It was just a straight copy and paste. Sorry. On Tue, Aug 17, 2010 at 10:03 AM, Paul Sanow <[email protected]>wrote:
> I have tried to get on the web site but cannot. Is there a typo? > Thanks!!! > > > Date: Mon, 16 Aug 2010 08:47:48 -0700 > > Subject: [hexayurt] Tying your Yurt down 101 > > From: [email protected] > > To: [email protected] > > > > > Got this from another group... > > > > This document is also saved as a word .doc with the pictures, > herehttp://f1. > > grp.yahoofs. com/v1/AC5nTMhPI Wcii_BfbMhxHP_ keJdr9bXiBzIJTEn > > bU6rolVwgJMlUkFN 0Bytt5TKrvIeblqe Opg20Mgoq9xhQiQ/ THE%20WIND% 20CARES > > %20NOT. doc > > > > THE WIND CARES NOT > > > > Tying your shit down 101 > > > > > > > > The wind cares not. It cares > > not that you didn’t sleep, or eat, or drink, or shit. It doesn’t care > > that you > > are having the best time of your life, or that you are having the > > worst day > > ever. The wind is completely indifferent to you and your needs and > > feelings. The > > wind can tear your shit down, break it into pieces, and completely > > ruin your > > day, IFyou let it. > > > > > > > > This article is about tying > > things down in the wind. > > > > > > > > I am neither a structural > > engineer nor materials specialist. I am a 26 year veteran of live show > > production, from major concerts to theme camps and a lot of stuff in > > between. Over that time I’ve picked up a few things > > and learned a lot about what the wind does, how it does it, and ways > > to prevent > > it from doing those things. I’ve seen over $100,000 in concert > > lighting truss > > collapse, fold inward and come crashing down (thankfully no one was > > standing > > under it), and I’ve seem $20 shade structures hold up to sustained > > hurricane > > force winds over a period of days, and just shrug it off. > > > > The difference is the way in which the structure is tied down or > > secured. The difference is also weather > > or not the structure is allowed to oscillate > > and how much. This craft is known as ‘guying’ and HOW you decide to > > ‘guy’ > > your structure can make the difference between a ‘simple’ whiteout, or > > a major > > disaster out on the playa. Do it right and your shade will hold up to > > Godzilla > > on a meth binge, do it wrong and a 20 mph gust will bring it down on > > top of > > you, your tent, your car, your neighbors car, etc. > > > > > > > > One thing to remember about > > wind loading is that the resultant force applied increases > > exponentially as the > > wind speed increases. That means doubling the wind speed causes a FOUR > > TIMES > > INCREASE in applied loading. So, just because your shade stood up to > > last > > night’s whiteout does not mean it will hold up today. The three keys > > to keeping > > your shade up at Burning Man are > > > > Solid and redundant guy linesSolid ground anchor pointsDaily/ > > (sometimes)hourly maintenance of the > > entire system > > > > > > > > > > > > SOLID AND REDUNDANT GUY > > LINES. > > > > This is the main way I see > > people slacking on their shade so I’m going to tackle it first. > > > > Let’s take a look at a > > simple 4 legged square shade structure. Please excuse my crappy > > drawing, I have > > other talents. > > > > > > > > This is a very common type > > of shade canopy used all over the place and can range from a simple > > $30 canopy > > from a camping store, up to more expensive ‘easy-up’s’, and on up to > > the Costco > > garage carports or even larger structures. Whatever type the object > > is, they all react > > pretty much the same to wind loading. That is to say, they give or > > flex, or > > bend slightly as the load is applied. When the force lightens up, the > > structure > > returns to its original shape/position. Kind of. This back and forth > > motion is > > often what starts the failure of the object and is known as an > > oscillation. (think: “wonka wonka wonka” > > action in the wind). We’ve all seen this happening. Your goal when > > tying > > anything down is to prevent this oscillation from occurring. > > > > What’s happening is that the > > oscillation is loosening the tie downs, and the internal joints of the > > structure itself in many cases. Once that happens it’s usually only a > > matter of > > time before the structure gets bent or destroyed for the wind cares > > not. > > > > > > > > Ok, so we need to tie this object > > down and prevent oscillation from happening? We all get that, but the > > confusion > > often comes from HOW to tie it down and in what configuration? You > > have many > > choices and they all have their strengths and weaknesses. > > > > > > > > The strongest way to tie a > > square object like this shade structure down would be with an 8 point > > guy plan. > > In this view you are looking straight down from above. > > > > > > > > In this