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  #11  
Old 10-01-2013
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Re: Mast Life and When to Replace It ?

Quote:
Originally Posted by HighFly_27 View Post
Mr. Clarke,

Thank You for taking the time to explain things, I buy it.. 100%. I did not think about the difference of a unsupported aircraft component in comparison to a supported sailboat mast. I saw the alum. mast as being loaded & loaded (flexing) and causing metal fatigue of the alum. metal over time.

So, my 42 year old mast should be good... based on one small area of corrosion at the base. I should strip it and repaint it and put it back in service... not to worry. I'm guessing about $ 750.00 for materials.. against $ 4,700 with tax & pick up (370 miles away) at St. Pete., FL.


Thanks,

Avery
I had a corroded mast at the keel step on a 79'. Had to pull it out, chop off the bad, resheath a new section of mast tube and have it welded. Dropped it nack in and was good as new. Only cost a few hundred.
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  #12  
Old 10-01-2013
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Re: Mast Life and When to Replace It ?

You All,

I was going to bring up the Chain Plates and was going to inspect them... looking for evidence of corrosion. I did Not Realize that the bolts have/ or may be crystalized. I think that most of the chain bolt hardware is stainless steel.

I have to laugh.. the Titanic had issues with the hull steel (foundry problem) being brittle.. or so I heard in one TV report.

*** I'd like to hear from the folks that have replaced the keel bolts... especially on Islanders.

I assume that these keel bolts are available at the larger marine suppliers (who ?).



Avery

Last edited by HighFly_27; 10-03-2013 at 09:29 PM.
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  #13  
Old 10-03-2013
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Re: Mast Life and When to Replace It ?

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Originally Posted by HighFly_27 View Post
You All,

I was going to bring up the Chain Plates and was going to inspect them... looking for evidence of corrosion. I did Not Realize that the bolts have/ or may be crystalized.
The plates can be crystallized too.
One way of looking at it is that once you figure the cost and time of removing and re bedding the cost of some new steel after 30+ years of service seems reasonable.

One of own sailnetters lost his boat after a multi-year fitout due to a chain plate failure.
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  #14  
Old 10-03-2013
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Re: Mast Life and When to Replace It ?

david pm,

Where would you dig the keel plates up ? I assume that a full service / ship yard would have access to them. I have a steel fabricator back round, working on heavy equip. and heavy trucks. I could have them made up by a local machine shop / welding shop in Bonifay, FL.

I'm guessing mild steel, cold or hot rolled. Who would know the steel type and series number ? My I-37 has been out of production since 1974, so no help with calling the builder.

Anyone knowing the material used for keel plates... let me know. I'd like to up grade to a better grade of steel. I have used tool steel for fabrication but was round stock. I don't think it's available (rare) in flat stock.

Avery
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Old 10-06-2013
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Re: Mast Life and When to Replace It ?

316L stainless steel is the most common cited material.
It has to be polished and passivated however.

Need help about polishing stainless plate - Cruisers & Sailing Forums

They are called chain plates not keel plates.

Mild steel is a really bad idea unless you are shooting a movie and the boat will be sunk in a couple weeks.

You wouldn't go wrong with ordering them from Garhauer Marine Hardware
They are known for good pricing and they know exactly what you need which some local machine shop may not.

Be careful of the size hole you use for the toggle.
The business end of the shroud (the wire that holds up the mast)

There are lots of wrong ways to install them.
Read this:
Re-Bedding Deck Hardware Photo Gallery by Compass Marine at pbase.com

Also make sure that what you are bolting them to is solid.
Also make sure the core is solid where the chain plate penetrates the deck.

For not a lot of extra money you can get a another piece of ss steel fabricated to go on the opposite side of the knee, bulkhead or other attachment point.
That way instead of relying on just a washer you have a full length backing plate.

The job is either pretty easy or very hard depending on how hard it is to get to each plate.

If you want to know why they are important read this:

S/V Triumph lost in the atlantic

It is a long read but worth it to answer you particular question about if chain plates should be replaced if you plan on using your boat in heavy weather.

If you are young and plan on keeping the boat a long time and they are hard to get to and have a lot of extra money consider Titanium
http://theincrediblehull.blogspot.co...-economic.html
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Last edited by davidpm; 10-06-2013 at 12:48 AM.
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  #16  
Old 10-06-2013
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Re: Mast Life and When to Replace It ?

DavidPM

I had not gone that far with the Keel Plates (did not look at them). I did not know what they were made of. I reckon that my knowledge base on keel plates ain't to jazzy. I assumed... they were made of mild steel and had multi coats of high quality paint to protect them. Now, I know there made of 3116 stainless .. I get it. I read (your post) that the Stainless is Polished Out to a high degree to relieve Stress.

Thanks for the Help,


Avery
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Old 10-06-2013
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Re: Mast Life and When to Replace It ?

For structural applications, many times 304 is recommended. It is stronger than 316. Keel bolts, for example, are preferred 304. Consult a professional rigger. also, I've read that the best way to protect aluminium from corrosion is to leave it unpainted. Just a thought, although I like the painted look better!

Good luck,

Hans
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Old 10-06-2013
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Re: Mast Life and When to Replace It ?

I've had 3 boats, 1 with a painted mast and 2 bare. Guess which one had corrosion issues? Thank goodness my current mast is bare.

I owned each boat for over 10 years and they weren't new when I bought them.
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Last edited by pdqaltair; 10-06-2013 at 10:07 AM.
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Old 10-06-2013
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Re: Mast Life and When to Replace It ?

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Originally Posted by pdqaltair View Post
I've had 3 boats, 1 with a painted mast and 2 bare. Guess which one had corrosion issues? Thank goodness my current mast is bare.

I owned each boat for over 10 years and they weren't new when I bought them.
Are you sure that is "bare"? Mostly when mast sections are aluminium colored, they are clear anodised. Raw aluminium will corrode like billy-o.

If the anodising gets scratched it corrodes as badly as scratched paint.
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  #20  
Old 10-06-2013
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Re: Mast Life and When to Replace It ?

HighFly,
If your are going to use stainless as a step plate I suggest that you need a teflon isolater between the steel and the aluminum, otherwise the aluminum will act as an anode which is probably why you had the corrosion at the base of the mast in the first place. If you go to Dan Pfiefers Pearson 10M site there is a detailed description along with photos of a mast step replacement. dan.pfeiffer.net/10m
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