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Halyard Loads #9389
04/22/10 08:10 PM
04/22/10 08:10 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 wondering if you guys know how much load our haylards (and uphaul) need to be able to handle.

Looking at the equipment and line i'm currently using, I'm guessing that sheaves and line that could handle 700Lbs working load should be good for a replacement spinnaker halyard.

I also want to replace my uphaul sheaves, and I'm guessing that they should be ok with significantly less (even though the recommendation seems to be 3/8" line).


Grady Morgan
Slingshot - Hull #112
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Re: Halyard Loads [Re: gmo] #9390
04/22/10 08:37 PM
04/22/10 08:37 PM
Joined: May 2007
Posts: 2,658
Portsmouth, RI
Rhapsody #348 Offline
Past J/30 Class President
Rhapsody #348  Offline
Past J/30 Class President
Joined: May 2007
Posts: 2,658
Portsmouth, RI
Check out this old thread for a good discussion on loads.

Re: Halyard Loads [Re: gmo] #9396
04/23/10 04:02 PM
04/23/10 04:02 PM
Joined: Oct 2009
Posts: 42
Seattle, WA
gmo Offline OP
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gmo  Offline OP
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Joined: Oct 2009
Posts: 42
Seattle, WA
Thanks Bill,

Since the spinnaker doesn't generate lift the same way the foils do, I can't use the formula they talk about there to calculate spinnaker loads. I sent harken an email asking for info. Using the compu-spec tool for a J/30, they recommend a mast base block with a working load of 792 lbs, which is in-line with what I was guessing. Disqualifies that harken ball-bearing sheave everyone's been talking about...

-g


Grady Morgan
Slingshot - Hull #112
Re: Halyard Loads [Re: gmo] #9430
05/02/10 09:47 PM
05/02/10 09:47 PM
Joined: Oct 2009
Posts: 42
Seattle, WA
gmo Offline OP
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gmo  Offline OP
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Joined: Oct 2009
Posts: 42
Seattle, WA
I emailed harken about the sheave loads, and here's what they gave me:

> Halyard sheave blocks are going to see a little more load because they turn at a greater angle. I would think the spinnaker halyard sheave would see just under and the jib halyard just over 1,000 pounds maximum working load.

It is really a non issue, though, because as far as I can find, rig-rite is the only place selling replacement sheaves that'll fit my jib-box. They need to be 31/64" wide...


Grady Morgan
Slingshot - Hull #112
Re: Halyard Loads [Re: gmo] #9434
05/03/10 02:38 PM
05/03/10 02:38 PM
Joined: Jan 2009
Posts: 75
Kailua Kona, HI
last fling IV Offline
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last fling IV  Offline
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Joined: Jan 2009
Posts: 75
Kailua Kona, HI
Find an approprate oversize sheave and a friend with a lath or a small machine shop and make it fit instead of giving money to a business that doesn't seem to care about serving their customers. There are no suppliers in the middle of the Pacific ocean.
Last flingiv-Hawaii

Re: Halyard Loads [Re: last fling IV] #9444
05/04/10 08:11 AM
05/04/10 08:11 AM
Joined: May 2007
Posts: 1,234
Newport and Naples
Cap'n Vic Offline
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Cap'n Vic  Offline
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Joined: May 2007
Posts: 1,234
Newport and Naples
31/64 is seriously precise measurement ... you sure its not half inch? don't think Kenyon worked to that level 30 years ago. now everthing is confused by metric options.

Unless of course a PO revamped your mast.

http://rigrite.com/Spars/SparParts/Sheaves.html#2

Re: Halyard Loads [Re: gmo] #9452
05/04/10 06:33 PM
05/04/10 06:33 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 tried to put a harken 1/2" sheave in my pole lift exit block (which uses the same sheaves as the jib halyards) and it wouldn't fit. It also had a much smaller OD which would have required me to drill a new axle hole in an impossible location.

search the rigrite link you sent me for "K-198-8A". This is the top spin halyard sheave.

-g


Grady Morgan
Slingshot - Hull #112
Re: Halyard Loads [Re: gmo] #9454
05/04/10 09:28 PM
05/04/10 09:28 PM
Joined: May 2007
Posts: 1,234
Newport and Naples
Cap'n Vic Offline
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Cap'n Vic  Offline
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Joined: May 2007
Posts: 1,234
Newport and Naples
so OK ... is a wire grove what you are looking for?

or does their

2" Nylatron Sheave - 31/64" wide, 3/8" ID: K-11638:
Heavy-duty Nylatron Sheave is 2" OD x 1/2" (.484") wide x 3/8" ID. As used on Kenyon Jib Boxes, K-11590 and K-11591 (upper Sheave), and in other applications. With Rope Groove.

work for you?

I think there is a move away from wire ...

if you are talking .016 in. as a problem oversize ... you could sand it down?



Re: Halyard Loads [Re: gmo] #9480
05/06/10 04:50 PM
05/06/10 04:50 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 was just pointing to that sheave to illustrate the size precision. I have wire halyards right now, but plan to move to rope when I replace them.

Also, I found a local company that custom cuts delrin sheaves: http://zephyrwerks.com/. Their prices are competitive and the guy was pretty nice and helpful on the phone. I'll post some photos whenever they come in.


Grady Morgan
Slingshot - Hull #112

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