Re: [Cal_Boats] Bronze
Chris, you are in freshwater, so steel should not be as much problem as
for salties like me. Bronze would be great and was used to make
centerboards for many K/CB designs in the 1950s and 60's, possible well
into the 1970's. However, Bronze will be heavier. I believe (not a real
problem) but will also be big $$s, the price of a Bronze CB may come
close to the total value of the boat, maybe even more. I agree with those
that say the original lasted 51 years, why change (that is, it is better
to make a new CB from steel, not Bronze)? One other possibility, is using
a sheet of fiberglass, like some have used as backing plates, I think the
commercial material is called "G-10". Still may be pricey, but won't
rust!
Rod Johnson, "SUNBIRD"
1979 O'DAY DS II
former co-owner of "NODROG"
1970 CAL 21
On Mon, 09 Jul 2012 11:22:25 -0400 Chris Campbell <cc… [at] lsnm.org>
writes:
On 7/9/2012 11:01 AM, Joe DeMers wrote:
Make it from steel, any metal fabricator can do so. With today's
specialized coatings, steel will last a very long time.
Steel will also be MUCH MUCH less $ than bronze.
Problem with coated steel is that it operates in a tough environment.
The board runs in a trunk of iron (the ballast keel), which rusts (less
than steel, luckily) and is not smooth. Also we've got the invasive
mussels, zebra and quagga, with very sharp shells. And of course, I have
been known to find the bottom with my centerboard--bump, bang, oh shit!!!
Chris Campbell
SoundMarineDiesel.com
phone & fax (860) 666-2184
On 7/9/2012 10:40 AM, John Boyce wrote:
Question
The steel board lasted 51 years and you want to replace it with a better
material, how long do you intend to keep this boat?
From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On
Behalf Of Adam Thorp
Sent: Monday, July 09, 2012 10:26 AM
To: Ca… [at] yahoogroups.com
Subject: Re: [Cal_Boats] Bronze
I machined new chain plates out of a bronze alloyed with aluminum- C954
from onlinemetals.com after being advised on a forum or two.
Would not recommend..... they are rusting up, and I will have to redo the
work at some point with silicon bronze plate instead. Bummer.
On Mon, Jul 9, 2012 at 6:58 AM, Chris <cc… [at] lsnm.org> wrote:
Listmates:
My other boat has a steel centerboard and after 51 years of close
association with copper-bearing bottom paint, it's getting a bit ragged.
My notion is to replace it with bronze. So my question for you
metallurgists is what alloy to choose, and for you folks with specialized
knowledge, where to buy bronze plate.
As to the alloy, a centerboard needs to be stiff but not brittle, and
durable in a slightly corrosive environment. The 'board will be housed
in a cast iron ballast keel and lifted with a stainless steel
pendant/pennant (never have quite figured those terms out).
Thanks,
Chris Campbell
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--
Joe DeMers - owner
Sound Marine Diesel LLC
SoundMarineDiesel.com
phone & fax (860) 666-2184
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