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  #11  
Old 05-29-2012
tap tap is offline
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Re: Adding an adjustable backstay without adding a split backstay

You're going to have to cut and shorten your backstay to make room for the purchase, so while you're at it you might want to consider changing to a dyneema backstay. Look into what it costs to get a new fitting for your wire and compare that to length of appropriate strength amsteel. You might be able to get a new lightweight backstay for close to the same price.

With a dyneema backstay, for the top block of the cascade system, you could use one of these. Antal-Low-Friction-Rings You splice the backstay around the outside of the ring, then run the purchase through the center. The rings have a high load for $$ vs a block. And if it broke, the purchase and backstay are still connected whereas a block breaking would disconnect the two.

If you want 12:1 or more, consider using multiple cascades instead of a bulky 6:1 with two triple blocks. Something like this, which is a 16:1 system. The two cascade blocks could be rings.

Last edited by tap; 05-29-2012 at 04:05 PM.
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Old 05-29-2012
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Re: Adding an adjustable backstay without adding a split backstay

Maybe the system on the Sigma 33 OOD: Bekijk bootfoto's - YachtWorld.com is useful. Because of the lever and the 4 fold block and tackle there was some good purchase. Photo 11.
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