What size/strength halyard ? - SailNet Community
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post #1 of 20 Old 06-28-2008 Thread Starter
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What size/strength halyard ?

I am in the process of replacing my wire halyard on my mainsail and had thought of using all rope instead. I was wondering what size though and what breaking strain ?
I was thinking 10mm 16 plait double braid polyester which has a BS of 2100kg. Will that be enough for a 36 Sloop ?
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post #2 of 20 Old 06-28-2008
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I don't think breaking strength with any modern line for a min halyard is much of a concern, trhat line sounds more than strong enough, be sure it is low stretch also. 3/8 is an OK size for the hand, be sure your blocks and sheaves will treat the line right.

I persoanlly like to discuss line selection questionswith the staff at Layline 2008 Cordage Line-Up they really know their rope.

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Thanks sailingfool
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If you've currently got a wire halyard, you may have to replace the sheave at the head of your mast before going to rope.

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As a general rigging rule is 3/8 up to 32 feet of boat length. 1/2 inch for 32 feet and over.
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Abrasion resistence is as important as outright strength.

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post #7 of 20 Old 06-28-2008
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Depends on what rope you're using too. 10 mm (about 3/8") T-900 has a breaking strength of 11,800 lbs.... which is more than adequate for most boats larger than 32'.

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As a general rigging rule is 3/8 up to 32 feet of boat length. 1/2 inch for 32 feet and over.

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Quote:
Originally Posted by bubb2 View Post
As a general rigging rule is 3/8 up to 32 feet of boat length. 1/2 inch for 32 feet and over.
Bubb2,

are you thinking of jib sheets as opposed to mainhalyard?? there arn't too many halyard sheaves and blocks that will take line that large...1/2 is way to big for mid-size boats, i don't know what goes on a maxi...

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post #9 of 20 Old 06-28-2008 Thread Starter
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I went up the mast and had a look and the pulley is rounded, exactly like all the others at deck level. The halyard I have at the moment is wire to rope, not wire all the way (do they exist, I couldn't see a wire going around a winch too well).

In Australia here T900 means nothing to me and isn't listed in any boat supply cat. Is it the same as Spectra which in 10mm has a BS of 4950kg but is a whopping $7p/m ?
I think i'll go with the 16 braid at 10mm at a more reasonable $2.50p/m.
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Betty-

T-900 is a New England Ropes product, NEROPES.com, and yes, it is basically a Spectra line...but not quite that expensive, at least where I'm getting it.

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