I decided to nerd out a bit this morning and ran some quick numbers and for force in the strap you are 100% correct.
I made the free body diagram below though I used the angle between the straps rather than the angle off the tree as that will depend on the size of the tree as well. This is just for the union of the straps. If you isolate that section (what a free body diagram is) the forces in x and y have to be equal or the system will be in motion (unbalanced force = acceleration). And hopefully nothing is moving. It is pretty straight forward statics which is really vector calculus which is mostly trigonometry. To get the force in the two legs of the strap sine is used.
https://www.hammockforums.net/galler.../3/8/5/fbd.jpg
I dumped this in excel and made the following graph of force in the strap vs. angle for a 200lb load. How this equated to a person’s weight is a different matter and though about a 30° hang the load in each strap is about the same as the persons weight even though there are two of them but by the same rules above it ends up doubling the vertical load (sin of 30° is 0.5).
https://www.hammockforums.net/galler...e_vs_angle.jpg
For the load on your strap itself, this angle is pretty important. And for the constriction on the tree. I wonder what the strap ratings mean when they say up to '400lbs'. I am guessingthey mean 400lbs tensile load per strap. Though if I ran these same numbers for a 400lb person the numbers here would be doubled. Inthiscase,i you cinched your straps tight (140°) the load in the strap itself would be 600lbs.
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