chuck wrote:
One more quick thought. If you know the approximate surface area of the
prop and the weight of the zinc lost in say 2 months, it is fairly easy
to figure out whether that is in the normal range. Let us know and we'll
try to tell you.

Chuck

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Yet another thought.

If your larger zincs really do look
"new" (i.e., they are shiny) then they
are probably active. An inactive zinc
usually looks dark and tends to acquire
a film characteristic of submerged matter.

Chuck