Scale Models of Nearodesic Polyhedron Hexayurt

I’ve been going to Burning Man for a while now, and I, like pretty much everyone else out there, am enamored of the ideas of large-scale projects on the playa. This year, I’ve got a few people camping with me, and I figured a shade structure was in order. I’ve seen a lot of different designs, have experience quite a few of them, but none of them seemed to really match up with what I wanted from a structure. Here’s the list and my thoughts.
Geodesic Dome
I camped with a couple that built a moderately-sized one of these. It took them a solid day to put up, but when it was up, they did pretty well for themselves.
Pros: relatively cheap for the volume you get, sturdy even in high winds, tried and true.
Cons: Difficult to set up, hard to cover well, doesn’t even try to keep out dust, difficult to take down

Conduit Arch
This is the type of structure Jeff used to make. It went up in about 30 mins.
Pros: Very cheap for the volume you get. Very easy to set up and take down. Doesn’t fall over in wind.
Cons: Small footprint. Only keeps out sun, not dust. Bends quite a bit in high wind.

These have become a pretty common sight on the playa. I’ve never been in one, but I’ve heard good things.
Pros: Keep out heat, dust, wind, and sunshine. Easy to set up. No flex even in high wind.
Cons: Slightly more expensive than other options. Too short for me to stand up in (6’8″).

My personal tent is quite large, with a foyer-style setup, and 3 tent rooms around it. It provides adequate shade, but it does get really hot inside and it’s time to try something new. I was exploring larger hexayurts when I ran across this post: PDF. The design seems solid, though not geodesic, so not infinitely scalable. I decided to build some prototypes and see how the shape held up.

First, my girlfriend built the 4-sided paper example in the PDF. The design seemed solid, so we decided to keep going and make a bigger model.

I did the first design at about 1/12 scale using thin cardboard and scotch tape.

After that, I decided the cardboard one was still decent, so I pressed on with an actual scale model. As the final material is 4’x8’x1″, and something like foamcore, we decided to use foamcore as a test material. We got 6 sheets of 30″x40″x3/16″ material, which gives us a 3/16 scale model. Since the final one is going to be something like 22 feet across, this is still a decent-sized model. I followed hexayurt instructions and still used scotch tape for most of it, not wanting to go too far out of the realm of physics for the final result.

I have some concerns about the design.

Since the only thing holding the pieces together is tape, if the tape fails, it could be disastrous. Granted, I’ll be using extremely high-grade tape and taking recommendations from the whole of the internet on which tape to use, and maybe even doubling up, but even so, physics is physics, and I may get out there and the wind may tear this thing apart. I set up our industrial fan in front of the model and as long as there’s even light pressure on the dome downwards, it doesn’t show a hint of flex, blowing over, sliding, or anything. I think that as long as the tape holds, the shape is decently aerodynamic and shouldn’t be a huge, dangerous, fiberglass kite.

The main square on the top will be 11 feet off the ground. Holding it up, taping the sides, stopping it from blowing over, and stopping it from tearing apart all in playa wind conditions sounds line a nightmare in the making. So long as we don’t have constant wind, I think we could get the whole thing set up in 6 hours, easy, and I’m pretty sure we could do it in the dark if we had to. I think the design is flexible enough that small tape would hold at the start, and we could reinforce as time went on. I’ll be doing a trial run with cheaper tape as a test, but it won’t be on the playa and it won’t be 60mph winds, and it won’t be 100 degrees out.

Finally, I worry that the whole thing will be a big oven. People say the insulation is good and that the darkness is good, and that the whole thing can be aerated and swamp cooled and whatnot, but I worry that 8 hours of blazing sun will cook us. We’ll have 4 doors as options, but will it be enough? Time will tell. People survive in hexayurts, I assume the concept is the same.

I haven’t come up with a good name yet, icosayurt? tetrahedroyurt? Snub yurt?

Posted in Burning Man, Hobbies | 9 Comments

9 Responses to Scale Models of Nearodesic Polyhedron Hexayurt

  1. fran says:

    I can just see the strips of cloth in bunches, soaked with dripping water tattering from each of the doorways…

    Maybe to anchor it, you could use those corkscrew thingys that are used as dog tie-outs. I’ve tied a horse to one of those they’re pretty strong, but it was in a lawn. About 18″ in… But I have no idea if the playa can be pierced.

    • Morgan Engel says:

      The Playa can indeed be pierced, we prefer to use rebar hammered into the ground. It works really well, though is a little bit dangerous having it sticking out like that.

  2. Cassidy says:

    I had the same idea… I included a url for the write-up I just did in Google Documents (a slide show of how we put together a small model of a Quad Dome). We should talk. We plan on building it next week.

  3. Randy says:

    Cool idea! Building a standard hexayurt this year for the first time. Do you know where you’ll be camping? Would love to check out your design in action!

  4. Zelia says:

    Interesting ttoguhhs here. I appreciate you taking the time to share them with us all. It’s people like you that make my day 🙂

  5. Bob says:

    Get a bunch of old tennis balls (bright orange is best). Punch a hole in them and push over the ends of exposed rebar…

    • Morgan Engel says:

      Tennis balls, plastic bottles, those orange safety caps they sell at Home Depot, they all work well and are all mandatory. Too many horribly scarred shins out there in the world because of exposed rebar.

  6. andrew says:

    any pics of the final product?

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