I was laying in my diy hammock last night. 1.9 dwr ripstop nylon with 7/64 amsteel suspension marlin spiked to straps around tree. I am laying there looking at those skinny little strings holding my butt off the ground and got to wondering just how safe is this so i did a little research. I went to samson rope web site for some interesting information.
According to samson working test of a rope is 1/5 of breaking test. And if life and limb safety is involved then it is less than that. If you figure 1/7 then that brings that 1600 down to around 230 lbs. further reduction in rope strength is caused be wear, age, deterioration cause be shock (squirming around trying to get everything situated. I bet i look like a grasshopper caught in a spider web, causes damage to the rope).
Realistically though that still keeps it close to my eno atlas straps rated at 200 lbs each. That is a fair safety margin but 1/8 or 3/16 would be a lot safer. I aint gonna hang over no rocks, cacti, rattlesnakes and i gonna hang low. We need to keep an eye on our suspension and replace suspect items. I realize that 1/5 or 1/7 is worse case senario, plus most of hangers don' t hang that high anyhow. I may replace mine with 3/16 as they get ratty looking. But for now i ain't hanging over no rocks, cacti, or rattlesnakes an gonna hang it low.