The vang
The vang on our
Hanse 370e from 28th May 2009 is a Sparcraft PERFORMANCE range and needs
quite a lot force as it is designed to hold 700 kg according to the
specifications. This means that if you are not built like Popey the
Sailor you have to work hard in order to use the vang in its full range.
Below you will find a solution that we saw on SY Hutschlange (a Hanse from
2006) which we later on improved so the purchase is now even better. It
is now possible to pull down the vang by only using forece of one
hand...well almost!
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Original set up by the
shipyard.
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1. The top blocks. |
2. The
lower blocks.
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3. The
original set up has a 4:1 purchase.
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The first solution with
single blocks.
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1. A single block on the
top end of the vang has been added. |
2. A single block has been
added on the lower end of the vang.
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3. This set up gives you
12:1 purchase.
When you
have 2 block systems in what I would call seriel connection you must
multiply the 2 gear ratios to get the combined ratio. So in this case
you have the original 4:1 and your addition is 3:1 (4 x 3= 12). The
combined ratio is 12:1
Thanks
to Thomas Hansen with Hanse 370 "Sleipner" from Thurø who have written the explanation.
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The second solution
with fiddle blocks.
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1. A fiddle block with a
becket has been added on the top end.
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2. A fiddle block without
a becket has been added to the lower end. |
3. This
set up gives you 20:1 purchase.
Original
ratio: 4:1, new addition: 5:1 (5 x 4 = 20). The combined ratio is 20:1
Thanks
to Thomas Hansen with Hanse 370 "Sleipner" from Thurø who have written the explanation.
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4. Just a different angle
of the new set up. |
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