[Public-List] Propeller Shaft Material

[Gordon Laco]

Well I have to admit that my professional opinions are coloured by my  
sailing on fresh water.   I'll read what you sent, George.

G




On 5-Jan-10, at 10:42 PM, George Dinwiddie wrote:

> Gord,
>
> What do you think about the potential for crevice corrosion in  
> stainless? http://alberg30.org/maintenance/Steering/CreviceCorrosion/
>
> - George
>
> Gordon Laco wrote:
>> Hello -
>> I have aluminium bronze in 1 1/2" rod in stock; I use it to  
>> fabricate custom large turnbuckle studs and lifeline stanchions.   
>> Alum Bronze is a particularly hard alloy but that said, I think a  
>> 316 grade stainless shaft will be superior in most aspects  
>> including avoidance of galvanic corrosion and certainly wear.  The  
>> Achilles heel of 316 is that it is relatively brittle compared to  
>> galv steel or 304... but hardness and stiffness is what you want in  
>> a prop shaft.  Not malleability, which is what makes bronze alloys  
>> attractive.    If I were having a new shaft made I would use 316  
>> stainless with no hesitation.
>
> -- 
> ----------------------------------------------------------------------
>  When I remember bygone days                         George Dinwiddie
>  I think how evening follows morn;            gdinwiddie at alberg30.org
>  So many I loved were not yet dead,           http://www.Alberg30.org
>  So many I love were not yet born.                          also see:
>               'The Middle' by Ogden Nash     http://idiacomputing.com
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