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  #1  
Old 06-04-2009
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Changing the halyard from wire to rope

Hi there,

I'm new to this fourm and I have a question, but first some background. We sail out of Whitby, ON on an H28 Ketch rig. She has a mahogany hull, spruce masts and a furling headsail.

Our wire halyards have all but worn out and we've decided to switch to rope. The sheaves will take a maximum of 3/16"

It was suggested to us that we go with Spectra 12 strand because it's low stretch and high strength. However it's very expensive, approx. $1.30/ft. It has a Minimum Tensile Strength of 3600 lbs.

Novabraid Polyspec has been made as a less expensive alternative but I want to make sure it's strong enough. It has a similar elongation at break strength but only a Minimum Tensile Strength of approx. 1800 lbs.

Does anyone know if this is suitable as an alternative?

Thanking you in advance,
Bobby

Seahorse - H28
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Old 06-04-2009
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You might be able to change out your sheeves, 3/16" line is very small. If you go with Spectra it will be strong enough but will be hard to handle. 5/16" is about as small as I would want to use.

If you cannot change out your sheeves you can go with "tapered" halyards. That is one where you have a high tech core like spectra and have a cover on it part way up. This allows a larger line at the deck where you are handling it and the 3/16" core will go though the sheeves.

Gary
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Old 06-04-2009
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Before you commit to going with all rope, you really need to do a few things. First, check the halyard sheaves and see if they have a v-shaped or u-shaped groove. If the former, they'll need to be replaced to deal with a rope halyard or they'll chafe it unnecessarily and cause it to wear prematurely. Also, you'll want to check the exit slots for any damage caused by the wire halyard, and repair it so that it doesn't chafe the new rope halyards.

I'd point out that the Novabraid Polyspec is probably a bit weak to replace the halyard, since it has an SWL of about 300 lbs, vs. 600 lbs. for the spectra 12 strand. Shop around, you can get comparable rope to the Spectra 12 strand for less I'm pretty sure.

BTW, the 3/16 stainless wire rope has a tensile strength of about 3600 lbs.. which is a good match to the 12-strand spectra.

If you can, as gary points out, go to a larger sheave, so that you can use a larger rope that will be easier on your hands. Or you can use a larger diameter spectra or dyneema cored line, like T-900 and then remove the outer jacket for the section that is in the mast and goes through the masthead sheave.
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Old 06-04-2009
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You should also check out this similar thread.

Quote:
Originally Posted by sailingdog View Post
Sheaves used for rope generally have a u-shaped profile to the groove, while sheaves for wire generally have a v-shaped profile to the groove. While you can sometimes use v-shaped wire sheaves on rope, it will tend to cause the rope to wear through faster than if you had the proper sheaves.
You should also inspect your sheaves and boxes for scores, rough spots, and sharp edges. Any of these will damage your new rope halyards.

When sizing your halyard using Novabraid Polyspec you need to go by core diameter, outside diameter. The price compared to Spec-12 will be comparable.
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Old 06-04-2009
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Thanks for all your great advice so far.

I'm not sure if the sheave is v or u shaped as she is in ON and I'm currently in BC.

I really don't want to have to take the masts down again to replace the sheaves either. So I'm hoping that I can find a suitable solution, one that will last at least a few years before I have to rethink.

sailingdog, your advice on the Novabraid Polyspec is exactly what I suspected, but I guess I just needed some reassurance. Perhaps we can go with a tapered line to be easier on the hands.

I'll definitely inspect the sheaves for all 3 haylards as well.

Can't wait to get sailing.

Bobby
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Old 06-04-2009
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Quote:
Originally Posted by gimmellsdad View Post
I really don't want to have to take the masts down again to replace the sheaves either. So I'm hoping that I can find a suitable solution, one that will last at least a few years before I have to rethink.
Just go up the mast to change the sheaves. Bring a line with you so a buddy can send up the tools.

Check out amsteel in 3/16th. $0.70 / ft and a min. strength of 2300 kg (4500lbs). Easy to splice, UV resistant cover, but I would definitely put a cover over the working/winch/clutch end. Slippery stuff otherwise.
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Great.....Now I have to research 'how to change the sheaves'
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Old 06-04-2009
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I wouldn't even consider line as small as 3/16 - it's going to be really hard on your hands when raising the sail. Either change the sheaves to something that can handle a 5/16 line or stick with wire.
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Old 06-04-2009
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If you're shopping around for rope, check out these guys Redpoint Ropes Manufacturing

They are in Midland Ontario, not too far from you and their prices are very good. I changed my wire halyards to rope last year and I believe the price was between $0.95/ft - $1.05. Their work is excellent as well.
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Old 06-04-2009
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I am definitely shopping around for rope, I just don't know which size now....lol

I was hoping to find something in BC while I'm working out here and take it back with me. If I can't find a decent savings I'll definitely send this request off to the local marine supply store and give him the business.
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