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Post by spidercrab on Sept 20, 2012 9:45:38 GMT
What's the best solution for a boat that is moored at the club for the bulk of its time? Possibly about 90% of time in the Bay.
I have read many online opinions, but as our situation is somewhat unique I was wondering what most people in the club do?
I have heard that a zinc sea anode will become ineffective with prolonged "fresh" water immersion and I can imagine that an extra dipping anode will be one more thing to forget to deploy or one more thing to get tangled up, etc.
Could you have 2? I.e. normal zinc hull mounted and a magnesium collar on the propshaft?
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Post by spidercrab on Sept 20, 2012 20:37:54 GMT
I spoke to one of the guys at Force4 today. He said that the Aluminium one for brackish water is the one best suited for a boat moored in Cardiff Bay.
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Post by allan on Sept 20, 2012 22:18:25 GMT
I contacted M C Duff a couple of years ago and decided the best setup was an Aluminium one with a Magnesium one for when on the mooring.
It is funny that when I went to Force4 for the Aluminium one they said use Zinc! When I said I had been in touch to M C Duff they went very quiet.
Allan
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Post by spidercrab on Sept 21, 2012 8:52:01 GMT
The guy at Force4 said that they base their advise on what they have heard back from boat owners with boats moored in the bay. Not very scientific I know but useful.
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Post by allan on Sept 21, 2012 11:08:07 GMT
The science involved is very complex and way beyond me. The bay is more complex than most. There are sensors in the bay which are supposed to check salinity but the minerals coming down the rivers seem to upset them. I looked once and found the salinity was much higher in the Taff and Ely than in the bulk of the bay. The sensors can be seen here: www.ysieconet.com/public/WebUI/Default.aspx?hidCustomerID=173Normally, Zinc is used for seawater, Magnesium for fresh water and Aluminium for brackish or a combination seawater and freshwater. M.C.Duff seemed to think the Bay is brackish but the harbour authority are obliged to keep it as freshwater and seem to do a good job. Allan |
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Deleted
Deleted Member
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Post by Deleted on Sept 21, 2012 14:14:06 GMT
I have used aluminium for the last 2.1/2 years and it seems to corrode quite nicely. I scrape off the crud whenever we dry out to expose new metal.
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Post by spidercrab on Sept 27, 2012 9:54:03 GMT
I have used aluminium for the last 2.1/2 years and it seems to corrode quite nicely. I scrape off the crud whenever we dry out to expose new metal. That's really good to know. Thanks. |
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mike
Member of CYC 
Redeye
Posts: 20
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Post by mike on Sept 27, 2012 10:59:39 GMT
Since being based in the bay I have used: Zinc= Almost no loss, Aluminium=Fizzed away nicely. Couldn't buy a aluminium shaft anode in force 4 though?
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Post by spidercrab on Oct 22, 2012 8:17:24 GMT
I noticed that in the CYBC Spring 2012 Newsletter ( www.cbyc.co.uk/club/documents/besp12.pdf) in the Sailors' Question Time was the following: "WHAT SORT OF ANODES SHOULD WE BE USING? AF: A lot of people in the Bay are using aluminium. It’s a little early to make true comparisons because until recently all aluminium anodes went to the American market. I’ve heard people say they sailed to Watchet and their anode disappeared in a weekend but that might just be something in the area. Aluminium is looking a good bet and you should get a season out of it." |
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