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  #1  
Old 04-03-2009
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Martec Prop Cotter Pins

I've got a martec folder on my S2. Last year I replaced the pins - getting new monel pins from martec (at a cost of $10...).

Question, do these props really need monel pins v. stainless? Anyone out there using stainless cotter pins on their martec? Monel pins are impossible to find and i don't really want to spend yet another $10 on new pins.

I haul every year so would put in new stainless pins annually.

Thx.
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Old 04-03-2009
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Ask yourself "What is the worst that can happen if that cotter pin breaks from crevice corrosion...or the cotter pin rots the prop" and then see what repairing that is going to cost you, and figure out how many years of cotter pins that repair would pay for...

That's why I have AAA Plus for my car and a TowBoat US membership for my boat.
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Last edited by sailingdog; 04-03-2009 at 04:18 PM.
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Old 04-03-2009
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Martec STRONGLY advises against using stainless cotter pins to avoid electrolysis with the bronze prop. Bite the bullet and get them.
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ah..so they did not advise me of that when I called them last year.

so help me understand if electrolysis is an issue - how come the stainless shaft does not appear to have any electrolysis issue?



Quote:
Originally Posted by JimsCAL View Post
Martec STRONGLY advises against using stainless cotter pins to avoid electrolysis with the bronze prop. Bite the bullet and get them.
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Old 04-03-2009
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dude, its $10.
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yeah yeah - not the cost - need them quickly...

actually now found a local source....after an hour of web surfing...

Quote:
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dude, its $10.
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Old 04-04-2009
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Quote:
Originally Posted by rperret View Post
so help me understand if electrolysis is an issue - how come the stainless shaft does not appear to have any electrolysis issue?
Because the shaft is likely not made of stainless steel, but rather Monel, just like the cotter pins.
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Old 04-04-2009
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Quote:
Originally Posted by rperret View Post
ah..so they did not advise me of that when I called them last year.

so help me understand if electrolysis is an issue - how come the stainless shaft does not appear to have any electrolysis issue?
Shaft is big, and it is also towards the boat from the prop. So the electricity flow is from shaft to prop to water. This prevents much corrosion occuring at shaft. Pins are small and they are between prop and water, so since stainless is less noble than bronze, pins will act as sacrificial anodes and may dissolve relatively quickly.
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IF the cotter pin acts as a sacrificial anode and corrodes away, like the zincs do, what is keeping your prop in place????
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Quote:
Originally Posted by brak View Post
Shaft is big, and it is also towards the boat from the prop. So the electricity flow is from shaft to prop to water. This prevents much corrosion occuring at shaft. Pins are small and they are between prop and water, so since stainless is less noble than bronze, pins will act as sacrificial anodes and may dissolve relatively quickly.
This doesn't even make sense.
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