[quote=texastuma]57mm Harken works well. I believe a lot of catamarans used the Harken Big Boat blocks (which were way too big, but they operated better because of the higher load rating). I have only blown up 1 57mm on FrankenKitty mainsheet, but I tend to be harder on equipment and go out in more extreme conditions than most.
The 10:1 is very nice and much easier on the hands, but it has a cost. I built a 12:1 and I can easily trim all day in 20+ knots of wind. But, then again, I tend to go out in more extreme conditions than most.
If you have extra cash to invest on smooth blocks, check out the Harken ceramics... Something to keep in mind is there is a cost to efficiency and good equipment. I believe that if the system is difficult or inconvenient to use, one will not use it as much. Make the boat as easy and simple as possible and go sailing...
Message me if you have any questions...[/quote]
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