Schaefer Blocks and Line Size - SailNet Community

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  #1  
Old 04-06-2010
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Schaefer Blocks and Line Size

I need help determining what lines I can run through these blocks. These are Schaefer blocks and the sheaves measure about 1 5/8" diameter and 7/16" wide. I'm trying to figure out what size line I can run through these blocks. I also have what I think are the old jib sheets. They are very old and stiff. I assume measuring them wouldn't be a reliable guide as to their nominal diameter.



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Old 04-06-2010
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It would really help if you said what kind of boat you had. I am guessing that the boat is fairly small, say <25' or so, and that those blocks are meant for lines 5/16" in diameter or so. They might accept a 3/8" line, but that's pushing it IMHO.

Generally, when asking questions on hardware, giving more information rather than less is a good idea. I'd also highly recommend you read the POST I have in my signature.

BTW, those would be odd blocks for jib sheets, unless they're located further back on the deck than they appear to be.
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Old 04-06-2010
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Tough crowd tonight. We're working on a 23 footer. The blocks pictured are near the mast. The blocks are the same size all around her. If I knew the exact specs on the blocks I could just get line size info from Shaefer's web site. I'm trying to get an educated guess as to the largest line I could run through these blocks.
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Old 04-07-2010
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Go with 5/16" line... more than that is overkill on a boat that small.
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Old 04-07-2010
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Any other opinions or confirmation that these blocks can handle up to a max line size of 5/16"? Also, if 5/16 is pushing the limit on these blocks would there be some benefit to dropping to 1/4 and using a stronger line?

Last edited by itsme6582; 04-07-2010 at 01:15 PM.
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Old 04-07-2010
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Smaller diameter line is harder on the hands, but presents less windage, and makes the coils of line in the cockpit smaller.
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You said they are for jib sheets? What's the sail area of the jib/genoa? Find out what kind of load you have and think weather or not you'll be able to hold it w/ a 1/4" line. That's getting pretty small for jib sheets. On a "Fun 23", not an issue, on my Merit 25 w/ a #1 up in 18 kts, it's a completely different story.

Do you have winches for the headsail? Do you sail w/o gloves?

Single braids are nice but don't last nearly as long as the double braid.
Sampson Apex
Salsa
Rooster
Mafiola has some good stuff.

All of these are good on grip, lightweight, strong, float, but get chewed up by a winch.

Edit: small line hockles less, has less friction around smaller blocks, is cheaper, etc. Honestly, I wish I used 1/4" on my mainsheet instead of 5/16".
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Old 04-08-2010
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I think we'll go with 5/16 Sta-Set. We've got an experienced eye coming out Saturday to give some direction.
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