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Add drawing and more words to bivirigging guide.

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Wookey
2015-06-30 17:09:17 +01:00
parent 74e4ed0cd7
commit c759239e63
2 changed files with 41 additions and 20 deletions
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handbook/bivirig.html
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@@ -38,6 +38,8 @@ up, because that works for all three sections. So the
gear/stove/animal-hole wall. The 'back' is the top end of the bridge.
The 'front' is the main entrance.</p>
<img src="bivirig.svg" alt="Drawing of tarp layout">
<h2>Water tarp</h2>
<p>Use a long/thin (2x5m) waterproof 'logpile' tarp. It is hung
@@ -49,11 +51,12 @@ onto the 'water platform' (not into the food boxes).</p>
<p>It's easiest to approximately tie the tarp to the side ropes with
adjustable knots, then put the ropes in place, adjusting as you
go. The outer line ends up too high to adjust once properly in
place.</p>
place. Adjust it to catch as much of the water falling through the
hole as possible, and slope gently, but consistently downwards.</p>
<p>In past years we have hung the funnel in the hole. This is a faff
and misses a lot of water. Just hang it below the end of the tarp where
it will get nearly all the water and is much easier to hang.</p>
it will get nearly all the water and is much easier to hang/adjust/unclog.</p>
<h2>Main roof tarp</h2>
@@ -71,10 +74,17 @@ that it goes all the way to the right wall, partly 'underneath', and
the left hand edge is about in line with the steps up the middle. The back
edge lines up with where the roof rises at the back entrance.</p>
<p>Start by rigging
<p>So start by opening it out to full width on the wide central
bed-shelf. and pulling the RH edge </p>
bed-shelf. and pulling the RH edge close to the wall. Sequencing the ropes is a bit tricky, you need the tarp vaguely in place, then install the two main ropes to lift it up. Finalise th tarp position and tension it. </p>
<p>Once the tarp is somewhat spread out, rigging the ends of the two
main ropes - one across the front and one across the middle (passing
under the tarp). These are the two that take high loads. The rear
major rope has no real load - it just keeps things neat. Now tension
them to lift the tarp up and ensure it is neatly spread. The middle
rope attaches to the roof bolt just at the LH edge of the tarp. This
needs someone very tall, or sitting on shoulders, or something devious
with bivi string to pull it tight.</p>
<p></p>