Join Date: Mar 2006
Location: New England
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Basically, a simple way to tell what the leverage of a block and tackle setup is, is to count the number of times the line is attached to the moving part of the block and tackle.
On a basic mainsheet, with a triple block at the boom and a triple block with becket and camcleat at the traveler, you have a six-to-one purchase. There are SIX lines coming off the upper block.
On my new mainsheet, which is a double-speed mainsheet, it has a double fiddle block at the top and a double fiddle block and a single block at the top with a double camcleat setup...if you pull one of the two lines, you get an 8:1 purchase, and if you pull on both lines, you have a 4:1 purchase.
If you count the number of lines coming off the double fiddle block, you'd see that the line is attached to it EIGHT TIMES.
BTW, Nemier is wrong... I have yet to see any marine blocks that have the SWL or BL stamped or indicated on the block or block cheek plates.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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