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  • 13/05/2021 at 11:46 #24003
    Doug Odgers
    Participant

    I need to renew the anodes on A90’s rudder.

    It seems the blade is made of aluminium.

    Does this require any special anodes  or is the ‘bog standard’  zinc laden sufficient?

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    • 17/05/2021 at 10:02 #24043
      AOA
      Keymaster

      Doug

      I think you want a magnesium anode rather than the more usual zinc. They make themy specifically for aluminium rudders as large diameter profiles discs. Ed.2/6/21 This response is incorrect, with apologies, as magnesium is freshwater use only. Large disc zinc anodes should be used.

      Magnesium large diameter anode for aluminium rudder

      Available from lots of places. E.g Force 4 

      Cheers
      Nick

      • 31/05/2021 at 20:00 #24095
        Dominic Dobson
        Participant

        I thought magnesium was for fresh water use I used standard zinc discs on A90 when I had her

    • 17/05/2021 at 12:49 #24056
      Doug Odgers
      Participant

      Nick,

      Thank you for your excellent advice.

      Good job I asked !

       

      Doug

    • 04/06/2021 at 14:14 #24098
      AOA
      Keymaster

      Oh dear, I am really sorry to have misled you Doug. Dom is absolutely right. I allowed myself to become confused having just fitted magnesium to a boat on the broads. Looking again at photos of Helene’s rudder anode the apprear, as Dom says, standard zinc.
      I have edited my original erroneous reply to avoid misleading anyone else in the future.
      Many apologies
      Nick, on the naughty step

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