Yes barrel is fair i mention it because the double overhand is the standard finish for thousands of climbers using a bowline. Your eight, that is not an eight but stays unknotted is much more slick.
There is another knot that seems as sturdy and TIB, looks like an eight but isn’t, tail seems to go into the nipping loop a third time, but doesn’t.
In the 1st picture on the left is your unknotted eight as i read it, onthe right the other, that is actually off the scott’s lock variation topic when looked closely.
The tail wrapping around the outgoing leg is a weakness or as an advantage for security?
How does it compare to the similar knot shown in the second pic?
And you have read it very well, that’s the one i was refering to, (i usually am no good at providing worded tying instructions). :o
However, i do not make out any vulnerability at this three rope diameter instance, that might initiate tail slippage, or some other security hole at cyclic loading or slack shaking loading impulses.
Note that Scott’s locked bowline, also uses an unknotted collar component, but as far as i know, it has been characterised as inherently secure.
With respect to your first image, rightmost, TIB variation, it looks legitimate too, it also uses three rope diameter inside the nipping loop(?), of an overhand based collar stabilizer, which, IMO, is not alleged to introduce any tail slickness.
It looks like you are advancing two schools of thought here, with respect to bowline development ;).
I do not see the tail wrapping around the out-going eye leg as a weakness (first image approach), because if i did, i would had devalued many of the inherently secure bowlines, that are used in the field, without reported failures so far.
In fact, i myself, have used this technique, at many of my very own creations.
Yet still, i think i am going to lean towards your second image approach, which exploits the so called Janus mechanism.
In my view, the second collar formation around the on going eye leg, expands the bowline collar function, providing me two bights with their legs nipped that i can handle after heavy loading, along with the apropriate nip constriction, in order to reach the security standards.
Very good, i sense you’re going to feed this forum with a whole lot of fresh TIB bowlines ;).
In the first picture you see two ways to dress this knot. You could not dress the tail outside of the nipping loop of scott’s locked bowline, so it’s more truly inside the nipping loop in a sense
Sure enough the search function does not help to get a clue of what janus mechanism is..
Could someone give a hint or explain please
You’re well aware that this kind of prediction has self-fulfilling mechanics… )
Second picture knot is inspired by your unknotted eight tail finish
Third still resembles a scott’s lock finish vaguely, But it is much more sturdy, clamping the nipping loop from all sides. Tail unknotted as well and just as TIB as second picture knot. It seems to open easy, might jam at higher loads?!
I found both to be unusually sturdy after drawn tight.
i mention it because the double overhand is the standard finish for thousands of climbers using a bowline. Your eight, that is not an eight but stays unknotted is much more slick.