Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 13-11-2012, 16:44   #1
Registered User

Join Date: Jul 2009
Location: Ontario, Canada
Boat: Niagara 31
Posts: 252
Forestay wire to be 8/32" or 9/32" ?

Next Spring, I'll be installing a new forestay and assembling a new Furler. The new furler can take 7/32", 8/32" (1/4") or 9/32" diameter wire.

Are there any disadvantages to using the largest size, i.e. 9/32" ? (other than weight, which I'm not that concerned about).

The previous wire was 8/32" (1/4'), but I don't know whether it was 304 or 316 stainless steel. I've been recommended to move up to 9/32" and use 316 grade ss wire.
__________________

__________________
macbeth is offline   Reply With Quote
Old 13-11-2012, 18:39   #2
Senior Cruiser

Cruisers Forum Supporter

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 17,314
Re: Forestay wire to be 8/32" or 9/32" ?

If the new terminals that go with the thicker wire have the same pins then you are fine. But if the pins are larger diameter then you may be forced to drill bigger holes in the plate(s).

If strength is an issue you can use dyform to get an extra edge.

b.
__________________

__________________
barnakiel is offline   Reply With Quote
Old 13-11-2012, 18:41   #3
Senior Cruiser
 
SkiprJohn's Avatar

Cruisers Forum Supporter

Join Date: May 2006
Location: Kea'au, Big Island, Hawaii
Boat: Cascade, Sloop, 42 - "Casual"
Posts: 14,192
Re: Forestay wire to be 8/32" or 9/32" ?

Will the larger wire require chainplate and tang holes being bored out to accomodate larger clevis pins? If so, don't do it. If you can maintain the same turnbuckles, tangs and clevis pins then 9/32 would be ok. 9/32 requires the use of 1/2 turnbuckles and clevis.
Weight aloft is always a consideration but the difference in wire weight will not be much.
kind regards,
__________________
John
SkiprJohn is offline   Reply With Quote
Old 13-11-2012, 20:23   #4
Marine Service Provider

Join Date: May 2012
Location: New Orleans
Boat: We have a problem... A serious addiction issue.
Posts: 3,940
Re: Forestay wire to be 8/32" or 9/32" ?

Unless you have a justification for moving up in size I can't see why you would. Even the smallest size is pretty large for a 30' boat.
__________________
Greg

- If animals weren't meant to be eaten then they wouldn't be made of food.
Stumble is offline   Reply With Quote
Old 13-11-2012, 20:28   #5
Senior Cruiser
 
Jim Cate's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 11,467
Re: Forestay wire to be 8/32" or 9/32" ?

Quote:
Originally Posted by Stumble View Post
Unless you have a justification for moving up in size I can't see why you would. Even the smallest size is pretty large for a 30' boat.
For rigs with furling headsails, a common failure mode is fatigue cracking of the wire where it exits the upper terminal. The extra strength of the 9/32 wire would give a slightly better margin against this happening.

So, if the other hardware is compatible, I'd go 9/32 myself. The differences in weight and cost are insignificant IMO.

Cheers,

Jim
__________________
Jim and Ann s/v Insatiable II , lying Port Cygnet, Tasmania once again
Jim Cate is offline   Reply With Quote
Old 13-11-2012, 20:32   #6
Registered User
 
Ziggy's Avatar

Join Date: Apr 2008
Location: U.S., Northeast
Boat: Contessa 32
Posts: 1,421
Images: 2
Re: Forestay wire to be 8/32" or 9/32" ?

Actually, 1/2" turnbuckles and pins are often used with 1/4" wire, so you may be fine with 9/32". Incidentally, for 316 stainless 1x19 wire, the breaking strength of 1/4" is 6900lbs and for 9/32" it is 9250 lbs.
__________________
... He knows the chart is not the sea.
-- Philip Booth, Chart 1203
Ziggy is offline   Reply With Quote
Old 13-11-2012, 20:56   #7
Registered User
 
Cruiser2B's Avatar

Join Date: Apr 2011
Location: Norfolk
Boat: Westsail 32
Posts: 367
Re: Forestay wire to be 8/32" or 9/32" ?

I just rerigged my Alberg and upsized to 9/32, from 1/4 and all of the pins were still 1/2 clevis and 1/2 turnbuckles. I used sta-locs. No drilling required

I did this because I believe the original design of the boat was factored for 304 stainless which is quite a bite stronger than 316. The upsized 9/32 316 1x19 wire was only about 1000lbs stronger than the orginal 304 1/4 wire. Since i did not want to put weaker parts back on my boat I upsized. And it looks good too!
__________________
http://svsalacia.blogspot.com
1971 Alberg 30..preparing to get underway!
USCG 100T Master Near Coastal with Inland Aux Sail
Cruiser2B is offline   Reply With Quote
Old 13-11-2012, 21:15   #8
Registered User
 
