Originally Posted by CheeZe
... i have used a paracord prusik to make my hammock adjustable 2 times now and it seems to hold me fine. ...
Count yourself lucky.
There are numerous factors that degrade the supposed strength of lines AND increase the actual effective weight force. Together, these cause deaths and injuries in riggings. Professional riggers use rules of thumb for safety factors, such as 5-to-1 for this and 10-to-1 for that. Line strength-to-load weight.
Knots, bends, gear, splices, sharp angles, even wear-and-tear, and the like take strength out of a line. It can be reduced in strength up to 80%. Your 1,000 line is suddenly good for 200 lbs and you didn't realize it.
Amsteel seems to be one company that rates its line strength taking into account splices. I say good for them!
Hanging at anything other than straight down, with the line being vertical, increases the effective weight on the line due to the laws of physics and geometry. If you hang with your suspension lines at 30% down from horizontal (recommended) your weight is DOUBLED, but with half on each line. Thus if you are 200 lbs, you are putting 200 lbs of force on EACH of the two suspension lines. Actually, if you weigh 200 lbs, the total will be more due to your sleeping pad, bag, and whatever else you put in the hammock.
However, that's only if you don't so much as breath. Otherwise, you start to create dynamic weight, not just static weight. Think what a bathroom scale does when you step on it. You have to stand still for it to settle DOWN to your true weight. If you toss and turn in your hammock, you create shock (dynamic) weight for an instant or two. Suddenly, your 200 lbs of "actual" weight becomes 300 lbs, let's say.
Now, in this example, your 1,000 line is down to 200 lbs of strength and your 200 lb body is putting 300 lbs of effective force on the line.
Are you willing to risk your backbone over those roots and rocks you had to hang over?
It's your choice. Knowledge is power.