TENT - Another newbie with questions...
Tanya Guptill
tguptill at teleport.com
Fri Jan 14 09:45:29 PST 2000
Amicia,
Sometimes it helps with the math if you break down the different shapes. Let's
do the center section first:
---Think of it as two right-angle triangles, with the verical sides butting up
against each other, with the ridgepole being the top of where they meet. To
calculate how much fabric you need for the center section, you use the classic
formula---a squared + b squared=c squared, times two (one for each side). You
said you wanted the center to be 10 wide by 8' deep by 8' high. Convert the
'feet' into 'inches'. That's 120" wide by 96" deep by 96" high. Since there
are two triangles, and each triangle has only half of the size of the depth.
Thus, the formula is 48 squared + 96 squared = the length of each side,
squared. 9216 + 2304 = 11520. The square root of that is the length of one
side of the center section of the tent, or 107.331. For both sides, the length
of fabric would be doubled, or 214.662. Depending on the width of your fabric,
you can use this number to calculate how many yards you need. (12 yards of 60"
fabric, for example). DON"T FORGET TO ADD EXTRA FOR SEAM ALLOWANCES AND
SHRINKAGE (you will want to preshrink any non-synthetic fabric you get--trust me
:) Always round up, and get extra. You will use it for stake loops, door
flaps, hems, seam allowances, mud flaps, etc...
Okay, now let's do the bells. If you think about it, the two bells are each a
half of a cone, that is 8' high and has a diameter of 8'. We can use the same a
squared + b squared = c squared to figure out how long each wedge will need to
be. The numbers will look familiar--4' base of the triangle, 8' height, which
if you plug into the formula you will see you get the same results as
before--each wedge will be about 107.331 in length (let's call it 108"). The
circumfrence of the halved cone can be figured by pi multiplied by the
diameter--96" by pi--about 302". How many wedges you have helped give you each
yardage for the bell. For example, if your yardage is 60" wide, you know that
it will take about 5 wedges to be this large (since you will want each bell to
look the same, you may want to use a different width of wedge, or half each
wedge to have 5 wedges on each side). Use a piece of graph paper to chart how
you are going to lay out your wedges, and remember that if the bell ends are
truly halves of a cone, the bottom edges of the wedges will need to be CURVED.
Also, when you are laying out the cutting diagram, remember that the wedges will
be strongest if laid with the grain of the fabric, not on the bias. This will
'waste' more fabric, but will make a stronger tent.
Whew! Have you had enough math now before breakfast? ;)
Keep us posted--we'd love to see how your project is progressing.
Warm regards,
Mira
Amicia Daelyngridge wrote:
> Greetings all. This is a great list!
>
> Although I have been a closet medievalist for the past few years and making
> my own garb for the last year or so it was just recently I saw the beautiful
> tents that people had made and I fell in love with them. Particularly a
> double bell wedge tent. I've researched many articles, posts and pics on the
> web but I am having problems figuring the pattern dimentions for the
> triangular bell pieces. My geometry isn't what it ought to be (I keep
> kicking myself and saying "oh, so this is when I would ever use geometry in
> life") and I wish I had paid closer attention in school. ;)
>
> The dimensions I wanted to go for were 10'wide x 8' deep x 8' high for the
> center panel section (300 sq ft.).
>
> Then (2) bells 8' high with a 4' radius (50 sq ft. each)
>
> This is the info that I got from the excellent site Medeival Pavilion
> Resources but I just can't seem to work out the bell dimensions. Has anyone
> ever made on of these tents? Any help would be greatly appreciated.
>
> Thank you,
> Amicia
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