GaryMayo's Avatar

Join Date: Nov 2011
Location: Branched Oak Yacht Club, Wife is an Admiral in the Nebraska Navy
Boat: Clipper Marine 32 CC Aft Cabin Ketch
Posts: 1,211
Someone posted a ratio of displacement to cable breaking strength. Does anyone here know that formula? Ment to jot it down, and did not.
__________________
W.I.B. Crealock when asked what he thought of the easily trailerable Clipper Marine sailboats by a naval design collegue, Gentelman Bill responded, "I am very proud of them".
www.clippermarine.org & www.clipper-sailor.net
GaryMayo is offline   Reply With Quote
Old 14-11-2012, 05:56   #9
Registered User
 
Ziggy's Avatar

Join Date: Apr 2008
Location: U.S., Northeast
Boat: Contessa 32
Posts: 1,421
Images: 2
Re: Forestay wire to be 8/32" or 9/32" ?

Quote:
Originally Posted by GaryMayo View Post
Someone posted a ratio of displacement to cable breaking strength. Does anyone here know that formula? Ment to jot it down, and did not.
I think such formula is way too simplistic. You need to calculate the actual loads on standing rigging.
__________________
... He knows the chart is not the sea.
-- Philip Booth, Chart 1203
Ziggy is offline   Reply With Quote
Old 14-11-2012, 18:22   #10
Registered User

Join Date: Jul 2009
Location: Ontario, Canada
Boat: Niagara 31
Posts: 252
Re: Forestay wire to be 8/32" or 9/32" ?

Thanks so far. All current clevis pins are 1/2", so going to 9/32" would not be a problem. And I can get a Sta Lok stud for the upper end of the turnbuckle in either 1/4" or 9/32" fitting in a turnbuckle that has a toggle pin diameter at the bottom end that is 0.5"

I was more thinking about having a bigger bulk of wire in the inner plastic lining/tubing with the 9/32" - less room for the wire to "slop" about in as the furler twists. For example, is it going to be harder to pull in or reef the genoa with 9/32" wire as opposed to 8/32" wire ? Will it be more necessary to ensure the forestay is tight with 9/32" ? etc.

Can you tell the difference between 304 and 316 visually ? If I knew the old 8/32" (1/4') was 316, I'd probably stay with it.

More opinions welcome.
__________________
macbeth is offline   Reply With Quote
Old 14-11-2012, 19:48   #11
Registered User
 
Ziggy's Avatar

Join Date: Apr 2008
Location: U.S., Northeast
Boat: Contessa 32
Posts: 1,421
Images: 2
Re: Forestay wire to be 8/32" or 9/32" ?

Quote:
Originally Posted by macbeth View Post
Can you tell the difference between 304 and 316 visually ? If I knew the old 8/32" (1/4') was 316, I'd probably stay with it.
The breaking strength of 1/4" 304 wire is 8,200 lbs. For 9/32" 316 it is 9,250 lbs. So you'll be safe replacing your 1/4" forestay with 316 9/32" regardless. If the manufacture says the new furler can take 9/32", I expect it will fit and furl without any problems.
__________________
... He knows the chart is not the sea.
-- Philip Booth, Chart 1203
Ziggy is offline   Reply With Quote
Old 15-11-2012, 20:36   #12
Registered User

Join Date: Jul 2009
Location: Ontario, Canada
Boat: Niagara 31
Posts: 252
Re: Forestay wire to be 8/32" or 9/32" ?

How can I tell whether my old forestay wire was 304 or 316 ?
__________________
macbeth is offline   Reply With Quote
Old 15-11-2012, 20:42   #13
Registered User
 
Ziggy's Avatar

Join Date: Apr 2008
Location: U.S., Northeast
Boat: Contessa 32
Posts: 1,421
Images: 2
Re: Forestay wire to be 8/32" or 9/32" ?

I think you would need to send a sample to a lab for analysis.
__________________
... He knows the chart is not the sea.
-- Philip Booth, Chart 1203
Ziggy is offline   Reply With Quote
Old 15-11-2012, 22:55   #14
Registered User
 
GaryMayo's Avatar

Join Date: Nov 2011
Location: Branched Oak Yacht Club, Wife is an Admiral in the Nebraska Navy
Boat: Clipper Marine 32 CC Aft Cabin Ketch
Posts: 1,211
Quote:
Originally Posted by macbeth
How can I tell whether my old forestay wire was 304 or 316 ?
Decent scrap iron business will do it free if they think they can make a buck. Use your imagination.
__________________
W.I.B. Crealock when asked what he thought of the easily trailerable Clipper Marine sailboats by a naval design collegue, Gentelman Bill responded, "I am very proud of them".
www.clippermarine.org & www.clipper-sailor.net
GaryMayo is offline   Reply With Quote
Old 15-11-2012, 23:30   #15
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: Forestay wire to be 8/32" or 9/32" ?

304L is slightly magnetic, 316L is not. Use a strong magnet to test.
__________________

__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 07:45.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.