You know, after re-reading that, I think I get what you mean by "K". The
idea here is sort of a mix of the two concepts. You get a K, by doing it
the BFT way.
For terminology, let's refer to a single strip of material adhered to the
space between two triangles, on one side, will be referred to as a "join".
If you were to put another strip of vinyl on the opposite side of this
join, you would create a "hinge". 1 sided = join, 2 sided = hinge. Where
you have vinyl glued to the foam edge, you have a "gutter". Where the vinyl
is only glued to the board, you have a "flat".
It folds like an accordion. From the outside, you would see a gutter, then
a flat, then a gutter, then a flat...... This is important when trying to
consider which way water will flow. Where will your gutters go and how will
you make sure water doesn't follow them directly into your dome? I'm
thinking of putting gutters on the top corners, with some overhang (like a
spout). For every 'gutter', the opposite join will be flat. For every flat
join, the opposite side will be a gutter. The great thing here is that
instead of having to sew the vinyl together length wise, the fact that the
boards won't sit exactly next together when you join them, there will be
about 5mm gap. When you create a hinge with vinyl on the opposite side, the
center of this strip will just become glued to the vinyl on the opposite
side.
This is with a double miter:
_______ _______
\ /
________\_/________
This is with a single miter:
_______ _______
\ |
________\_|________
That flat bit there in the middle will be where your vinyl will end up
glued together. The top part is the 'gutter' join, and the bottom is the
'flat' join. These alternate to make it fold up. Ideally, you'll end up
with just one "flat" join to do when you get to the playa (plus the quads
to eachother, then to the equilateral triangles, and the top square), and
that can be done with BFT or whatever since you'll end up having to cut it
in order to fold it all back up again. This would be where a zipper and
flap would be another more permanent solution.
Hell, the vinyl and cement is so strong. I've thought about putting a small
pipe in certain places to make a "pull this" type of setup. You pull a thin
nylon rope and it unfolds the entire dome. Maybe next year ;-p
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