Re: the adjustable ridgeline, Aaron has you on the right track. You never know when a comfort issue forces you to experiment with your ridgeline. I'm rather new to the hanging life and have hung indoors numerous times and 3-4x outside now and I still can't decide on 83, 85, 87, 89% etc. My comfort has no consistency from night to night. I've tried 83% on a 143" rag, but right now I favor 87%.
Re: how long a rope to cut for your dogbone, my mileage varies on this. For a different use, I started with 52" of 7/64" amsteel blue. I made marks 4" and 10" from one end, then made marks 4" and 8" from the other end, hoping for loops 2" and 4". (I didn't add any rope for a taper, instead tapering 3/4" of each end.)
52" -10" -8" = 34" in between the two middle marks. When done I had a ~37" long dogbone with a 2.5" loop on one end and a 1.5" loop on the other end. 37-2.5-1.5=33. The locked Brummels and the buries ate up 1" from each loop and 1" from the middle section.
To make a 110" dogbone of 7/64" Amsteel Blue with 2" loops, I'd cut 125" of rope for marks 4" and 9" from each end plus 106" in the middle plus 1" for the buries=107". [9" + 9" + 107" = 125".]
To make a ridgeline of 7/64" Amsteel Blue adjustable from 100 -125" I'd cut 167" of rope, mark 4" and 9" from one end and make the brummel at that end. Then I'd make marks 91" and 100" further out, pulling the free end through the latter and pulling it out at the 91" mark. Then I'd make marks 2.5 and 6" from the free end and splice the end into the 2.5" mark (pulling from the 6" mark). I'd also try to remember to splice a 1" section of scrap rope into the loop or pass a bead onto the loop to keep myself from pulling it through the bury. See my picture below. The extra cost for an adjustable ridgeline is pretty cheap: under 4 feet extra rope.
Scan_20140720.jpg
Take notes and good luck.
Don't worry, hang happy!
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