scenario 8 > > individual guy lines are run out from the top corners of the shade > > structure to > > presumably secure stakes of some sort in the ground. More on that > > later. This > > is the strongest but also most labor intensive of the way to guy this > > shade > > canopy down. Pros: Strongest and most wind proof. Cons: Labor/ > > materials intensive, > > takes more time, uses a lot of real estate > > > > > > > > Quite often I see people > > cutting corners on this design and just going with a 4 point tie down > > plan as > > seen below. > > > > 4 points, while faster to > > set up and maintain has one serious design flaw; if one of the guys on > > the upwind > > side of the structure fails or comes loose, that corner of the object > > is then > > subjected to a prying action (Torsional loading) and the danger of a > > failure of > > the structure increases. Inevitably, this failure will occur A: when > > you’re out > > on the playa and not home to stop it. Or B: when you’re just barely > > asleep in > > your tent under it. 4 point Pros: quicker to set up, uses less real > > estate than > > 8 point. Cons: less redundancy, higher likelihood of failure if one of > > the > > lines comes loose. > > > > > > > > Another option is one of “Internal > > Guying”, and though I don’t see it used very often, it’s actually a > > very solid > > and elegant way of securing your shade structure against wind loading > > and > > oscillations. Take a close look at the center camp structure when > > you’re out > > there, it is internally AND externally guyed down. That sucka isn’t > > moving. Internal > > guying creates an X pattern on each face, from the corner anchors that > > the legs > > are tied into (you ARE staking the legs themselves down too, aren’t > > you?) > > > > > > > > There are two main > > advantages of the internal guy system. First is the redundancy of all > > of the > > ties working together to tightly hold the structure down, and second > > that it > > takes up no more real estate that the shade structure itself. This is > > of > > particular importance in crowded theme camps where tent camping space > > is at a > > premium or when cars are parked close by. > > > > Internal guying Pros: takes > > up less real estate, less materials: 4 points hold the entire > > structure down. > > Cons: corner stakes need to be 100% bomb proof, this usually means > > going to > > larger and harder to remove stakes or rebar (see below). > > > > > > > > A final word on guy lines is > > the angle that they come off the structure at. Ultimately you’d want > > them at a > > very shallow angle spreading way out to the sides to prevent Torsional > > loading > > and oscillations. But again the real estate this consumes would be > > huge. So > > most of us end up with somewhere around a 45 degree angle, which is > > adequate. > > Just keep in mind that LESS than 45 degree angle (like almost straight > > down) is > > increasingly useless. All this does is apply downward pull (load) on > > the > > structure but it does nothing to prevent oscillations; the great > > destroyer of > > shade at Burning Man. The rule is; 45 degrees outward or greater on > > the > > guy lines. > > > > > > > > > > > > > > > > SOLID GROUND ANCHOR POINTS. > > > > By far the most secure > > anchor point you can create is about 2 feet of rebar pounded down > > almost flush > > with the playa and leaning outward against the direction of pull. > > Rebar is a > > pain in the ass to remove however at the end of the week in many cases > > it’s > > almost TOO solid of an anchor. The dozens of pieces left stranded on > > the BRC > > site every year are a testament to this. To be honest, I’ve tied a $30 > > shade > > canopy down with 10 inch yellow plastic tent stakes and had no > > problems at all > > the entire week. (see maintenance, below) Whatever stakes you use, > > they’ve got > > to be bomb proof. If one of your key stakes comes out during the > > whiteout > > you’re fucked. The wheel of your car or even a trailer hitch can be a > > great tie > > down point too. > > > > The three main things to > > consider about ground anchors are > > > > SOLIDEasy to remove on load outMarkeable (water bottles, tennis balls, > > pool > > noodle cut into chunks) or driven flush with the playa surface to > > prevent > > injury. > > > > > > > > MAINTENANCE: > > > > No matter what guy system > > you end up with or what ground anchors they are tied to, it all means > > nothing > > without regular maintenance. This one single thing is the second > > greatest > > source of destroyed shade at Burning Man after improper guying to > > begin with. Read > > this again: MAINTENANCE IS THE KEY TO KEEPING SHADE STANDING > > > > > > > > There’s a lot going on out > > here and you’re sleep deprived, dehydrated, impaired, distracted, or > > otherwise > > not paying attention to little stuff like what’s going on with the guy > > system > > on your shade. Don’t make this mistake because it means giving the > > wind time to > > work on and destroy your shade. > > > > > > > > Slack lines mean > > oscillation, oscillation means failure and collapse. > > > > > > > > Each and every day, > > sometimes several times a day, you MUST walk around and inspect all of > > your guy > > lines. If they’re loose then retighten them and inspect the ground > > anchors too. > > Are they coming up out of the ground? Has the entire structure moved/ > > slid > > sideways causing slack in some of the lines? Maybe the basic geometry > > of the > > entire structure has changed in some way. Physically LOOK at all the > > pieces > > that make up your shade; are they bending or distorting? Did one of > > them slip > > out of its connections? This is all basic common sense stuff, but > > unfortunately > > 4 days into Burning Man, common sense can be in short supply. How > > important is > > your shade to you? To me it’s right up there behind water so I spend a > > lot of > > time making sure my shade will hold up to Godzilla on meth, in the > > whiteout, in > > the dark. > > > > > > > > TIE LINE MATERIALS. Almost > > ANY decent string will work for simple shade guy lines. You don’t need > > one > > million pound test Kevlar/spectra line. > > Basic parachute cord or even clothes line available everywhere will > > work > > just great. I like white because it’s easier to see at night. I have > > seen 1 > > inch webbing ratchet straps used as well. They tend to oscillate in > > their own > > unique way in the wind, but they are easy and fast to re tighten and > > they are > > cheap. > > > > > > > > KNOTS > > > > Here are two knots that you > > MUST learn when tying shit down. > > > > The Truckers Hitch allows > > you to adjust the tension on a line while it’s under tension. That > > means you > > can re tighten your guy lines without completely undoing them. > > > > http://www.animated knots.com/ truckers/ index.php > > > > > > > > and the tossed of ‘thrown’ > > clove hitch. This knot allows you to precisely tension and set a line > > around a > > stake, pole, or a carabineer. Tied as a ‘slip version’ it is a very > > quick and > > secure way to fix the end of a line. > > > > http://www.gorp. com/hiking- guide/travel- ta-hiking- sidwcmdev_ > > 056181.html > > > > > > > > Both of these knots mainly > > work at the bottom or anchor end of the guy line. Up top at the canopy > > all that > > matters is that the knot stays tied and can be untied on load out so > > I’m not so > > picky about what knot you use up there. “If you can’t tie a knot, tie > > a lot!” > > > > > > > > FLAG YOUR GUY LINES!! > > Getting “clothes lined” at 3 in the morning going out for a pee sucks. > > Running > > into a guy line on your bike at full speed could cause serious injury. > > Our eyes > > are tuned to movement so tie little pieces of cloth, tape, or > > something that > > will flap in the breeze to your guy lines so that you and others can > > see and > > notice them both day and night. > > > > SET UP YOUR SHADE AT HOME A > > COUPLE OF TIMES. > > > > One of the biggest mistakes > > I’ve seen newbies make is buying a brand new shade canopy or tent and > > taking it > > out to the Black Rock for it’s first time set up. Don’t do that. Even > > if you > > have to go over to a local park and set it up a few times, get > > familiar with > > your shade BEFORE you leave home. Often time the factory stakes are > > completely > > useless. There’s not enough or even any tie line included, or other > > problems. > > (“pole A goes into pole B, um…. WTF is Pole B?!” get your stuff down > > to a > > system and include spare everything too. If you take an hour or two in > > advance > > of the event figuring this out you won’t have to do it drunk, in the > > white out, > > at night, alone. Hear that thumping sound? That’s Godzilla, he’s on a > > bender > > again….. > > > > > > > > Everything in this document > > is basic common sense stuff. > > > > Thanks for reading have a > > safe trip! > > > > > > > > > > > -- > > You received this message because you are subscribed to the Google Groups > "hexayurt" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > [email protected]<hexayurt%[email protected]> > . > > For more options, visit this group at > http://groups.google.com/group/hexayurt?hl=en. > > > > -- > You received this message because you are subscribed to the Google Groups > "hexayurt" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<hexayurt%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/hexayurt?hl=en. > -- You received this message because you are subscribed to the Google Groups "hexayurt" group. 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