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Old 08-18-2008
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Propeller damage

Hi,

I have a fiberglass sailboat with stainless steel inboard engine shaft and a bronze "Max prop" propeller on it. When I purchased it 4 years ago during inspection I've noted that zinc anodes attached to the shaft and propeller (same as on the photo) were in reasonable condition. I kept the boat in the water for another 3 years and last year in July I hauled it out for painting when I have noted that both zincs were just about gone which I have replaced with new ones.
This year in May (10 months after the last haul out I noticed that the propeller zinc was missing but did not haul it out until last weekend when I noticed that both zincs were gone completely and unfortunately one of the propeller blades was found with pittings as per attached photographs. Other two blades are still in perfect condition.
Over last four years since I am keeping the boat in this marina I've heard people talking about stray currents damaging boats / propellers and shafts and some of the people use additional zinc anodes attached to boat's battery negative terminal and submerged in the water to protect from this.
Is this a solution and if not what would you suggest?

Petar

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Old 08-18-2008
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You really need to change the zincs a bit more often I'd say every 6 months is not too soon.
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Old 08-18-2008
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You should generally replace zincs when they're down to 50% of their original diameter.
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Old 08-18-2008
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Quote:
Originally Posted by brak View Post
You really need to change the zincs a bit more often I'd say every 6 months is not too soon.
Quote:
Originally Posted by sailingdog View Post
You should generally replace zincs when they're down to 50% of their original diameter.
+1 to both of these suggestions. Your zincs should last 6 to 9 months. Significantly more or less is indicative of a problem.
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