn Hill ... was distracted and didn't complete her knot
In fact, she didn't BEGIN the/a knot!
Obviously, she had no protocol of someone checking her knot--a dropped
precaution because of her skill at knotting, presumably; but it's not only
the skill that's checked, but the act.
| the fig.8 is easy to see if it's mistied ...
| -------
| If anything, I'm more inclined to get the fig of 8 wrong - if the tieing of the bowline goes wrong I always spot it immediately.
&
| I find when i tie a bowline wrong it all falls apart in my hands!
Yeah. I'd like to see some images of what a mistied bowline (that yet has integrity to exist
as a knot) looks like. There are some, um, *anti-bowlines* where the rabbit's passage in/out
of the whole are different (goes in the opposite side and returns IN that same side); but these
are valid knots, though with their own idiosyncrasies, strengths & weaknesses (and some are
quite nice!). Fig.8s aren't so much easy to check if they're right, but enough tolerant of the various
ways they get tied (dressed) that it doesn't matter which way, so much. (E.g., the photo'd knot
of the BMC Knots booklet is differently dressed than that in the tying diagrams.)
-------- Variants next post ...
*knudeNoggin*