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  #1  
Old 04-22-2012
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Dark spots on the rudder - what am I looking at?

I have these dark spots on my rudder, but not on the hull for some reason. They don't feel wet to the touch. Am I looking at a concentrated case of blisters?



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Old 04-22-2012
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Re: Dark spots on the rudder - what am I looking at?

The rudder has water intrusion, very common. very easy to fix, near impossible to prevent.
First thing to do is drill a hole in the bottom! Prepare thyself for lots of sanding, filling, and barrier coating. "been there done that"
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Old 04-22-2012
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Re: Dark spots on the rudder - what am I looking at?

Denise,
Unless you took it apart, and verified that the post and straps are still in good shape then it really isn't repaired. I don't believe there actually is a way to keep water out of a rudder, too much going on there for it to remain completely sealed. The low oxygen environment inside a rudder blade is really bad for crevice corrosion on stainless. I took mine apart because there was serious corrosion of the post between the blade and the hull. Turns out the post and straps inside the rudder were all aluminum, and bright and shiny like the day it was built 28 years ago! The serious corrosion was caused by electrolytic action from copper bottom paint reacting with the aluminum. I was able to find out what the alloy was and welded it up.

The good news is that splitting a rudder and putting it back together again is a relatively simple process.

Gary H. Lucas
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Old 04-22-2012
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Re: Dark spots on the rudder - what am I looking at?

Yup, I know Gary, so far mine is still rather solid and no brown ooze yet. I was going to take it home this winter but since we had no winter to speak of.
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Old 04-22-2012
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Re: Dark spots on the rudder - what am I looking at?

A waterlogged rudder.... *sigh* One more item on the spring to do list. Thanks for the tips, Denise.
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Old 04-22-2012
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Re: Dark spots on the rudder - what am I looking at?

I wonder if there is a dry rudder anywhere that's not new. Don't despair Bill
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Old 04-22-2012
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Re: Dark spots on the rudder - what am I looking at?

Quote:
I wonder if there is a dry rudder anywhere that's not new.
Ours. Just dry, unblemished paint, thank goodness.
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