[alberg30] zinc

[Robert Kirk]

From: Robert Kirk <kirk at neptune.gsfc.nasa.gov>

At 09:43 AM 11/17/99 -0500, George Dinwiddie wrote:

>Anytime you have dissimilar metals in a conductive solution,
>you'll get electrolytic corrosion.  Fresh water is not nearly
>so conductive as salt, so the speed of the corrosion may be
>slower, but it'll still happen.  Zincs are a cheap means of
>protecting your bronze.

George is right, you do need them.  I use one of those teardrop shaped 
zincs that fit on an adapter which screws onto the end of the 
propeller.  They are readily available in the boat stores and simplicity to 
replace each year.  Each year it comes off corroded enough to show that I 
was right to use one, but not completely corroded away.

I have heard that some configurations don't have enough room between the 
end of the shaft and the rudder to fit them, but they only require an inch 
or two.

Bob Kirk
Isobar #181

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