I have a 3/8 main sheet on Sirocco.3/8 has a breaking strength of about 3500lbs to 7,000lbs. depending what you use.More than enough for a 160 square foot main sail.All my control blocks are Schaefer #5 series with a breaking strenght of 1750lbs and can go up to 1/2 I just never saw any reason to go larger.I have 1/2 sheets on a 250 square foot 165 genoa,I`m replacing these sheets this year and will probably down size,dont want all the weight 1/2 lines are heavy, or want the extra expense.All of these older boats came with over sized lines.My buddies 34 Crealock has a 1/2 inch main sheet.
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