Upgrading to a 12:1 Adjustable Backstay


As a fractionally rigged boat, the Capri 22 was delivered from the factory with adjustable backstay tension using a split backstay in an 8:1 cascading system.  The main purpose of the adjustable backstay is to flatten and depower the mainsail in stronger winds so the boat will heel less and point better.  The system used the same style 4:1 tackle used for the factory boom vang coupled to a wire that ran through a wire block and then down to a chainplate on the starboard side of the rudder.  Altogether, this formed an 8:1 cascading system.

4:1 tackle using a Harken fiddle block with becket, and a Harken fiddle block with cam-cleat.
Fico (now Ronstan) wire block attached to the backstay leading to the masthead.
The factory 8:1 adjustable backstay worked fine, but I wanted more mechanical advantage.  I upgraded to a 12:1 purchase by changing from the 4:1 tackle to a 6:1 system.  I used a Harken #095 29mm Triple Bullet Block with cam-cleat and becket, a Harken #086 29mm Triple Bullet Block, and 6mm (1/4") New England Ropes Sta-Set line.

Adjustable backstay upgraded to 12:1 purchase.


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