Polypropylene Rope

Rope stretch can be used for additional pulling force if played right, and enough return. The return will be less frictions of expansion and compression, hysterics(non immediate 'recoil') and permanent extension damage(the elastic quality is the more tempermental/ delicate quality in life of line); only reaping the benefits of the elastic/immediately recoverable stretching of line in your pull; but that is most of it. If you keep pulling quickly as tree moves forward or truck is coming out of a ditch whatever; you can treat the rope stretch as force storage and not loss. So then you get your pull + rope 'recoiling' at once as greater than eiether single event. This is less fun with block and tackle's already extended tavel for power(both strategies just giving extra distance for power trade; if you can harvest the output correctly); but is an available strategy; working especially well with pulling stuck truck out etc. If you keep pulling confidentally, and not just let the rope memory work alone.

i think the rope stretch with the PolyPro is closer to nylon component of our lines; polyester component is not very dynamic, and adding these other fibers would give some more dynamic to polyester. i'd think with our frictions in use; that would give problems, especially on exterior polypro strands. On the flip side the use for cabling is partially because of lower cold creep factor i believe.
 
Poly props fine IMO for tree work ive had 30tonne excavators struggle pulling backleaners and the ropes were fine,i only have it in big diameter hauling type rope.
 
Drouintree, you make a good point. BUT, remember that lighter, cheaper ropes would have done the same job, and they wouldn't have taken up as much space in your gear box when you do it.

Dull chainsaws work, too...but there's a better way.

love
nick
 
One thing that will keep me using big diameter poly ropes for hanging limbs is the brainstrust on the ground dont have to be too clued up on there wraps one wrap around a decent trunk trunk will hold ALOT using big rope.and no need to set unnecasary tools like portys.

Big hits save time.
 
That and easier on their hands/or other things contacted with bigger footprint; especially a big man's you are usually using for tensioning lines etc. are positive factors for larger size ropes. Usually that accompanies greater tensile which gives better SWL; but at the same time also it's reciprocal Elasticity per inch of line in system decreases.

Jumping to polyPro can give the larger size and offer elasticity that another 'real' rope might not (because it's tensile would be so high as to not yield as much elastic dampening to dynamic forces). But; i'm still not a PolyPro fan for our rigging purposes. i'd rather carry less weight leg guys on ground walk further around tree instead; or use metal friction device; instead of wooden.
 
I hope that my posts in this (and other) threads help to raise some folks'
vision to see that the term "poly / polypropylene rope" can denote a lot
of different things. The quality of even plain PP rope has a range, with
some having decent UV resistance by use of stabilizers & pigmentation
(e.g., I've some 5/16" beachcombed rope outside which shows no signs
of UV degradation, over years of continuous exposure).

Coextruded polyolefin ("copolymer"/"bipolymer") fibres are promoted for
making signficantly stronger (previously quoted one spec), more abrasion
& UV resistant, and less stretchy. PP or coex. fibers are also incorporated
with polyester outer fibers (and otherwise) to give different handling or
surface qualities.

And in the case of laid ropes, there is often a choice of lay--soft (for strength
and also easy tucking-into), med., hard (less flexible, more give, and harder
wearing).

The commercial marine & fishing industries use huge quantities of rope,
much of which has some form of PP in it. Some of this might be appropriate
for arborist uses, some not. But it's certainly not all "cheap PP" which can't
do work. And they use the stuff by the mile (possibly joining 4 1,200' spools
into one "trawl" groundline for lobster pots, e.g.).

*kN*
 
I can remember using poly prop bull for snatching, you think you got all the slack out and they stretch about a meter when loaded..had some worrying moments over roofs when i thought it would not be possible for rope to stretch that much...takes the shock off the tree though wich might of been a good thing.
 
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