[Otium]

We have a Bavaria 36. During reapplication of antifoul this season corrosion was noted to the aluminium rudder stock, which projects below the hull. A continuity test between hull mounted anode and rudder confirmed no circuit. Internal inspection revealed there to be no cable connection between the rudder stock and the anode.

Can anyone offer any advice whether a cable connection should be provided between the rudder stock and the hull mounted anode, which is connected to the engine/sail drive.

Regards
Steve Otium- Burnham on Crouch

[RichardB]

Hi – I sent an in-depth reply to this post hours ago along with pictures. Did the post arrive?

[Otium]

Hi Richard
Sorry I can’t see your earlier post only the one sent at 2.15pm today ?
Regards
Steve

[RichardB]

Hi Steve – I’ll try again…….

We have a Bavaria 42 Cruiser (2005) and the aluminium lower (through hull) rudder bearing housing was very corroded. The rudders were becoming very stiff and resistant to turning.

This first photo graph shows the original housing from inside the lazarette with no cable attached to the anode under the hull,

More to follow this but I’ll send it in multiple parts so I don’t lose a lot of time again.

[RichardB]

This one failed, so I’ll try again…

On the hard in France – this is what we saw:

[RichardB]

When cut out of the hull – this is what the housing looked like:

[RichardB]

So we decided, not only to have a new nylon bearing, but a new nylon housing too.

[RichardB]

[RichardB]

The cost was around €1,200 from memory.

[RichardB]

I hope that helps – so the summary is – that I don’t think this housing is protected by the lower aft hull anode.

That the corrosion arises from copper paint on aluminium.

That just changing out the nylon bearing is not the answer as it’s the housing distortion that is causing the constriction (in my case).

That a complete nylon replacement is the answer.

 

[Otium]

Hi Richard 

Many thanks for your response. Very illuminating.

The rudder on our boat is not showing signs of restricted movement. The corrosion appears limited as the attached.

It is proposed to provide anodic protection via the hull  mounted anode. A non copper antifoul is being used in the area around the head of the rudder.

Regards

Steve

 

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