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Replacing spin halyard sheave #9397
04/23/10 04:06 PM
04/23/10 04:06 PM
Joined: Oct 2009
Posts: 42
Seattle, WA
gmo Offline OP
Senior Member
gmo  Offline OP
Senior Member
Joined: Oct 2009
Posts: 42
Seattle, WA
I'm looking to replace my spin halyard and sheave. Does anyone know the sheave and pin dimensions? Has anyone tried pulling out the jib box with the mast still up?

Slingshot is a '79, and I'd guess the box is near original. There are two wire jib halyards, and one rope spin halyard.

Thanks,
Grady


Grady Morgan
Slingshot - Hull #112
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Re: Replacing spin halyard sheave [Re: gmo] #9398
04/23/10 09:40 PM
04/23/10 09:40 PM
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody #348 Online content
Past J/30 Class President
Rhapsody #348  Online Content
Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
I had the sheave box off today on Rhapsody. It is not a simple answer because there are multiple sheaves fore and aft. The forward sheaves are the same diameter as the main halyard sheaves. On Rhapsody these are riveted in. The aft sheaves provide separation of the halyards through the center of the mast, hence different sizes and locations. I left the camera on the boat but will post pictures that I took today when I return tomorrow night.

Re: Replacing spin halyard sheave [Re: gmo] #9405
04/24/10 10:03 PM
04/24/10 10:03 PM
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody #348 Online content
Past J/30 Class President
Rhapsody #348  Online Content
Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Look on my blog at this link for the details.

Some teaser photos of the sheave box...
[Linked Image]

[Linked Image]

Re: Replacing spin halyard sheave [Re: gmo] #9429
05/02/10 09:44 PM
05/02/10 09:44 PM
Joined: Oct 2009
Posts: 42
Seattle, WA
gmo Offline OP
Senior Member
gmo  Offline OP
Senior Member
Joined: Oct 2009
Posts: 42
Seattle, WA
Thanks Bill. That is is the same Jib box I have. Rig-rite is now selling part K-11597-1 as a replacement, which they claim is much lighter. Do you have any idea how much yours weights?

With the existing sheaves being riveted in, you can drill the rivets out and replace them with cleaves pins.

Looks like we're pretty much stuck with rig-rite for the replacement sheaves. The sheaves are 31/64" wide, and 1/2" looks to be too fat to fit. I'm probably going to get the Nylatron replacements for the spinnaker and jib halyards.

I had a crazy idea to try and replace it with the stick up, but I've been told this is a bad idea, so I'm going wait until this summer, and do it when I drop the mast to inspect it.


Grady Morgan
Slingshot - Hull #112
Re: Replacing spin halyard sheave [Re: gmo] #9431
05/03/10 06:51 AM
05/03/10 06:51 AM
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody #348 Online content
Past J/30 Class President
Rhapsody #348  Online Content
Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Grady - not sure how much the box weighs, as I wasn't thinking about it when I was working on it. The box is stainless so does have some mass for its size.

If you replace flush rivets with clevis pins you'll need to notch the mast opening to get the box back in.

You could do this with the stick up if once the box is unscrewed, you slide it out, then lower it with the halyards in. You'd also need to work with a Dremel tool to notch the mast. I'd say wait if you can when the mast is down though.

Re: Replacing spin halyard sheave [Re: Rhapsody #348] #9456
05/04/10 09:58 PM
05/04/10 09:58 PM
Joined: May 2007
Posts: 1,234
Newport and Naples
Cap'n Vic Offline
Senior Member
Cap'n Vic  Offline
Senior Member
Joined: May 2007
Posts: 1,234
Newport and Naples
so now as it seems that all J30s came factory issue with the ability for two spin halyards ... how many have actually run the second spin halyard? and what did you use for a exit hole in the mast?

Re: Replacing spin halyard sheave [Re: Cap'n Vic] #9481
05/06/10 04:52 PM
05/06/10 04:52 PM
Joined: Oct 2009
Posts: 42
Seattle, WA
gmo Offline OP
Senior Member
gmo  Offline OP
Senior Member
Joined: Oct 2009
Posts: 42
Seattle, WA
Getting custom cut replacement sheaves here instead: http://zephyrwerks.com/.



Grady Morgan
Slingshot - Hull #112
Re: Replacing spin halyard sheave [Re: gmo] #9482
05/06/10 06:35 PM
05/06/10 06:35 PM
Joined: Apr 2007
Posts: 190
Atlanta, GA, USA
whitedolphin Offline
Senior Member
whitedolphin  Offline
Senior Member
Joined: Apr 2007
Posts: 190
Atlanta, GA, USA
I was not aware of the Rig-Rite K-11597-1 replacement sheave box.

Has anyone used this, or even priced it?

I've been contemplating this project for a long time - with the boat 4.5 hours away I really like the idea of a bolt-and-go solution.

-dan

Re: Replacing spin halyard sheave [Re: whitedolphin] #9492
05/07/10 10:15 AM
05/07/10 10:15 AM
Joined: Apr 2003
Posts: 649
Marblehead, MA
dbows Offline
Senior Member
dbows  Offline
Senior Member
Joined: Apr 2003
Posts: 649
Marblehead, MA
I almost bought it last year but you have to change your forestay length to make it work. I think the pin is about 1" different than the old version. I do not remember if it is longer or shorter. So this ment futzing with my roller furler extrusions etc.

From what I remember it is quite a weight difference, particularly when it is 30 feet above the deck.

DB


David Bows
Mallorca - Hull# 397
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Re: Replacing spin halyard sheave [Re: gmo] #9500
05/07/10 06:15 PM
05/07/10 06:15 PM
Joined: Oct 2009
Posts: 42
Seattle, WA
gmo Offline OP
Senior Member
gmo  Offline OP
Senior Member
Joined: Oct 2009
Posts: 42
Seattle, WA
The new one is $497. from the site:

Quote
When replacing this item with the new K-11597-1 (the mast cutout needs to be widened and extended downward), the Forestay pin will be 1" higher on the mast; the forestay length will change accordingly.


How does this effect the class rule on forestay length? I think mine (with the old box) is at the class max. This doesn't indicate whether the hoist height changes for the jibs.


Grady Morgan
Slingshot - Hull #112
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