[Public-list] Rudder shaft

[mainstay at csolve.net]

I agree - 

Bronze can be much harder and stronger than stainless steel; which is 
actually quite brittle.  In bronze the alloy is the thing; aluminium 
bronze and silicon bronze are both very good materials to make rudder 
shafts of.  If you are having any difficulty finding those materials, 
contact me off the list and i can steer you toward good suppliers and 
reasonable machine shops that I use.

Gord #426 Suprise

-----Original Message-----
From: "Chris Blain" <chris.blain at gmail.com>
To: "George White" <salty at ns.sympatico.ca>, "Alberg 30 Public List -- 
open to all" <public-list at alberg30.org>
Date: Tue, 8 Aug 2006 09:43:50 -0700
Subject: Re: [Public-list] Rudder shaft

> Just for reference - Bronze is not a soft metal. If it has been
> subjected to
> Galvanic corrosion, it can be greatly weakened, but then it still
> usually
> fails in a brittle mode rather than a ductile (twisting) one.
> 
> Bronze rudderstocks have long been used in this application. Stainless
> is
> now widely used, but is fairly poor choice for this application, as,
> ironically, it can be very succeptiable to corrosion if not correctly
> passivated, bonded and protected. Some Stainless alloys are better than
> others, so make sure that you use an established marine fabricator if
> you do
> decide to go that route.
> 
> Cheers,
> Chris
> 
> 
> On 8/8/06, George White <salty at ns.sympatico.ca> wrote:
> >
> > Our rudder shaft has a twist in it (probably caused by a strong hit
> > against a sunken cement pillar or being towed out from a grounding!)
> and
> > will have to be replaced.  It appears to be a soft metal - possibly
> bronze.
> >
> > Are their any suggestions or experience as to whether it should be
> > replaced with a hard metal such as stainless steel or a soft metal.
> >
> > Thanks,
> >
> > George & Kathy White
> > Close Harmony # 637
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