Weight rating question

[Yojimbo]

I'm heading out this weekend and need to outfit a friend. He's 350#. Would a double layer of HyperD 1.1 be enough? Or should I double up two single layer 1.7's?

[2 Samuel 22]

Simply Light Designs lists their Tree Runner DL 1.1 weight rating to under 250lbs
Warbonnet Outdoors lists their DL 1.1 fabric at 275lbs
Wilderness Logics Lite Owl in DL 1.0 ripstop has a max rating of 300lbs

If it were a double layer Hexon 1.0 then you'd probably be okay but I would say 350lbs is too much for a DL 1.1 HyperD hammock. Doubling the 1.7s are the way to go.

[oldgringo]

Grand Trunk Parachute hammocks are rated to 400#.

[hutzelbein]

Ripstopbytheroll says that a single layer 1.0oz HyperD is good to 200lbs. Sadly they don't give a capacity for a 1.0oz HyperD double layer, but from what I have seen a second layer with the same fabric increases the capacity by a factor of about 1.5. So a 1.0oz HyperD DL should hold 300lbs. 350lbs is a bit over the limit, so the risk of it failing is higher, especially when used incorrectly (e.g. with a hang angle that is very shallow). For myself I might risk it, but I wouldn't for a friend. Better double up the 1.7oz SLs.

[sqidmark]

1.7 on the outside and 1.1 on the inside? Or would the effect of the 1.1 be negated in such an arrangement?

[Yojimbo]

Thanks for the replies. Turns out the guy was only 320#. We took the gamble all went well. More strech than I like but alls good. I need to make a heavy weight hammock to keep on hand.