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roof rack can carry hammock

15720 Views 15 Replies 10 Participants Last post by  raz-0, 
B


hi all
is this possible ? :)
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Beerwolf70
I don't see why not. The roof racks are real and can carry a load. Shouldn't be a problem unless you don't have the women or dog. ;)
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B
thank you :)
but jeep says, total load capacity 68kg for both roof racks
this is confusing :)


NOTE: Crossbars can be purchased at a authorized
dealer through Mopar® parts. External racks do not
increase the total load carrying capacity of the vehicle. Be
sure that the total occupant and luggage load inside the
vehicle, plus the load on the Roof Luggage Rack, do not
exceed the maximum vehicle load capacity.
The load carried on the roof, when equipped with a
luggage rack, must not exceed 150 lbs (68 kg), and it
should be uniformly distributed over the cargo area.
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P
That sort of a load doesn't seem to be in line with the capacities listed by Jeep. That sort of mount to the roof rack would give you a tensile force and shear force combo that Jeep doesn't reference limits.

There are a few engineers on here that might be able to better explain the theoretical limits of the roof rails, but I wouldn't do that... especially with two people. That's at least 300 lbs of downward and lateral force, even if part of it is being shared by the tree.
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Lackadazikal
Don't think I'd necessarily really want to do that anyway. And those silly people - they're missing the great view.
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Foobar
I don't think the roof rack is designed for lateral stress. I wouldn't count on that. Those two in the hammock that long with that much sag are exerting a lateral tension exceeding 400 lbf if my math is correct.
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wn7ant
Foobar said:
I don't think the roof rack is designed for lateral stress. I wouldn't count on that. Those two in the hammock that long with that much sag are exerting a lateral tension exceeding 400 lbf if my math is correct.
Click to expand...
I'm not saying your math is wrong, but I want to point out one thing that the picture... hides.

The force is not perpendicular to the center of the roof rail (farthest from the connections to the roof). If you'll notice, it is pulling toward the back of the rail where it is fastened to the roof.

Again, I'm not an engineer, and I'm not saying this makes everything okay, just pointing out that you have to consider the perspective of this photo, where the force is applied in relation to connections, and for how long...

If I WERE (not saying I am) going to do this, I'd tie a rope between the roof racks, at the back where they connect to the roof. Then I would tie the hammock to the center of the rope crossbar I just made, so that the load was distributed between the racks, at the fasteners to the roof. I suspect I'd sleep well enough by myself in this configuration. The person I'd share with only weighs 120...in a soaking wet fur coat... so I doubt the forces would be an issue. But that's just my opinion, YMMV.
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raz-0
wn7ant said:
I'm not saying your math is wrong, but I want to point out one thing that the picture... hides.

The force is not perpendicular to the center of the roof rail (farthest from the connections to the roof). If you'll notice, it is pulling toward the back of the rail where it is fastened to the roof.

Again, I'm not an engineer, and I'm not saying this makes everything okay, just pointing out that you have to consider the perspective of this photo, where the force is applied in relation to connections, and for how long...

If I WERE (not saying I am) going to do this, I'd tie a rope between the roof racks, at the back where they connect to the roof. Then I would tie the hammock to the center of the rope crossbar I just made, so that the load was distributed between the racks, at the fasteners to the roof. I suspect I'd sleep well enough by myself in this configuration. The person I'd share with only weighs 120...in a soaking wet fur coat... so I doubt the forces would be an issue. But that's just my opinion, YMMV.
Click to expand...
I wouldn't do that as from your description, you would be pulling down on the spoiler, which I suspect would result in much badness.
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wn7ant
raz-0 said:
I wouldn't do that as from your description, you would be pulling down on the spoiler, which I suspect would result in much badness.
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Make the "crossbar" long enough to loop under the spoiler.
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B
thanks all,

do you have an idea, where did they tie rope

https://jessynelson.files.wordpress.com/2014/04/dsc_0342.jpg
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Lackadazikal
Looks like from the inside grab handles.
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Willy
well the plus side is if you do it and it breaks you can politely point to Jeeps advert and say FIX IT!
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Rufus
I think this goes to the old saying, "Just because it can be done, doesn't mean it should be done."
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B
so you say i must find 2 trees at proper distance :)
thanks all
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F
That is just a marketing shot, no engineers were consulted or harmed during this photo shoot.

If you tie it on, and gently sit down, even with two people, you will not create a sudden shock load to the mount points and it will hold. The mounts have a safety factor built in that exceeds the published load rating.

Try this more than a few times and you will get lateral shear forces that will permenatly detach your roof rails from your sheet metal.
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raz-0
batuhan said:
thanks all,

do you have an idea, where did they tie rope

https://jessynelson.files.wordpress.com/2014/04/dsc_0342.jpg
Click to expand...
Looks like under the roof to the roll bar on the wrangler. Perhaps the other one has a roll cage installed, or they might have it hooked up to a seatbelt anchor point or something else strongly attached to the unibody.
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