Knot names vary, several references for Jacked Bowline.
Double Bowline upgrades the "Nipping Loop"(IGKT) in Bowline construction from a single Turn base to Round Turn (RT on IGKT forum).
If make same RT into CLOVE is 'Water Bowline', because is a sometimes a very needed upgrade in water, grips more tenaciously even in that context.
Take Bitter /Working tail of normal or Double Bowline and 'reeve' it back up along the Standing Part (S_Part on IGKT forum) is a "Yosemite Tie Off" for more security and to 'clean up the eye' as now more resembles an open/clear eye splice to attach to etc.
DBY is Double Bowline with Yosemite tie off, much more symmetrical look and feel, open eye, more secure; discussing how much stronger.
i favored the slip-knot inversion method of making Bowline(can't believe slideshow is 20yrs old!)
>>Instead of the rabbit going up thru the hole, around the tree, the mountain comes to Mohamad!
In olde times if stranded on a side of a cliff, holding on w/1 hand, they could lower a line with the slip knot in 5' or so up.
With one hand person would try to get Working End around themselves under armpits (or seat if real good hanging on), back up thru the Slip Knot and fold back down outside it.
If holds on right , even if falls at this point should invert slip-knot and make FIXED eye around self not shrinking eye on lungs etc.
>>Lesson can pre-make half of Bowline for quicker tying 2nd half if needed, can even hang slip knot eye on hook, even own thumb;
>>visualizing almost needing to capture some strong bull soon as contact, release confidently to rope ..
>>(modern HPME stronger than steel ropes have special needs and rope bend references now all show higher in general ):
Not too stiff like Stable Braid etc. / more like ArbroPlex/True Blue class,
Would assume 50% strength loss on knots etc.
This takes into consideration like Marl, HH (50% 'strength') and
notably a 1/2" rope (x4 diameters)on a 2"pulley as 50% 'strength'
>>approximate 4" pulley(x8 diameters) for 1/2" line about ~100% 'strength.
So, HH/Marl matched to 2" arc in 1/2" line as matched components, chain only as strong as weakest link anyway.
>>bigger branch than 2" more radius/ strength retention, but more frictions deforming line too/strength drop..
Knot 'strengths' over 50% are more 'premium'; and rightly all that we look at using generally in our world.
>>Overhand knot on primary loaded Standing Part at full load a no-no cuz is around 40-45% 'strength' knot deformity
>>Sheet Bend around 50% line, so ok in their working class
>>Bowline i think re-routes some of the load on Working End of primary bend from S_Part
>>so anyway, test out higher than Sheet Bend of similar architecture going into primary loaded deformation, but not out of..
(as i try to visualize what is going on inside knot microcosm)
Still trying to werk animations.
Biggest strength increases in hitches i think:minimal deformity to most fully loaded S_Part, after that , if working end is to deform S_Part: RT around S_part w/minimal previous frictions (or grip mechanic doesn't werk) to more than just bend fully loaded S_Part but then hug it to manage deformity better/ give some strength back. When visualizing rope as power vessel like wire with force running thru it i look at RT on S_Part as upgrade like grommet rather than sharp bend going into tv/knot machinery as just deformity managed better/ more strength retention. Beyond that , offloading some force at or before any deformity, maintaining S_Part pure inline as much as possible , and can make float away from / not have to collapse to host mount, like an eye slice can or a friction hitch in right circumstance. NOT collapsing to host showing Definitively as separate leg of support to load, so less tension on part of primary loaded deformity, for less, strength loss. The 'secondary leg' on these also will pull more inline than across the fully loaded S_Part.
>>i think that and some rope angle ranges are mostly all there is to it!
>>ABOK does note RT on host is stronger on small hosts as evens out wear, but if do this don't get benefits of RT on S_Part that i think is better.
A single, simple Turn around a polished 24" capstan/pipe i'd guess can't hold 500# by self confindentally.
But guess RT on 2" might only take around 50# hold, another turn on 2" host just a few pounds to hold 500#.
>>even though, more surface area contact on the 24" i think, so look at this pinch , grip thru host, even if line as TOTALLY different mechanic than a simple, single Turn.