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Strengh rudder axcis Aluminun

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812 View Drop Down
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    Posted: 16 November 2018 at 22:12
Hi, having galvanic Problems with my Aluminium rudder axcis on our H 375 I would like to know something about the strengh of this rudder axcis. Can someone tell me how thick the walls on that pipe is? Is there any experience in the Group dealing with this Subjekt?
Carsten
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Post Options Post Options   Thanks (1) Thanks(1)   Quote alettaenmarcel Quote  Post ReplyReply Direct Link To This Post Posted: 17 November 2018 at 07:53
It aint a pipe!
It is a masive alu .
See the jefa website.
The rudder in total weights about 52 kg and the masive alu stock itself weights about 36 kg.
Kids Dingys 72-79 ,Several Windsurfboards 79-86 OK dingy competitions 86-92 , Trotter Pandora Race 92-98, Friendship 28 Sport 98-05, Hanse 370 06-......
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Ratbasher Quote  Post ReplyReply Direct Link To This Post Posted: 18 November 2018 at 17:51
This forum has a lot of comment about this. When I bought my 2008-model boat two years ago I noticed a fair amount of pitting.  The surveyor said it was nothing to worry about and the main UK Hanse dealer echoed this, showing me a 'spare' rudder post to show how massive a structure it is.  Apparently its only the visible 2cm part of the stock that corrodes.

However, I didn't agree that it was nothing to worry about, especially as other issues with corrosion became evident later.  Although the rudder post is supposed to be electrically isolated, the experience in this forum suggests that this may be hard to achieve in practice.  Last year I fitted a hull anode and bonded both the rudder post and the saildrive leg to this as I'd also had problems with the leg's anode being eaten rapidly.  This year there's been no further (visible) pitting on the rudder post and the SD leg's anode has lasted so much better, while the hull anode has depleted nicely showing that its doing its job properly.  

The rudder post is indeed massive and I'm not concerned about its integrity. However, I'll be keeping a very close watch on the post, saildrive and anodes. 
Rat

Hanse 400, south coast UK
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Carlosailfan Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2018 at 07:27
Hello, there are a lot of opinions on this but galvanic corrosion is an issue even on GRP boats. I installed a separate anode only connected to the rudder, one only connected to the saildrive and another only for the keel. Yes I made a few holes but the result great, no oxidation, no rust, nothing any more. Only partly eaten anodes what is fine.
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/C
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Sea-U Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2018 at 09:39
Jefa says that we should paint the exposed part with epoxy. I think that will help a little.

Sea-U is a 370e #532 located SW Norway
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Post Options Post Options   Thanks (1) Thanks(1)   Quote redlion Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2018 at 09:56
I use the same spray paint I use on the saildrive https://international-yachtpaint.com/en/gb/boat-paint-products/antifouling/trilux-prop-o-drev .It appears to work well and is easy to apply.
It,s not over till the fat lady drowns
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Post Options Post Options   Thanks (1) Thanks(1)   Quote StavrosNZ Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2018 at 21:07
prop speed for both prop itself and aluminium leg is an excellent option, if applied properly it lasts a long time and provides a coated protection to the material its applied to.


Stephen
2010 H400, Auckland, New Zealand
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 812 Quote  Post ReplyReply Direct Link To This Post Posted: 04 December 2018 at 21:16
Hi, thank you very much to all of you, this is what Jefa said, on top there are very interesting links:


Dear Michael

I have seen this before, read the bulletin from Hanse, attached.

Your rudder stock is made in solid aluminium 6082, and I donít think the problem is so deep, that it canít be repaired.

The stock can be fixed with a sleeve and a bigger bearing. This will cost Ä.420,- +VAT

https://jefa.com/products/sleeves/sleeves.htm

https://jefa.com/ftp/rudder/Bearingballs/M13-248-92.PDF

This will stop the problem, but the loss of strength will not come back.

You have to check if any electricity is connected to the stock. Thatís the reason for the corrosion.

https://jefa.com/install/electro.htm

Drawings:

https://jefa.com/ftp/old_boat_spare_parts/Hanse/Hanse_375/

(hanse 405, 375 and moody 41, use the same rudder)

Med venlig hilsen / Best regards

Jan Faurschou
Sales and Service Representative


Carsten
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