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scuba0_1 · 08-02-2015, 08:39

Not mine got the pic from some one else. Holy smokes.

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Tayana42 · 08-02-2015, 08:50

Speaking of zincs, I've been changing the zinc anode on my MaxProp every month or at most two. I thought it was from stray current in some " hot " marinas I was in. But even anchored out for a month the zinc is depleted. There is no other zinc on the shaft, only a pair if larger rectangular zincs on the keel which last a season or two. Someone suggested that I add a shaft brush tied into the bonding system. Any thoughts on a shaft brush?

S/V B'Shert

Orion Jim · 08-02-2015, 09:13

What brand is the sail drive? If it was still working in this condition I've got to get one

Terra Nova · 08-02-2015, 09:27

Wow! I'll stick with stainless and bronze.

Dhillen · 08-02-2015, 09:27

Quote:

Originally Posted by Tayana42

Speaking of zincs, I've been changing the zinc anode on my MaxProp every month or at most two. I thought it was from stray current in some " hot " marinas I was in. But even anchored out for a month the zinc is depleted. There is no other zinc on the shaft, only a pair if larger rectangular zincs on the keel which last a season or two. Someone suggested that I add a shaft brush tied into the bonding system. Any thoughts on a shaft brush?

S/V B'Shert

I don't have an answer but am curious as well. The zinc on my MaxProp is always the first to go.

Dhillen

colemj · 08-02-2015, 11:24

There is no zinc in the world that would protect against that. Besides, the zinc is still attached! That is impressed current - either from a wiring problem inside the boat, or a marina problem, or a problem on an adjacent boat.

It is not simple galvanic corrosion from a used zinc.

Mark

scuba0_1 · 08-02-2015, 11:57

I've never tried can you drop a metering device and the water to see if there's a current

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fstbttms · 08-02-2015, 13:47

Quote:

Originally Posted by Jim Walsh

What brand is the sail drive? If it was still working in this condition I've got to get one

Looks like a Yanmar.

Quote:

Originally Posted by colemj

There is no zinc in the world that would protect against that. Besides, the zinc is still attached!

The anode 100% depleted. Maybe it had been for years.

colemj · 09-02-2015, 04:33

Quote:

Originally Posted by fstbttms

The anode 100% depleted. Maybe it had been for years.

Isn't the anode still bolted onto it? I can't tell from the pic, but it looks like there is an anode between the prop hub and drive.

Even with the anode gone, this wasn't galvanic corrosion from prop or internal components. Not even in many, many years.

Mark

ontherocks83 · 09-02-2015, 04:52

I desperately want to move our boat to the ocean but pics like this make me really appreciate being on a large lake.

I don't know if people even know what zincs are on the lake.

jaybird1111 · 09-02-2015, 05:51

colemj is right. Volvo is very particular about instruction how to electrically isolate the drive from the engine, and I'd suggest that this drive, which isn't a Volvo, was never isolated

The zinc on the prop is still there. Also looks like a Gori propeller, which looks in good nick. Maybe because it's rubber-bushed to isolate it.