[Public-list] rigging upgrades

[William Wallace]

I knew I should have kept that damn Central Wire steel book! : )

I remember reading about how one of the stainless grades (I thought 
316) was more susceptible to corrosion in an oxygen deficient 
atmosphere...I knew one was stronger, but wasn't sure which!

I worked with metallurgists years ago for a valve manufacturing company 
and later for GE Aircraft, where we worked with Rene 95, and all kinds 
of exotic stainless and titanium.  At the valve company we worked with 
304, 316, 316L, monel, iconel and hastelloy B and C.  That was many 
years ago, so my memory may be a bit foggy: )

Thanks,

Scott
On Saturday, March 5, 2005, at 07:37 PM, John Birch wrote:

> Forgive me Scott, but 316 has greater corrosion resistance than 304 - 
> but not quite as strong as 304 - about 8-10% less.
> Norseman's and Stalocs are made of 316.
> Dyform 1x19 316 wire makes up for this in the unique way it is formed 
> - actually about 20% stronger than 304 of the same diameter. However 
> dyform is very hard on mylar sails.
> Sunstone has Dyform wire retrofitted on it with Norsemans.
> So far, so good - been on 7 years so far ... touch wood - finger 
> pressing against temple ; )
>
> Hope this is a help ... or at least amusing.
>
> Cheers,
> JB
>
> ----- Original Message ----- From: "William Wallace" <tristan at one.net>
> To: "ellen landrum" <erlandrum at gmail.com>; "Alberg 30 Public List -- 
> open to all" <public-list at alberg30.org>
> Sent: Saturday, March 05, 2005 11:18 AM
> Subject: Re: [Public-list] rigging upgrades
>
>
>> 316 doesn't have the corrosion resistance of 304; I forget now, but I 
>> used to have a steel book with the various percentages of nickel, 
>> chromium, etc. in the different stainless steel ranges...
>>
>> Some sailors complain that Norseman fittings can be hell to change at 
>> sea, when the wind is blowing 40 knots and your boat is buffeted 
>> about by ten foot waves!  Those times, it always seems, are when the 
>> rigging goes!
>>
>> Scott Wallace, Rhodes Meridian
>>
>> On Saturday, March 5, 2005, at 10:26 AM, ellen landrum wrote:
>>
>>> Hello A30 List-
>>>
>>> We have been cruising the East Coast and Florida for the past few
>>> months and have had limited access to the list. Please forgive us if
>>> these questions were discussed recently, but as we prepare the boat 
>>> to
>>> cruise Central America, we could use some advice:
>>>
>>> 1. We are installing a ham system and insulated backstay. It's come 
>>> to
>>> our attention that the A30 was originally rigged with 304 stainless,
>>> and now recommendations have been to upgrade to 316 stainless for all
>>> standing rigging. We've heard that when going with 316 the wire size
>>> must increase to retain the same strength as the 304 rigging. Has
>>> anyone completed this process recently? Did you go with a larger wire
>>> size? Any advice/experience we'd appreciate more than you know!
>>>
>>> 2. We caught the tail end of a conversation regarding new masthead
>>> fittings. Could we have a brief synopsis of that discussion? In
>>> dealing with the backstay issue, we are interested in replacing the
>>> masthead, as we'd like to use Sta-Lock or Norseman fittings
>>> exclusively and the present set-up would make it difficult to use
>>> them, esp. on the forestay. Has anyone switched over to unswaged
>>> fittings? Any troubles? And if folks are ordering new mastheads, we'd
>>> love to hear about them.
>>>
>>>  We are sitting on a mooring in Marathon, FL with another 3 A30s,
>>> delighted to have similar company. You can email to the list or to us
>>> personally with more detailed info- Erlandrum at gmail.com.
>>>
>>> Thanks so much!
>>> -John and Ellen Landrum
>>> s/v Rubicon (hull #72)
>>> http://www.ellenjohnandrubicon.blogspot.com
>>> _______________________________________________
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>>>
>>
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