--- In

hammockcamping@yahoogroups.com, Rick <ra1@i...> wrote:

>

> Breaking strength, as promoted by the maker is usually much less than

> the real breaking strength.

We've talked about this from time to time on this web site. Rick makes

a good point that the manufacturer's specs might be conservative. It

makes sense with high quality manufacturers and as long as they don't

get in a 'strength war' that will likely remain the case... for high

quality manufacturers.

There is another factor that I think also comes into play.

Unfortunately I don't have expert knowledge on how it all works so I

can't explain it very well, but I'll try anyway. The tension on the

hammock suspension lines are understood and are a function of the

weight in the hammock and the angle of the hammock suspension lines

relative to the horizon. This chart shows how this angle affects the

tension of the hammock suspension lines:

http://tinyurl.com/7onfm .

What this chart is saying is that at a 30 degree rope angle the tension

on both hammock suspension lines is equal to the weight in the hammock,

at 15 degrees it is twice the weight in the hammock, at 10 degrees it

is three times the weight, at 6 degrees it is five times the weight,

etc. It dramatically shows that where you get in trouble fast is at

small rope angles. But this is where is gets interesting-- at these

small angles there isn't much difference in the rope lengths. For

instance if I calculate the rope lengths for a hammock with a 10 foot

length and 15 feet between the supports, I get rope lengths of 2.54

feet at 6 degrees, 2.62 feet at 10 degrees and 2.76 feet at 15

degrees. Now pay attention because this is like a magic trick! The

percentage difference in rope lengths when you use the 2.54 feet at 6

degrees as a reference is: 3.1 percent at 10 degrees and 8.61 percent

at 15 degrees... and the hammock body itself is also made of nylon

(which is stretchy) which will also help. When the ropes stretch

because of the tension applied to them, they reduce the rope angle and

relieve the tension that is causing the stretch to a tension that they

can support and the ropes don't break when by design they probably

should have failed? Us hammock hangers got lucky on this one.

This does make it hard to hang a hammock because of the stretch when it

is occupied but this is not near the problem for the folks that start

off hanging their hammocks with more rope angle-- you are not stressing

the ropes as bad so they don't stretch as much and because of the

geometry of the larger angles the rope angle is not as sensitive to

changes in the rope lengths.

Now, about those mountain top lots I have for sell in south Florida...

Youngblood