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post #72 of Old 09-26-2007 Thread Starter
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Originally Posted by KeelHaulin View Post
With those numbers I get a mainsheet load of 1772 lbs. Since you stated the blocks you selected will fail at 27kts; I assumed that you were talking about the 50mm blocks. The 60mm blocks have a SWL of 1760 lbs; not failure load.
I'm looking at Lewmar's 2006/7 dead tree material catalogue. The 29901624 (60mm fiddle, cam/becket/ratchet) is shown with a 400 kg SWL (882 lbs) and a 800 kg breaking load (1764 lbs).

Originally Posted by KeelHaulin View Post
I'm thinking your biggest consideration among these choices is the amount of leverage that will be needed. I don't think the Admiral wants to develop ape-arms while trimming the main;

Originally Posted by KeelHaulin View Post
and as for the additional sheet you could get a sheet bag to hold the excess when you are sailing upwind.
There's a thought.

Originally Posted by KeelHaulin View Post
(You should check that mount on the boom BTW to be sure it is properly sized, since it was retrofitted in).
Will do.

Originally Posted by KeelHaulin View Post
The 4:1/8:1 that Harken sells is essentially an 8:1 system that has double bitter ends. It works by pulling on both lines to get a 4:1 sheeting speed/force, but you will need 8:1 line length to make the sheet long enough. They also make a 3:1/6:1 but it might be too small for your mainsail. If it were me; I would go with the 4:1/8:1 or a 4:1/16:1 with separate sheets.
Yeah, the 3:1/6:1 is not suitable for the amount of sail we have with mid-boom sheeting.

I'm thinking of the KISS principle, here. I'm thinking maybe just going 6:1 and being done with it.

What do you think of this combo (discovered by The Admiral, I would note):
Harken 2141 57 mm Carbo Triple Ratchet w/Cam, Becket
Harken 2604 BLK-57MM CARBO TRPL

The limits are imposed by the traveler-mounted end, the 2141, and are based on the cam cleat. We'd have an SWL good to 27 kts and a breaking load good to 43 kts, based on Harken's mainsheet loading calculator.

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