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__NOTOC__ Rather than buying a big huge bell tent, we'd thought we'd make our own. As you do. Selecting from *http://www.extremtextil.de/catalog/Fabrics/coated:::21_22.htm<br> *http://www.esvocampingshop.com/nl/tentdoek/ripstop-nylon.html =Design= bell tent - simplified 12 sided design - dodecagon = 12 sides π = pi = 3.14159 ...<br> √ = square root<br> a (side length) = 1.11 m <br> r (inradius (apothem)) = 2.07129 m <br> R (circumradius) = 2.14436 m <br> A (area) = 13.7948 m2 <br> P (perimeter) = 13.32 m <br> x (interior angle) = 150° <br> y (exterior angle) = 30°<br> ==Walls== http://www.extremtextil.de/catalog/Nylon-siliconecoated-40den-90g-sqm-tent-fabric-2nd-choice::1694.html<br> Weight: app. 90 g/sqm<br> Cost: 4.40 EUR<br> height = 0.6m<br> conservative wall = 12 segments<br> segment length = 1.11m<br> area of each segment = 0.6 * 1.11 = 0.66m2<br> cloth = 1.5m = 2 segments wide. 12 segments / 2 = 6segments * 1.11 = 6.6m<br> cost = 6.6m * 4.40 = 29.04 EUR<br> weight = 90* (12 * 0.66) = 712.8g<br> ==Roof== http://www.extremtextil.de/catalog/Nylon-siliconecoated-40den-90g-sqm-tent-fabric-2nd-choice::1694.html<br> Weight: app. 90 g/sqm<br> Cost: 4.40 EUR<br> conservative estimate = 12 segment roof<br> each segment = 1.11 wide<br> isoceles triangle side = lots of fucking pythag<br> side cross section = a2 + b2 = c2 = 2071 (half width of tent) + 1800 (height of roof from wall) = 2743<br> roof segment = a2 + b2 = c2 = 550 (half the length of the side) + 2743 = 2797mm = 2.8m<br> each segment = 1.11 wide, one side of triange = 2.79m<br> total area of segment = 1.52m2<br> need 12 = 18.24m2<br> cloth = 1.5m = 2segments in sq formation = 12 /2 = 6 segments long = 6 * 2.79 = 16.74m long<br> cost: 16.74 * 4.4 = 73.66 EUR<br> weight = 18.24*90 = 1641.6g<br> ==Floor== A (area) = 13.7948 m2 <br> Material - http://www.esvocampingshop.com/nl/tentdoek/ripstop-nylon/nylon-zwart-85-gr-m.html<br> Prijs: € 8,95<br> Breedte: 150 cm<br> Gewicht: 85 gr/m²<br> floor is 4.142m long<br> floor is 4.142m wide<br> <br> cloth@1.5m breadth = 1.5x3 = 4.5 breadth's wide<br> cloth needs to be 4.142*3 long = 12.426m<br> 13m at 8.95 eur = 116.35 EUR<br> weight = 85 * 13 = 1105g<br><br> ==Total== Cost: 29.04 + 73.66 + 116.35 = 219.05<br> Weight: 712.8 + 1641.6 + 1105 = 3458.8g = 3.5kg<br> =Definitions= Den - It is defined as the mass in grams per 9,000 meters.<br> Tex - the mass in grams per 1000 meters.
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