Hello I have a Whitby 45 that has a Max prop with a zinc mounted on the aft end of the prop that gets eaten up in about 4 months and i have a shaft zinc that looks brand new after 6 months. I am on a mooring most of the time ? Why is the max prop zinc being consumed so quickly and the other not touched Cavitation? stray current? solar panels not properly grounded? Ideas Thank You
It is sacrificing itself to protect the prop. This is normal when you have 2 dissimilar metals connected together. The other zinc is further away and doesn't have any adjacent targets so it survives. If you have room on the shaft, put both zincs near the prop.