AncientCraftwork wrote on Mar 18
th, 2020 at 3:30pm:
You'd have to braid extremely tight not to get any elasticity in natural braided cords, though
elasticity is a physical property of the fiber , plant fibers generally are not elastic, animal fibers generally are , synthetic fibers can be both. I am not talking about braid tightness
Morphy wrote on Mar 18
th, 2020 at 4:45pm:
I use to be worried about paracord stretching, but it’s rated at 550lbs so the force exerted on those two cords during the throw is very small and the stretch probably is as well. I’ve never noticed stretch on my paracord slings but I suppose it’s possible.
I believe there will be, it's rated 550lbs but it gets minimum elongation 30% , 10% elongation is enough to ruin the throw. compared to linen and UHMWPE which get ~3.5% at break
we can do a static experiment where we hang from the sling 10-20 kg and measure elongation but unless the result is a big elongation we cannot know the result in slinging. Or we can do a dynamic experiment and use two materials linen vs paracord or dyneema vs paracord on a trebuchet and compare ranges while making sure there is no change in the release angle.
I bought paracord from ebay and also had a friend bring me some from the army , at first glance there is no difference but there is clear difference in the core yarns, army's look A+ quality.