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69/Zeppelin/Rosendahl excellent choice for nonJamming/re-usable Bend. >>Prefer triple-fisherman's for welding into a Prusic , never to be untied again security and profile. >>Olds-cool would go with DOUBLE SheetBend , if mix materials with any smaller OR denser cord being the locking hitch side...

Of course please try knots (DBY, Blake's, stoppers each end) and how they react etc. sitting on couch for hours first. Know your knots and materials before placing life in their hands. Steep, but workable hill is also safer practice than free fall height . >>should know knots REAL well, tend to...

Can say same there as here; materials you are working in. . DBY and Blake's will lend self very well to common olds-cool arbo lines ArboPlex, True Blue, Tree Pro Red, Blue Streak, NE HyVee, even NE 3strand Safety Blue etc. >>1/2" 3strand NE for Blakes on braided 1/2" isn't a bad ride (IMHO)...

i see tight, harder lines trying to bite with cord of 1/2 tension legs cumulatively both pulls equal gripped line. i see force applied to Prusik as unit split into 2x half-loaded equal/opposites to grip full-loaded line together (after loading reduced further by frictions) >>Furthermore, i don't...

YW! . May you say name or show pic of rope 'device' or type of line and cord using in these builds? >> mechanical builds Educated Climber.com Ashley Book of Knots (ABoK) chap_26 pre-Ramble: "But knotting is merely the application of certain mechanical principles, and a principle itself can...

i'm thinking Prussic should be more properly a percentage of host line diameter diff. rather than a set amount. >>i go with 50-75% >> but will try to find real research number. >>i go with model of want a harder lay and smaller diameter to give a harder package that the 2legs are pulled at half...

Should not climb to TiP(Tie in Point) with line draped over support limb to prussic both legs as 1 >>cuz the line spread near top draws open hitch. >>hitch should hold, but when unloaded release with thumb action, then re-grip on command. The 'choked' Bowline wrote about earlier, does afford...

To me, a prussic feeds 2 legs of pull of 1/2 bodyweight each, onto line that is pulled harder by full bodyweight>> thus harder to grip . So prefer the 50-75% diameter prussic cord formulae to give less footprint for harder pressure in that footprint >>and to same theory a harder layed cord...