I like the XX design, but the below may improve it in some ways. Before I finally found this thread, I'd independently done a variant of the tensahedron that uses just one X on one side, retaining the tensahedron's V shape on the side where I want to get in the hammock:
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It's hard to tell in the photo, but I made the legs of the V long enough to stick out fairly far to the side. So the hammock is closer to the base of the X than the base of the V but the 3 points of contact on the ground have broadly equal weight. At a mathematical level, anyway, 3 points of contact is better than 4 because you can always find a stable arrangement and you don't get weird internal stresses if the ground is uneven.
But you do get nominally reduced head-to-toe stability because the hammock is over a middle part of the triangle made by the feet. On the other hand, I was never able to shake the stand at all, even being a bit reckless in how I moved around in the hammock and intentionally sliding as far toward my head or toes as I could. Getting your center of gravity several feet away from center is remarkably hard.
Like the XX, it doesn't collapse as you get in, making the addition of a tarp much more straightforward, though I haven't done anything for that.
I found that the point where the X beams cross moves a bit as I shift my weight or get in and out, so decided that I *don't* want to pin them together. The fear is that if you don't place it perfectly, you'll forcing the beams to bend as you get in, which primes them to collapse under heavier loading. But when I initially form the X, I don't tension it very well. Properly cinching it up with substantial force would likely keep things in place better such that pinning the X legs works well. Haven't tried it yet, but that's desirable because it'll make things even more stable for holding at tarp.
For reference, I used (nominal) 2x2" douglas fir pieces 10' long and chosen to be as straight as I could find. That length worked fine to both hold the hammock high enough and have the top wide enough for my 10.5' hammock while still having plenty of width across the base of the X. Having dialed in the cord lengths, I went ahead and spliced Amseel eyes in fixed lengths for the 3 lower cords on the X. For the other two longer legs in the bottom triangle, I made a single long Amsteel cord with eye splices at the end and just tied a loop near the middle to grab the bottom of the V. I tuned the two halves of that to be slightly unequal so that the base of the X is held in such a way that the two legs never touch. If pinning the X, you'd need a slightly different pair of length and trial-and-error will be needed. Here is looking down one leg to see how the two legs are held close but not quite touching.
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My particular prototype is fiddly because the loops can fall off while you're trying to assemble it, but I wanted minimum extra pieces. So I just drilled 1/2" holes and pushed 1/2" diameter Aluminum rods through. Works really well to put the forces directly to where things can most strongly hold them. I used longer ones to pin the top of the X to the top of the V. Worked OK, but it'll tend to get loose over time as it's easy to yank on the long legs and crush the wood around the Aluminum, slowly enlarging the holes. So better methods of attaching everything would seem to be a particular area of improvement. In particular, please don't judge me too harshly for the crappy tying together/rat's nest at the bottom of the V! But note that the two legs of the V can be attached flat-to-flat against the top of the X (as I've done) OR can be flat-to-flat against each other. But not both, so round poles may make life easier.
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I weigh about 170 lb and saw no hints of any problems even bouncing a bit in the hammock. Hope this is amusing and maybe useful to someone...
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