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>At 08:27 PM 7/1/98 -0400, john.r.strohm@BI*.co* wrote: >>>There are more efficient knots...One being the figure eight which has an >>>average strength of 85% of the breaking strength of the rope...Or the >>>tubing if you prefer. The figure nine is even stronger..although for most >>>vertical work...In which case, my butt is on the line...I use the figure >>>eight backed up with a overhand knot. >> >>I don't understand. I know the figure eight knot as something you put in >>the end of a line, to keep it from running out of a block, or your fingers, >>without getting stopped. I am not familiar with the figure nine. How do >>you use a figure eight knot to make a loop? > > >There are two ways to tie the figure eight loop. The first is to simply >take a bight of rope, surgical tubing, etc... and tie it the same as an >overhand loop, except with a extra wrap before passing the loop back through. > >The second is to tie the figure eight as you have discribed. Then simply >rethread the end back into the knot following it in reverse leaving as >small or as large as loop as desired. This is how it would be used to rig >around a tree or anchor for abseiling or ascending using single rope >technique. > >It's more difficult to describe how these are tied than to simply show a >person. But I hope you get the picture. > >"SILT HAPPENS" JD > JEFF DISLER > SAFE DIVING > NSS 26000 The reason I would not use the 8 in this instance is that it would be very hard to tie with tubing, would create a very large knot, and the tail sticks out from the knot. The tail for a bowline ends up pointing into the loop which makes for a clean application. As far as strength, you are right, but it is really not an issue in this application. I would use a barrel knot for the same reason when I need to join two ropes; a double fisherman's knot has the tails stick out and the barrel knot is more streamlined. A fine point, and they are both good knots. I'll have to try Jim's method and decide which one I like best. Later, Mike W. PS - I use an 8 as a stopper knot a lot, but as a loop forming knot, it is too slow to tie, bulky, and the bowline is strong enough if you have the safety margin you should be using anyway for life support lines (10 to 20 times the working load). But then I don't use single line climbing methods much either, and that (and rescue work) is the most common usage of the "loop 8". Yea Yea....I'm off topic, I'll shut up now. :-) -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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