Masthead Sheave on LF38

[Landfall 38]

Does anyone know where I can find the masthead sheaves for my lf38. The current set up has two sheaves, one on each side of the forestay. One is used for the spinnaker and the other is used for the head sail. I notice that there is a space between them that can accept another sheave. I would like to add that one in so that the head sail is lifted from the center, leaving me the two outer sheaves for the spinnaker. My boat uses the wire/rope halyards thus the sheave needs to be able to accommodate both.

Any information our suppliers would be appreciated.

Thanks,
Jason
LF38
Winnipeg

[svHyLyte]

Originally Posted by Landfall 38

Does anyone know where I can find the masthead sheaves for my lf38. The current set up has two sheaves, one on each side of the forestay. One is used for the spinnaker and the other is used for the head sail. I notice that there is a space between them that can accept another sheave. I would like to add that one in so that the head sail is lifted from the center, leaving me the two outer sheaves for the spinnaker. My boat uses the wire/rope halyards thus the sheave needs to be able to accommodate both.

Any information our suppliers would be appreciated.

Thanks,
Jason
LF38
Winnipeg

Jason--

If you know the sheave diameters, widths and pin sizes, you can contact Garhaurer Marine. They have excellent sheaves at very reasonable prices. You might also try RigRite.


FWIW...

[Stumble]

For any sheave work I always go to ZephyrWorks. It's all they do, and at really good prices. They have a lot of sizes available off the shelf, but their custom work isn't bad either (abt $35 for new 2" sheaves).

[Landfall 38]

Thanks for the feedback. I am going to try and remove the existing ones to get exact measurements. I hope they can custom make double stepped sheaves that can accommodate both wire and rope. I will make some calls and find out

Thanks again

[Stumble]

I don't think you can use wire on Delrin sheaves but I may be mistaken. Frankly it has been so long since I have seen a wire halyard I can't envision it's going to be easy to find.

I am curious why you would still use them? Litterly everyone I know who ever had wire halyards had switched to rope.

[Barney Post]

If you figure out the exact manufacturer and section for your mast you can usually find the exact hardware used when new and no retrofitting.
The Rig Rite web site has some handy charts for a number of well known brands.

[UNCIVILIZED]

If you can't find one that's made specifically for spliced, wire to rope halyards, there are a couple of other options.
- One would be to get a couple of them, custom turned on a lathe, & then anodized.
- And 2, you can run such a halyard on a metal sheave with a rope profile. It'll just eat up the finish on the sheave/scratch it up a lot. So that you won't be able to leave the rope on the sheave when it's under load. As it'll chew it up/cause it's early demise.


Though you could add some extra jacket onto the halyard's cover, if the sheave is wide enough to accept it. Say, something like a Spectra chafe sleeve.
But even with that, it's far from ideal.


Run through the "yellow pages" of hardware manufacturers, & used gear chandleries, & you'll find what you need, given some phone calls. Especially as non US based firms tend to carry some of the older style gear. As guys keep their gear & boats running, where as in the US, things just get replaced with new.

[UNCIVILIZED]

A Third, & probably the best option, which just came to mind, is this.
Since it sounds as if you're adding a 3rd (center) halyard, exclusively for the jib anyway. Then why not just get a sheave designed for a purely rope halyard, & hoist your jib on such?

That way, you simplify your rigging. And also, can skip all of this searching for an old school sheave. Plus, in the long run, an all rope halyard is a better bet anyway. It'll last longer, it's lower stretch, & it won't abrade; your rigging, your sheaves, nor tear your sails, should they happen to "kiss" it.

Still, if you're stuck on the idea of wire/rope sheaves, Ronstan, I think, still makes some http://www.ronstan.us/marine5/produc...op.asp#sheaves

[Landfall 38]

A Third, & probably the best option, which just came to mind, is this.
Since it sounds as if you're adding a 3rd (center) halyard, exclusively for the jib anyway. Then why not just get a sheave designed for a purely rope halyard, & hoist your jib on such?

That way, you simplify your rigging. And also, can skip all of this searching for an old school sheave. Plus, in the long run, an all rope halyard is a better bet anyway. It'll last longer, it's lower stretch, & it won't abrade; your rigging, your sheaves, nor tear your sails, should they happen to "kiss" it.


Thanks everyone for your help, I definitely have a direction for fixing this problem. I like uncivilized's suggestion of making the jib halyard a rope only and going with a rope sheave. Sometimes all it takes to fix a problem is to have someone else look at it. Glad to be part of such a great community.

Regards,
Jason

[Tessellate]

Or you could just mount a block, externally, on the masthead for the spinnaker. That's how my spinnaker is run. There's already two ~1/2" holes drilled in the fwd edge of the masthead unit.

A block is relatively cheap and easy to maintain/replace, and my guess is another advantage is that they're usually very low friction compared to the friction of a sheave - and low friction is good for quickly hoisting a spinnaker. The only downside is you may not want to use that halyard for climbing the mast then; but you still have your main halyard for that. (or the jib halyard on the sheave, but with a furling jib I generally don't use that because it'd require dropping the genoa).

[notiesbob]

If these are your dimensions I have an OEM sheave. It is the spare forward sheave from our mast and we just bought new set for rope only from Zephyrwerks - The Sheave Factory. Klacko Spars in Oakville 905-825-0015(they used to make the C&C masts) quoted $120CDN each in original machined anodized aluminum with 6 week turn around. We opted for full set from Zephyr. The never used one is on the right in the photos.

Halyard diameter - 3/8" all rope no wire
W 9/16"
OD 3-7/16"
ID 7/16"
Depth 1/4" to bottom of wire groove in original sheave

[Siberianhusky]

Try holland marine in toronto, bought out all the old C&C stock. Pretty much the go to guys for older C&C stuff. Great selection of harder to find hardware in the catalog.

Holland Marine Products