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This was in the backyard. The trick was figuring out how to anchor it without any trees in that location. I used a trick where you take a board and drill several holes in it at angles. All of the holes are angled so the rebar stakes attack forward, but you alternate the left right angle to grab more ground. The last three are different. The very last one need to be near the end of the board so you can get a caribener or a ratchet strap hook under there. And then the other two closest to that end are angled only left and right to nail the board down. Now this board can't move up, down or forward, and your hook or beaner is securely under the board.
The next sketch thing I did was instead of using a bipod like other people do who build similar things to stand the webbing up I just used some pretty well built lawn chairs. The arm rests of these things I would happily stand on. And the force that these are going to feel is going to be almost identical to simply your vertical weight. Only a little more from the line tension.
But I did see some giant logs on the side of the road in my neighborhood and I might grab them. Maybe having to roll giant logs into place would be an annoyance and they would have to hang out on the back patio. So maybe doing that would be a mistake. But it would look cool. I'll sleep on it.
But really I want to host a bunch of grilling parties this summer and it might be cool to have.
Basically it's this design: https://www.youtube.com/watch?v=ij9FQm4SgAc
But I used wood instead of metal for the anchor.
Neato! I like unconventional DIY stuff.
If it suits you, bury the anchors making them invisible, except for the exposed bit of chain, rope, or carabiner, yet always ready for use.
I wonder if those might have been effective at Burning Man in some cases. It sucked to walk into rebar stakes when fools didn't cover the ends with tennis balls, empty bottles, or glow sticks.
Unrelated, yesterday Vicki, my housemate and Winton's wife, was showing us videos of a 1.1km zip-line she's going to do while bouncing around South Africa. She leaves in a couple weeks.
One issue with buried anchors is something does have to come out of the ground. That's an issue with mowing.
I saw the cover that guy made but I think it looks kind of lame. I just don't see how someone would end up on the rebar. All the forces of a slack line are radial to that line. I would take some pretty extreme effort to jump from it onto the rebar. With limited grip in that direction it would take coordination to jump that far in that direction. But also because I'm dealing with a lot of roots one rebar always has a chance of not going fully down. So couldn't use his slim cover anyway. Maybe some milk crates? I'd have to shrink the length of the anchors.