rudder post corrosion

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   Hi All,
I have noticed from the forum that rudder post corrosion can be an issue with the early Hanses, the 311, 341 and 371 and i am guessing the 411. I bought my 371 last year and it came with a brand new jefa rudder as the stock on the old one had totally corroded away. 
So I hauled last week to clean and antifoul and there is already signs of corrosion on the new rudder stock, 1 - 2mm pitting in a few areas. Nothing of major concern at the moment but it will become a problem if it persists. I have done some research and there is a lot of information but nothing definitive, so, can anyone advise what they have done that prevents this happening, do I need to fit a galvanic isolator, will a hanging anode work and if so what do I connect it to? etc etc. All advice appreciated.
Thanks
BAJJ

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BAJJ Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Joined: 18 May 2015 Location: Ireland Status: Offline Points: 45	Post Options Post Reply Quote BAJJ Report Post Thanks(0) Quote Reply Topic: rudder post corrosion Posted: 22 April 2016 at 16:49
	Hi All, I have noticed from the forum that rudder post corrosion can be an issue with the early Hanses, the 311, 341 and 371 and i am guessing the 411. I bought my 371 last year and it came with a brand new jefa rudder as the stock on the old one had totally corroded away. So I hauled last week to clean and antifoul and there is already signs of corrosion on the new rudder stock, 1 - 2mm pitting in a few areas. Nothing of major concern at the moment but it will become a problem if it persists. I have done some research and there is a lot of information but nothing definitive, so, can anyone advise what they have done that prevents this happening, do I need to fit a galvanic isolator, will a hanging anode work and if so what do I connect it to? etc etc. All advice appreciated. Thanks BAJJ

Yeoman Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 31 May 2007 Location: Hamble Status: Offline Points: 384	Post Options Post Reply Quote Yeoman Report Post Thanks(0) Quote Reply Posted: 22 April 2016 at 17:43
	Hi Bajj, If you have time it is well worth reading this article on rudder materials, electrolysis and corrosion. LINK- http://www.jefa.com/rudder.htm - then choose the 4th option down Kind regards Phil
	Inspiration Marine Group LTD - UK Importer for Hanse Yachts. Helping owner’s to get the best from their boats.

Bitbaltic Members Profile Send Private Message Find Members Posts Add to Buddy List Captain Joined: 26 November 2011 Location: South Wales, UK Status: Offline Points: 181	Post Options Post Reply Quote Bitbaltic Report Post Thanks(0) Quote Reply Posted: 22 April 2016 at 21:42
	If the range of reports received over the years on this forum is representative, the quality of materials sourced for rudder stocks on the early Hanses- production of which seems largely to have been outsourced in Poland- was universally poor. The problem is endemic with my boat (the 301) most of which are now 15-20 years old and I know of probably half a dozen boats which have reported problems on this forum and elsewhere. This 'early rudder issue' is so established that you might expect the surveying community to be aware of it by now? I'd be interested if anybody has had potential rudder problems flagged by a surveyor when buying an older Hanse. That said I have not heard of corrosion problems with a Jefa rudder (until now)!

bovine Members Profile Send Private Message Find Members Posts Add to Buddy List Commadore Joined: 18 November 2007 Location: United Kingdom Status: Offline Points: 405	Post Options Post Reply Quote bovine Report Post Thanks(0) Quote Reply Posted: 22 April 2016 at 23:30
	Hi guys My 430 from 2007 is on the hard for annual maintenance, I check the rudder stock every year and have no problems. I never ever leave it plugged into shore power when not on board, and have a anode bolted to the hull as close as possible with out fouling rudder movement, wired with a heavy stranded cable to the rudder quadrant on the inside. Under no circumstances bond this to the negative of the battery's, also switch all battery's off when leaving the boat. David

GrainDeSel Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 04 August 2013 Location: France Perros-g Status: Offline Points: 86	Post Options Post Reply Quote GrainDeSel Report Post Thanks(0) Quote Reply Posted: 23 April 2016 at 07:35
	Hi all My boat is H385#139, She is in the water since august 2012. This year I found galvanic corrosion on the rudder! No ground cable, no shore power, Jefa specifications for fouling are respected. ... See my post I am very desaponted http://www.myhanse.com/rudder-corrosion-protection_topic9558_post79587.html?KW=#79587 Best regards
	Best regards Jean-Marie H385#139 june 2012

bovine Members Profile Send Private Message Find Members Posts Add to Buddy List Commadore Joined: 18 November 2007 Location: United Kingdom Status: Offline Points: 405	Post Options Post Reply Quote bovine Report Post Thanks(0) Quote Reply Posted: 23 April 2016 at 08:19
	Hi Graindesel Have you identified the problem? You need to fit an anode, it is likely your rudder stock is grounded through your auto pilot or compass light. An anode will solve your problem David

BAJJ Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Joined: 18 May 2015 Location: Ireland Status: Offline Points: 45	Post Options Post Reply Quote BAJJ Report Post Thanks(0) Quote Reply Posted: 23 April 2016 at 09:48
	Thanks all, I think the issue may have been that all winter I had the boat connected to shore power to run a dehumidifier, research shows that this can be an issue, a galvanic isolator may solve this and I will look into fitting one before next winter. In the meantime I have painted the post and the top of the rudder with international trilux (same coating as for the sail drive) as per the instructions on the Jefa website. I also want to fit a hanging anode, I just do not know where to attach it, any ideas? Again thanks BAJJ

bovine Members Profile Send Private Message Find Members Posts Add to Buddy List Commadore Joined: 18 November 2007 Location: United Kingdom Status: Offline Points: 405	Post Options Post Reply Quote bovine Report Post Thanks(0) Quote Reply Posted: 23 April 2016 at 18:33
	Hi Bajj The anode needs to be connected to the rudder post ,best to bolt on hull and bond to quodrant. As for shore power for your dehumidifier make up a lead that plugs in to the pontoon post and just run it into the boat and plug in direct, therefore isolating the boat David

GrainDeSel Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 04 August 2013 Location: France Perros-g Status: Offline Points: 86	Post Options Post Reply Quote GrainDeSel Report Post Thanks(0) Quote Reply Posted: 23 April 2016 at 22:54
	Hi David Problem is not identified. Rudder is correcfly insulated from pilote, battery, and other metallic pieces! I am regarding to put an anode screwed on the rudder stock and directly on the sea when we are berthing. Many thanks and best regards
	Best regards Jean-Marie H385#139 june 2012

samuel Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral of the Fleet Joined: 26 December 2004 Location: United Kingdom Status: Offline Points: 2770	Post Options Post Reply Quote samuel Report Post Thanks(0) Quote Reply Posted: 24 April 2016 at 08:35
	Will the anode not pick up stray current from the other boats, or badly earthed electricity supplies, near you & lead them up the wire & on to your rudder shaft then back down into the water?? In other words will the anode corrode or will it actually do the opposite of what you want & attract stray currents Edited by samuel - 24 April 2016 at 08:41
	Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex



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