[C320-list] Anti Corrosion Zinc

[Joseph Aberdale]

I am a new owner and recently hauled my boat out for the season.  I  
noticed that the previous owner had a zinc mounted on the propeller  
shaft and it was pretty corroded.  I also noticed that similar size  
boats in the yard had 2 and 3 zincs on their shafts.  Is there any  
advantage/disadvantage in having more than one zinc on the shaft?

Thanks.

Joe
#908