I've just scraped the hull
on my full keel Formosa
Diver suggested 1 1/2 collar zinc for the shaft. That seems easy to fix/replace.
Next zinc he suggested is ZHC5 zincs one for each side of rudder
Is there a source explaining what zincs and sizes are needed per this boat
and or others?
Seems like a lot, the zincs aren't cheap
and quite large.