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post #6 of Old 03-26-2011
KeelHaulin's Avatar
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I think the wind load estimate is low. It's not unreasonable to sail without reefing the main in 20 kts true which would be higher in apparent wind. In addition there is loading in a gust or a round down. Running the calculator with your main dimensions, nominal length from the end of the boom of 3' and a max wind load of 30 kts (not unreasonable to get a +10 kt gust), the total load on the boom is 1750 lbs. That means the load on the traveler block is 1750 and the load on each of thee blocks on the boom will be 600 lbs. The 57mm single block is rated 792 lbs SWL, which should be OK (use at your own risk), but the double with becket for the traveler is too small, rated at 1584 lbs. I would use a fiddle block on the traveler, so look for one rated higher than 2000 lbs.
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