In hanging my bridge hammocks I have sometimes found that the trees are too close together because the 7/64" whoopies slings I use require an extra 18 inches at each end.
01 whoopie sling - 17 inch.JPG
I can double the whoopies around the strap toggles to halve their length, but that makes adjustment under load difficult. (Does not pass "the mitten test" for winter camping.)
02 whoopie sling - 17 inch doubled.JPG
Lately, I've used loopy slings to make the suspensions shorter. Incidentally, the lines shown in the rest of these pictures are 1.8 mm dyneema, advertised as 900 lb. test, which makes it similar to Dynaglide. You could use Amsteel for these suspensions also. Adjustment frequently involves rotating the loop around its attachment points (strap toggle at the tree end and hammock suspension triangles at the other end) - very difficult under tension, so it definitely does not pass the mitten test.
03 loopy sling.JPG
These are fiddly - I need to adjust the suspension bury, then adjust the location of the 1/16" bungee attachment with the Klemheist knot to maintain tension on the left end of the suspension bury. I can get the length of the loop down to 7 inches - just a bit shorter than the doubled whoopie sling above. (Another inch or two shorter is possible. I am conservative on my bury lengths with this lighter line.) Forget the mitten test - Frostbite warning! But remember, I have managed to move my trees 22 inches closer together.
04 loopy sling - min 7 inches.JPG Sorry for the shadow in this picture. You're looking at a single strand loop that passes through itself.
What if I could do better? I'll try a plain klemheist knot instead of the loopy sling bury. Here's my first attempt. It's effectively an adjustable continuous loop. Klemheist knots, like prussics, work best wrapped around heavier line, so I just wrapped it around a doubled line - no shadows here. (Ignore the diamond knot as a stopper on the right. A plain overhand knot would do, and it shouldn't be needed, anyway.)
05 small Klemheist sling aka adjustable continuous loop.jpg
So far, so good. How's it work for a hammock suspension? Here's an 8 foot piece of the same dyneema line, doubled, with the middle loop used for the klemheist knot. It yields a "klemheist loop" up to 20 inches long. Early testing (this morning) suggests that it passes the mitten test
06 Klemheist sling - 20 inch.JPG Edit: I mistakenly said I used a 4 foot piece of line for this loop. Incidentally, starting with a 12 foot piece of line yields a klemheist loop that expands to about 32". These doubled loops turn out to be only slightly lighter than an amsteel whoopie of similar finished length, which can be made from a shorter piece of line.
... and, it adjusts down to 2 inches (theoretically - I'd want a bigger loop to get it over the strap toggle marlinspike hitch).
07 Klemheist sling - 2 inch.JPG That's the klemheist loop on the left.
Here's where I say, "Don't try this at home, kids! Wait for me to do exhaustive testing (tonight)." So far this suspension has withstood a 150 lb. hanger getting into and out of the hammock twice. So, purely as an intellectual exercise, try to wrap your mind around tying a klemheist knot around itself.
Hint: 08 Klemheist sling - tying.jpg
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