Moderator: Tim White
GoHighGoDeep wrote:I was rigging a pit recently and one of the people I was with was questioning the strength of my BD 10mm Spectra slings as an anchor around a tree, even though they're rated at 22kn (1kn = 224.81 ft/lbs). . . .
I'm not intending to get into a discussion of natural anchors and their pros/cons, etc. I'm more interested in thoughts/insights/facts regarding use of webbing/slings for rigging from natural anchors.
speloman wrote: I tend to use webbing (doubled of coarse) with a Double Fig of eight on a bight on the main line. . . . . Plus webbing is cheaper to replace if damaged. Just make sure to Double up. (My opinion)
Ralph E. Powers wrote:I myself have never known or heard of a properly tied and DRESSED water-knot coming loose or undone. Same with a figure 8 knot done in the same manner.
All knots; whether with webbing or with rope should be pre-tensioned before use. They should be dressed so that the full advantage of their strength can be utilized. One should be able to descend and ascend on said knot with confidence that it will hold even the weight of two (tandem) climbers.
It's just plain common sense.
...I was initally taught that using a wrap three pull two was an excellent anchor around either a bomb-proof rock or tree. The (water) knot used on 1-inch tubular webbing should be at the back of the anchor. If there isn't sufficent webbing to wrap three then wrap two pull one is suitable...
Stridergdm wrote:(Oh, ok, I admit some of us enjoy just the pure fun of rigging, but really, it's all to get into the cave, right?
NZcaver wrote:...I was initally taught that using a wrap three pull two was an excellent anchor around either a bomb-proof rock or tree. The (water) knot used on 1-inch tubular webbing should be at the back of the anchor. If there isn't sufficent webbing to wrap three then wrap two pull one is suitable...
Actually, the Water Knot securing the webbing for a W3P2 (or W2P1) ends up at the FRONT of the anchor, directly against the rock/tree/etc. The other strand(s) of webbing are what you clip into, leaving the one wrap with the knot in it against the anchor.
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