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05-27-2008, 08:36   #13
Youngblood
Senior Member

Join Date: Dec 2007
Location: Doraville, GA
Posts: 952
Quote:
 Originally Posted by bigbadwolfusa Boy time flies when you start reading on this forum...Thanks to all for your posts...I really appreciate the help...I went out and measured were I set up in the back. My problem here is nowhere to hang from...But where I did hang from in the pictures above the distance was 19' 6"...Mamas cloths line was as high as I could go up and that was 6' 6". So maybe from what I gather by the comments here is to go higher up. As HH web site states in there setup instructions "Distance between trees. The recommended distance between trees is 12' to 25' feet / 3.658 to 7.62 meter for the Expedition Asym and Ulralight Backpacker Asym models and 13'-26' / 3.962-7.925 meters for the Explorer and Safari models." So at 19' 6" I landed right in the middle....so maybe I have to go higher up. I"ll have to find another place to try this....
Mike,

Those recommended distance numbers sound suspicious. That sounds like someones calculations based on how long the tarps are for the minimum span and how long the hammock suspension lines are for the maximum span. They are assuming you can just tighten and retighten and retighten the suspension lines to raise the hammock. Maybe you can but I'm a little skeptic about being doing that when the hammocks are loaded to their rated weights.

There is going to be some sag in the suspension lines of a weighted hammock, they are not going to stay horizontal. How much they sag is going to be a function of several things, the weight of the occupant is one of those. The bigger hammocks are rated for bigger people. This is a different problem for a bigger person than it is for a smaller person where weights can vary by a factor of two or so.

The larger model Hennessy's have more sag built into the hammock itself because of the dimensions chosen for the fabric length and ridgeline length. (For reference, the hammocks with structural ridgelines, which all the Hennessy's have, have a sag determined by the ratio of the length of the fabric relative to the length of the ridgeline. The hammock suspension lines have their own independent sag angle and it is the angle the suspension lines have relative to the horizon. If you are pulling the hammock taut, they are near zero until you get in the hammock and the hammock drops.) The advantage of that is comfort, but you need the longer fabric length to handle the increased sag without making the hammock feel too small. The disadvantage to this is the ridgeline ends up higher above the ground. In comparison, if the ridgeline on the UL Backpacker model ends up 4 feet and some inches above the ground when hung properly for a specific individual, then the Safari model's ridgeline would end up 5 feet and some inches above the ground when hung comparably for the same individual. That foot or so difference is built into the geometry of the sag that the hammocks are designed for and there is absolutely, positively, no way what-so-ever around that.

That means that you want to tie those larger models higher on the supports for any particular span, about a foot higher in general unless you can't reach that high and then you have to add extra tension on the suspension to raise the hammock. This is where it gets a little tricky because there are a lot of 'ifs' involved. I can't give you an absolute number or even a fairly solid number, but my guess would be that in the the UL Backpacker model has about a 6 foot span advantage over the Safari model, or more, based on geometry and physics.

But someone can always produce a lighter weight occupant and show that it can be done or maybe even tighten the heck out of everything and get the rated weight in it without anything failing... that time. I don't see that as practical though. What I see is that the larger Hennessy hammocks have a disadvantage when it comes to maximum span.
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