Designing block and tackle systems - Page 2 - SailNet Community
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post #11 of 12 Old 06-06-2011
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Faster has some good stuff in his post. Hopefully I can add something to the discussion.

I put a lot of fundamentals in this page:
Block Systems and that might help.

This system is 48:1:
http://www.harken.com/uk/img/Beneteau-lg.jpg

I think it is exactly what you are looking for. (click the link for a larger image)

You can see that the little blue bulb would jam in the cleat if the control line was released which would prevent the mast from going free. You can also see that the control lines run port and starboard.
The system is 2:1 x 2:1 x 2:1 x 6:1 = 48:1 The write up is here Optimise your cruiser / Racer - Part 2: Backstay and vang

Allen

Last edited by allene222; 06-06-2011 at 09:38 PM. Reason: corrected purchase and added link
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post #12 of 12 Old 06-06-2011
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If you were to rig the system 2:1 x 2:1 x 2:1 x 3:1 you'd get 24:1 and the length of the control line would only be half as long as it would be for the 48:1 system. The control line has to be big enough to handle; 5/16" or bigger.
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