The hitch I have mentioned does include some of the scaffold knot,
but because of the inclusion of the two round turns [i.e., just one more...],
I believe it is a new hitch,
unless exactly the same hitch can be found in literature or reference elsewhere.
Tim, with respect, this is simply silly : adding one
more round turn (i.e., repeating what exists already)
does NOT win you (m)any points for inventiveness!
(You might gain something for presumably realizing
--though possibly in retrospect to trial&error-izing
--
that the "tensionless hitch-ing" aspect needs this further
wrap against so smooth an object (vs. cavers e.g., tying
around the rough bark of a tree).)
My reasoning for the above paragraph is as follows:
The single overhand knot is known as 'The Thumb Knot'.
Add another overhand knot, it becomes a double overhand knot
known as a 'Blood Knot' (ABOK p84. Knots 515 & 516).
''The round turn and two half hitches is named by steel in 1794''.
A totally separate knot mentioned shortly after the first knot states
''Two round turns and two half hitches, so called by Dana in 1841''.
(ABOK p296. Knots 1720 & 1721).
Now you're definitely getting silly!
Firstly, you don't "add another
overhand knot" to get a
dbl.Ohbut add a 2nd tuck (in pretzel form) or --more insightfully/significantly--
a (first!) *wrap* in the
strangle knot form, to do that.
(Doing what you say would be stoppering the initial
overhand.)
I expect I could find more examples of different knot/bends/hitches
which> [that] are made up of parts of some other configuration.
Oh, heck, why go "different" : you can find the SAME knot
getting different
names, if name-glory is what is wanted!
(... noting that e.g. "blood knot" attaches to other things, as well)
But my point is I still think my hitch may be new as I can't find anything exactly like it.
It is also of importance to be recognised as a separate entity
because of the fact it is not a fancy decorative knot,
it is a practical hitch that may have the potential to be used
in constructional tensioning applications in the future.
NO. Rather, it is more important to have an understanding
of knots & their purposes and effects/workings such that one
can readily adjust to particular circumstances by such simple
means as furthering a structure (such as wraps) or adding
a stopper knot or ... . E.g., when Heinz Prohaska presented
his --my name, here-->
ProhGrip friction hitch (aka
"Blake's h."),
he added the commentary that if the hitch can still not hold
so surely in stiff rope, then add a further wrap with the tucked
tail (i.e., a further 2-dia. wrapping); or if the slippage seemed
attributable not to inflexibility buy slickness, add wraps of
the single-diameter end of the structure. I.e., he did NOT
merely introduce the JUST-THIS-#-OF-TURNS knot; he gave
us a good idea of a structure that could be manifest in various
forms!
Given an
overhand, adding a wrap to it to get the
strangle is a significant gain, as the first knot has no
such press-against-the-crossing part; adding further wraps
is just furthering what the first addtion presented, but is not
additionally creative.
(And as far as hitching to something, one must beware
that not all objects will accommodate multiple turns!)
My decision to test which knot/hitch against which knot/hitch came about from
over 35 years of working with ropes at sea both professionally and leisure,
and from rock climbing for leisure. I was also drawn to an online article in
Yachting Monthly (May 2015) which was conducted by Marlow Ropes.
http://www.yachtingmonthly.com/sailing-skills/strongest-sailing-knot-30247
OH, and I just boldly and colorfully thanked Alan for this
--so much for quick scanning ... . <sigh>
I'll go do an edit ... .
And did you read this report carefully, attentively,
eyes open and not kneeling to this apparent *authority*?!
Because there are some eye-opening assertions in this!
(I'll refrain for time and for giving others I hope the chance
to do some critical reading/thinking themselves.)
My pilot tests were as follows.
Bowline v Round turn and two half hitches
- The round turn and two half hitches won outright 4 times out of 4 (as expected, based on work and climbing experience, and also Marlow Rope's online testing).
Looped double fisherman's (Scaffold hitch) v Round turn and two half hitches
- The round turn and two half hitches won outright 4 times out of 4 (as expected, base on work experience and based on Marlow Ropes online testing).
[?? Expected based on Marlow? Why, their (dbl.) scaffold --no RT-- beats RT+2hh]
Round turn and one half of a double fisherman's (Scaffold hitch with a round turn) v Round turn and two half hitches
- The Round turn and one half of a double fisherman's (Scaffold hitch with a round turn) won outright 4 times out of 4 (I did not know what the outcome would be here).
Round turn and one half of a double fisherman's (Scaffold hitch with a round turn) v My hitch Two round turns and one half of a double fisherman's (Scaffold hitch with two round turns)
- My hitch won outright 4 times out of 4 (I definitely was not expecting this outcome).
[Why not : the extra turn can only help, one might think.
(Possibly by enabling more slippage through the tightened knot
--i.e, an extra-turn-of-material's stretch to draw tight out through
the noose's knot-- could make it worse, but ... )]
'English Braids' have very kindly provided me with 200 metres of 4mm 12 stranded polyester dinghy control line to continue my testing.
... The next stage is to test my hitch against the splice under different environmental conditions.
[Again, I urge you test the re-casting of the dbl.oh knot's shape
into that of the anchor bend, its turns going AWAY from the object.]
Based on Marlow Ropes online knot test which the round turn and two half hitches is rated very highly against a splice, I have high hopes for my hitch as it outperformed the round turn and two half hitches by far.
[?? Directly, based on Marlow's finding a like noose so strong, getting their hightest break.]
Tim, consider this, with care :: What is the difference
between the
RT&clove noose and your
dbl.scaffold h. ?!!
THINK, l00k; further think.
Where do the test-reported breaks come?!
(Hint : what knot did I recommend you try --you didn't reply to that?!
Let me ask you to try this, er tie this, "double overhand"
in the form of an anchor bend/fisherman's bend;
)
I look forward to any replies
Tim 
Now, this one's in your rear-view mirror.
--dl*
====
