Ridgeline Physics

[Countrybois]

So if I read the graph right, at a 30* hang angle (1/2 of 180*-120*) the pull on each tree will be equal to your weight.

That is correct

Sent from my SAMSUNG-SM-G891A using Tapatalk

[dscotthep]

So if I read the graph right, at a 30* hang angle (1/2 of 180*-120*) the pull on each tree will be equal to your weight.

Derek Hansen over at the Ultimate Hang demonstrated this using a couple of scales. In the video he promises more tests, but that was almost 6 years ago and I haven't seen any follow up. Maybe I'm not looking in the right place.

[jeff-oh]

So if I read the graph right, at a 30* hang angle (1/2 of 180*-120*) the pull on each tree will be equal to your weight.

Mathematically yes. The ideal hang angle will tension each suspension line equal to the load in the hammock, assuming the center of gravity is in the middle. The tension in the ridgeline would then be approx 85% of the load.

[Grego]

You may also find the link below interesting. The high tension calculator is very pertinent to hammocks. If you know some of the values and enter them in it will calculate the others.

https://www.ropelab.com.au/two-point-anchor-calculator/


Sent from my iPhone using Tapatalk

[Grego]

The two point anchor calculator is also great if you are dealing with anchors of varied heights—both spit out values for forces and angles nicely in addition to other pertinent information


Sent from my iPhone using Tapatalk

[snowtrac]

You may also find the link below interesting. The high tension calculator is very pertinent to hammocks. If you know some of the values and enter them in it will calculate the others.

https://www.ropelab.com.au/two-point-anchor-calculator/


Sent from my iPhone using Tapatalk

Nice find. Thanks for posting the link...

[SutterButtes]

Are you trolling us kroma? Dang this must be one of the oldest post still on the server. Good subject. Anyway I donate something and hope you arent trolling us.

I thought this was interesting I don't know if it will help.

I don't know if Kroma was trolling or not but as a newbie I find this stuff to be very interesting.

I am currently trying to figure out how to do DIY my suspension for my first hammock setup and was wondering if zing-it/lash-it really is sufficient for a structural ridgeline. I doubt I would have found this post since it was from 2007. Plus I appreciate all the new comments that add to the knowledge available in 2007.

If I understand the information provided in this thread (which I will read over again when I don't have a headache) I believe the answer is yes, zing-it/lash-it is sufficient for a structural ridgeline for a hammock that is hung at a 30 degree angle. Please correct me if I am wrong. I am planning to buy hammock material and suspension materials tomorrow.

[SutterButtes]

Mathematically yes. The ideal hang angle will tension each suspension line equal to the load in the hammock, assuming the center of gravity is in the middle. The tension in the ridgeline would then be approx 85% of the load.

How would the tension in the ridgeline change if I were to move most of my weight to one end of the hammock? And would it affect the weight rating I would need for my hammock fabric? (Sorry if this is a a dumb question. I love science but physics is pretty much over my head even though I wish I understood it.)

[deadeye]

How would the tension in the ridgeline change if I were to move most of my weight to one end of the hammock? And would it affect the weight rating I would need for my hammock fabric? (Sorry if this is a a dumb question. I love science but physics is pretty much over my head even though I wish I understood it.)

Not a dumb question. I'm an accountant, but I got A's in physics in high school and college, and haven't been able to use them until now. I believe that moving the suspended weight from the center to either end would change the angles of the hang, thereby increasing the load on one line and decreasing the load on the other. These hypothetical situations are sometimes clearer if you take it the to the extreme: picture all your weight next to one tree, essentially hanging vertically from that end, there would be very little tension on the line going to the other tree.

[jeff-oh]

How would the tension in the ridgeline change if I were to move most of my weight to one end of the hammock? And would it affect the weight rating I would need for my hammock fabric? (Sorry if this is a a dumb question. I love science but physics is pretty much over my head even though I wish I understood it.)

If you shift your weight to one end or the other then it will load up that side a bit more but not enought to worry about. i.e if you shift such that load is at the 1/3 - 2/3rds point then the load in the straps changes ~3%. not enough to fret over.