On Sat, 22 Jan 2005 13:01:55 -0500, Courtney Thomas
wrote:

What sized sheets and halyards are recommended for a boat of about
10tons/40' long ?

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Using hi-tech material like Spectra (especially worthwhile for
halyards), 5/16 for halyards, 7/16 or 1/2 inch for sheets and guys.

Otherwise you'll need wire halyards at about 5/32 or 3/16, with sheets
and guys at 5/8 dacron.