Westsail Owners Alliance - Post: "Pressure On Sheets"
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Post: "Pressure On Sheets"

12,268 posts on 2,444 threads   •   From Mar 07, 2004 - Jan 08, 2012


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- Archived Message from Inactive Forum -

Dave King

Ahoy Terry, Grab a pencil. Your guestimate is quite accurate. At 15K the TOTAL pressure on a 149 sq.ft. staysail is about 134#. The clew, representing 1/3 of this, is 44#. At 30K the pressures are 536# and 177#. At 50K, approaching the maximum you'd ever use this sail, the pressures hit 1490# total and 492# on the clew.
These pressures are static loads only and must be adjusted for the "jerk factor". A doubling of the load on the clew can easily occur during a flogging episode. This raises the pressures at the clew to 88#, 354#, and 984# respectively.
To complicate things a bit, If you have a staysail traveller with a 2 to one purchase on a single sheet, like Saraband has, then the above clew pressures are cut in half approximately. That would then equal the original 44# (plus friction in the blocks), 177#, and 492#.
I hope this has been of some help. Good luck on the re-do. Dave

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