Yep, that is the reason I tested my hammock with the weight of the
two of us as well. I use three bar tacks presently, but I am trying
to make it strong enough to hold about 600 pounds... unlike in my
climbing days when I would not have been satisfied with a load
strength of under 3000-6000 pounds. It is amazing how much pull you
can get in a fall.
If anyone wants to put together a hammock that works perfectly well
for two so you can do tests on webbing, just use two layers of 1.9
ripstop. It works very nicely.
--- In firstname.lastname@example.org, "Ed Speer" <info@s...> wrote:
> Jim, Rick Just a note about testing webbing strength--Any stitching
> holding the webbing together (as in the knots or end loops) will
> probably be the weak point. I've had no problem using 4 heavy bar
> in a 4" length, but the quality of the bar tacks & the thread is
> critical. Weak bar tacks can easily fail, one at a time. A
> rope climbing expert has recently told me that 4-7 well made bar
> are standard on climbing harnesses. Sewing bar tacks too heavy, or
> too many needle holes, can also damage and weaken the webbing--use a
> round point needle when possible. Otherwise, sew up to 7 bar tacks-
> they fail, they may do so slowly enought for you to react in time.
> Inspect the stichting often! ...Ed
> -----Original Message-----
> From: Risk [mailto:geoflyfisher@y...]
> Sent: Tuesday, July 01, 2003 11:34 PM
> To: email@example.com
> Subject: Hammock Camping Re: Three Digests Later...
> Jim wrote:
> One of the problems I have with a webbing based tie-off system on a
> homemade hammock is that I can't know for sure what the strength of
> the webbing is. It's not typically something printed anywhere.
> I agree it is not printed anywhere and no one can tell you how
> it is, and if they knew why you wanted to know, you can bet they
> would say it is not strong enough.
> Fortunately, one can easily test the stuff. Once you find a source
> that is acceptable, you can trust it for a while.
> Easiest method is to tie the webbing between two trees and have you
> and your friend sit on it. This is a rather standard engineering
> method of stressing something to twice its normal load. If you are
> concerned about hurting yourself, put something soft on the ground
> during the test. Webbing does not usually fail with a bang, but
> a zipper like sound of breaking as the lengthwise threads snap. I
> have not had any of the 1 inch poly webbing I have gotten from the
> fabric store or from Walmart or from Outdoor Wilderness Fabrics or
> Seattle fabrics fail this test. The test has not even been
> destructive... the same webbing I tested seems perfectly strong
> enough for operational use.
> So if that is what is keeping you from experimenting, give it a try.
> BTW, the hammock itself with it's bartacked loops of webbing can be
> tested with the two person test in a 1.9 oz hammock as well. Here
> you are risking the hammock fabric too, because it really is close
> breaking when you get 400 pounds in the hammock, but it does
> to increase your faith in the product.
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