tag:blogger.com,1999:blog-6940163880772720830.post1632714547593686153..comments2024-03-16T10:11:19.302-07:00Comments on Cold Thistle: The Curious Case of the Commercial Umbilical Strengths?Danehttp://www.blogger.com/profile/08300760603627210620noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-6940163880772720830.post-59684111823515267392011-04-12T09:33:49.465-07:002011-04-12T09:33:49.465-07:00It seems the sling is the weakest link. Did I rea...It seems the sling is the weakest link. Did I read it correctly - sling broke at 800lb (3.6kN)? This makes sense because the webbing is thinner than standard 0.5" milspec - which is quoted as having tensile of 4.5kN according to mec website.<br /><br />This is definitely not strong enough to intentionally hang from, but no matter how you adjust it or what your height is, it does not seem practical to intentionally hang from anyhow - too much extension from the stretch plus harness riding up.<br /><br />However, it would be nice to have some confidence that it will hold an unexpected slip. Has anyone seriously fallen onto one?<br /><br />The 3.6kN sounds decent enough to reliably hold body weight. Bodyweight is only 0.8kN (80kg). The problem though is that it is extremely static, so if you were to cleanly fall onto it from more than a few inches, the static impact is huge and likely to either shear the tool out or break the webbing. A clean 1ft fall onto a static sling can apparently generate close to 10kN impact force.<br /><br />It would be really nice if it could be made more dynamic somehow. I've been experimenting with attaching it to my harness with a screamer aid (1.5kN activation) - but it is a little awkward. Would be even better if a few load limiting stitches could be built directly into it somehow. Anyone have thoughts on this?Paul Taylornoreply@blogger.comtag:blogger.com,1999:blog-6940163880772720830.post-26191702065342660002011-02-22T09:22:54.011-08:002011-02-22T09:22:54.011-08:00What does it matter how strong thewy are? Why the ...What does it matter how strong thewy are? Why the hell would you hang from you umbicals?! They are designed to stop you from dropping a tool not arrest a fall. <br />I can think of nothing worse than a spring loaded axe!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6940163880772720830.post-19134316343160885502011-02-15T08:06:38.997-08:002011-02-15T08:06:38.997-08:00encouraging to hear the strength of the BD 'bi...encouraging to hear the strength of the BD 'biners is so high. <br /><br />I'm using the FS mini's combined with 1/2" tubular "mil-spec" webbing (5kN) for a simple (and very cheap) umbilical set up.<br /><br />I reckon one of the plus's of using the FS mini's would be that in a pinch you're always guarenteed to have 2 extra full-strength carabiners for anchors/protection/etc. nice to have multiple applications for the same piece of kit8minutememehttps://www.blogger.com/profile/12146163247364694285noreply@blogger.comtag:blogger.com,1999:blog-6940163880772720830.post-64251015096013461382011-02-14T15:48:36.440-08:002011-02-14T15:48:36.440-08:00Problem is I don't know the strength of any of...Problem is I don't know the strength of any of this stuff including the webbing. I am sure BD has numbers but they are saying 2KN. It may not be normal tube nylon we are use to. BD doesn't really look like it and my older Grivels I don't think they are still making in 9/16 or bigger stuff. The biners aren't the issue although the swivel might be. But I really have no clue which seems kinda silly that we all don't just know what this stuff is good for. Why anyone woudl build climbing gear below 1500# pull strength is beyond me.Danehttps://www.blogger.com/profile/08300760603627210620noreply@blogger.comtag:blogger.com,1999:blog-6940163880772720830.post-91356242529168502552011-02-14T15:07:51.765-08:002011-02-14T15:07:51.765-08:00Dane,
Do you know the strength of the BD umbilical...Dane,<br />Do you know the strength of the BD umbilicals and swivel themselves? Is the biner the weakest link? If so, could you cut it out and use the fs mini or similar full strength mini biner?Anonymousnoreply@blogger.com