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Mast head sheaves

Hello:

I am saving a Islander 28 from the scrap heap and the current need is a source for replacement aluminium masthead wire/rope sheave 3" OD, 2.5" OD for bottom of the wire track with a bronze bushing 3/8" ID

Thanks for your help

David Richardson
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Re: Mast head sheaves

Probably $50+ for Aluminum half that for plastic (some work with wire) but most people don't use wire anymore.
Sheaves - by Outside Diameter

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Re: Mast head sheaves

Quote:
Originally Posted by [email protected] View Post
Hello:

I am saving a Islander 28 from the scrap heap and the current need is a source for replacement aluminium masthead wire/rope sheave 3" OD, 2.5" OD for bottom of the wire track with a bronze bushing 3/8" ID

Thanks for your help

David Richardson
Good project. My first keelboat was an Islander 28 ( Island Majic)
There were very few Islanders on the Chessie.


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Re: Mast head sheaves

https://www.zephyrwerks.com/Sizing.html

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Re: Mast head sheaves

While we are here, I'm replacing the original plastic acetyl sheaves and Aluminum replacements are available. The link OB posted makes the case for plastic as non-corroding, others say Aluminum for long term strength. What do you think ?

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Re: Mast head sheaves

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Originally Posted by capttb View Post
While we are here, I'm replacing the original plastic acetyl sheaves and Aluminum replacements are available. The link OB posted makes the case for plastic as non-corroding, others say Aluminum for long term strength. What do you think ?
The answer to that depends on where you are and what kind of halyards you plan to use. High quality plastic sheaves last longer in saltwater but will UV degrade over time. I replaced mine with plastic in 2001 and they are still there and in good shape. In freshwater, aluminum will last a lot longer.

Regarding the original post, under no circumstances would I continue to use wire to rope halyards. Wire-rope halyard was an unreliable technology when new, your existing halyards are probably well past their "use-by date", and would be a silly technology to use today. On a boat like a the Islander Bahama 28, I would replace the halyards with something like 8mm (5/16") New Egland Rope VPC and not install wire-rope style sheeves, since that will chew up the new halyards over time. (Stretch being the controlling factor for halyards), you could also use 7/16" Staset X to achieve a similar stretch but that would be a more expensive and possibly shorter lived option.

Jeff
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Re: Mast head sheaves

Ditch the wire and get some Sta-Set New England line , and make these work .
https://www.duckworks.com/product-p/rl-e-5-8.htm

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Re: Mast head sheaves

Garhauer has a number of sheaves for mastheads. Believe they will also do custom work if needed. Great people to deal with. http://garhauermarine.com/catalog.cfm

Ditch the wire halyards. 5/16" exotic cored/Dacron sheathed line is not that expensive and lower stretch than the wire you'll be replacing.

Looks like you had to spend more time cleaning off the flora than Islander did to build the boat. Good luck on the rehab, the I28s are sweet boats that I would have bought if I could have found a good one.
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Re: Mast head sheaves

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Originally Posted by Markwesti View Post
Ditch the wire and get some Sta-Set New England line , and make these work .
https://www.duckworks.com/product-p/rl-e-5-8.htm
Its actually cheaper these days to use one of the blended higher tech lines. That is if we agree that stretch is critical for halyards, especially on cruisers, and generally controls the size of the line to use. So for the OP's boat, it requires 1/2" dia Staset at $1.34 a foot to almost equal the stretch of 7/16" Staset X at $1.79 a foot, which still has slightly more stretch than 8mm VPC at $1.29 a foot and which has less stretch than the original wire halyard and will be cheaper and last longer than the wire as well.

Jeff


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Re: Mast head sheaves

I replaced the ones on my masthead with TI:

Expensive, but should last longer than anything else available. The ones I bought were pricey also because they have roller bearings instead of bushings.

If a thing is worth doing, it's worth over doing.
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