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 09-12-2011, 20:35 #11 SGT Rock Senior Member     Join Date: Nov 2006 Location: Maryville, TN Hammock: Home made Ghost Hammock Tarp: 7'x9' cuben tarp Insulation: Pads and quilts Suspension: UCRs, Dutchware View my gallery 92 Posts: 1,749 Images: 92 I just sent HB a long e-mail explaining this stuff as best I understand it. The way I remember this, a knot generally reduces the strength of the line by 50%. And you do this for each knot. So if you start with 1600 strength and tie a knot to make a synch for the hammock end, then the strength is now 800. Then add another knot to tie the line to the straps and you are at about 400 strength... (please correct me if I am wrong). Then take your hammock angle. 30% being optimal, that would mean that each line would support the same amount of weight, so a 200 pound man would put 200 pounds of force on each line. Again, correct me if I am wrong. And this is just static weight. If there were some wind blowing and swaying, the weight is then calculated at weight*velocity^2, so a 200 pound guy could easily cause 400 pounds of force. And if the line gets wet in the rain it also loses some strength, which explains why both times I broke support lines on my old homemade hammock the lines were wet and the wind was blowing. That was prior to using dynaglide and/or amsteel. __________________ NO SNIVELING! www.hikinghq.net - Hiking H.Q. www.bmtguide.com - the BMT Thru Hiker's Guide
 09-13-2011, 04:19 #12 opie Senior Member     Join Date: Mar 2009 Location: Lansing, MI Hammock: Grizz Bridge Tarp: Etowah, gargoyle Insulation: Wool, heater Suspension: Varies Posts: 3,379 I believe you are correct on all your assertions other than the knot derate being cumulative. __________________ I am not a gram weenie. , But Im starting to see the merits!!! Kris' Splicing Kris on Facebook
 09-13-2011, 05:49 #13 Acer     Join Date: Jul 2011 Location: Southern Indiana Wooded Hills Hammock: WBRR, BMBH UL, Diy M90 MR Gathered Tarp: HG Cuben 4/Tadpole Insulation: Lynx/UGQ/TeWa Suspension: Straps/Dutch Bling View my gallery 14 Posts: 3,886 Images: 14 please post your findings Sgt Rock as everything your posting is a learning experience for all of us on yur findings about line strength. I never paid attention but always using amsteel just for the over strength effects so that I wouldn't worry about breakage. I use 1/8th myself and sacrifice a couple of ozs.
 09-13-2011, 07:14 #14 nothermark   Join Date: Sep 2010 Location: Rochester, NY Hammock: Hennesy Tarp: various Insulation: pads, foam View my gallery 17 Posts: 3,826 Images: 17 FWIW - I think you should look beyond climbing ropes. Sampson Utility braide exceeds your spec and stretches less. http://www.samsonrope.com/index.cfm?...ope=111&inst=1
09-13-2011, 18:48   #15
SGT Rock
Senior Member

Join Date: Nov 2006
Location: Maryville, TN
Tarp: 7'x9' cuben tarp
Suspension: UCRs, Dutchware
View my gallery 92
Posts: 1,749
Images: 92
Quote:
 Originally Posted by opie I believe you are correct on all your assertions other than the knot derate being cumulative.
You are right. I went and looked up my source for the factoid that multiple knots mean increased reduction in strength. It looks like he meant it as a jest.
__________________
NO SNIVELING!
www.hikinghq.net - Hiking H.Q.
www.bmtguide.com - the BMT Thru Hiker's Guide

 09-13-2011, 18:53 #16 SGT Rock Senior Member     Join Date: Nov 2006 Location: Maryville, TN Hammock: Home made Ghost Hammock Tarp: 7'x9' cuben tarp Insulation: Pads and quilts Suspension: UCRs, Dutchware View my gallery 92 Posts: 1,749 Images: 92 I got an answer back from HB. Looks like their 6 mm rope is rated at a breaking strength of 1221 lbs. So if you went with the generally accepted 5:1 ratio, that means you are looking at 244 pound limit. __________________ NO SNIVELING! www.hikinghq.net - Hiking H.Q. www.bmtguide.com - the BMT Thru Hiker's Guide
 09-13-2011, 19:08 #17 opie Senior Member     Join Date: Mar 2009 Location: Lansing, MI Hammock: Grizz Bridge Tarp: Etowah, gargoyle Insulation: Wool, heater Suspension: Varies Posts: 3,379 Im surprised they are calling it "climbing" rope with a number that low. All in all I think its safe for hanging, however, at that number. __________________ I am not a gram weenie. , But Im starting to see the merits!!! Kris' Splicing Kris on Facebook
 09-13-2011, 20:05 #18 SGT Rock Senior Member     Join Date: Nov 2006 Location: Maryville, TN Hammock: Home made Ghost Hammock Tarp: 7'x9' cuben tarp Insulation: Pads and quilts Suspension: UCRs, Dutchware View my gallery 92 Posts: 1,749 Images: 92 I agree with everything you just said. To be fair to Hammock Bliss I'm editing some new material into the review. It should be uploaded tonight. If it were me I would make the tarp out of sil-nylon and nanoseum net, and make the bottom out of tyvek instead of "parachute material". Then I would do a continuous ridge-line out of something lighter and attach it with prusiks, it doesn't need to be 1221 lb rope for that. After all that, I would replace the climbing rope on the hammock with Dynaglide WS. I'd probably make the tarp about a foot wider too. __________________ NO SNIVELING! www.hikinghq.net - Hiking H.Q. www.bmtguide.com - the BMT Thru Hiker's Guide

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