tarafrost
Well-Known Member
What is the recommended short bridge option for the JX3 for SRT ascents?
JX3 have a pre-made one, but having both that and the long one attached seems like it would be awkward and/or cluttered.
Anyone had luck with an Amsteel adjustable Utilibridge instead of the stock/short JX3 bridges? I've seen some comments around that Amsteel isn't recommended for bridges, but it does seem to be a common option with a number of respected saddle companies, like Cruzr, offering an amsteel bridge option.
One concern with an amsteel bridge is that girth hitching it to a bridge loop can reduce strength of the amsteel by up to 50%. Most amsteel bridges have a main line of 1/4", which is rated at 8000 lb (35.6 kn). So half of that is 4000 lbs (17.5 kn), which still seems reasonable. However, if you instead girth hitch the prussic loop, which is typically 3/16" amsteel on a utilibridge (5400 lbs/24kn), the girth hitch could be down to 2700lbs/12kn, which seems borderline life support rating. Note: I'm assuming the main line has a spliced loop and you use that to girth hitch in. Also assuming the prussic is a full bury loop, but that means where the two buried ends meet, you have a single line....and if that spot is in the wrong place (middle of girth hitch) strength could be 1/2 of the single line load. I suppose the easiest way to avoid the strength issue is to girth hitch the main line and use a biner to attach the prussic.
Thoughts anyone?
JX3 have a pre-made one, but having both that and the long one attached seems like it would be awkward and/or cluttered.
Anyone had luck with an Amsteel adjustable Utilibridge instead of the stock/short JX3 bridges? I've seen some comments around that Amsteel isn't recommended for bridges, but it does seem to be a common option with a number of respected saddle companies, like Cruzr, offering an amsteel bridge option.
One concern with an amsteel bridge is that girth hitching it to a bridge loop can reduce strength of the amsteel by up to 50%. Most amsteel bridges have a main line of 1/4", which is rated at 8000 lb (35.6 kn). So half of that is 4000 lbs (17.5 kn), which still seems reasonable. However, if you instead girth hitch the prussic loop, which is typically 3/16" amsteel on a utilibridge (5400 lbs/24kn), the girth hitch could be down to 2700lbs/12kn, which seems borderline life support rating. Note: I'm assuming the main line has a spliced loop and you use that to girth hitch in. Also assuming the prussic is a full bury loop, but that means where the two buried ends meet, you have a single line....and if that spot is in the wrong place (middle of girth hitch) strength could be 1/2 of the single line load. I suppose the easiest way to avoid the strength issue is to girth hitch the main line and use a biner to attach the prussic.
Thoughts anyone?
