Hi and shaft log question

Discussion in 'Boat Design' started by OwenC, Oct 2, 2012.

  1. OwenC
    Joined: Oct 2012
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    Location: UK

    OwenC New Member

    Hi chaps,

    I'm just beginning the restoration of a 1941 British Powerboats MASB (whaleback). Plenty of work to be done but fortunately we've already restored a similar craft already.

    Quick question tho, all the hardware has been removed incl stern gear. Is there any reason I couldn't make the shaft logs and rudder stocks from stainless?


    Apologies if this is the wrong section...


    Cheers,

    Owen


    [​IMG]
     
  2. CDK
    Joined: Aug 2007
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    CDK retired engineer

    Of course you can make these parts from stainless steel.
    It does cause some galvanic current between these parts and other metals in the water but you will surely use zinc electrodes so that's not a problem.
     
  3. FAST FRED
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    FAST FRED Senior Member

    I couldn't make the shaft logs and rudder stocks from stainless?

    You could but it might be dangerous to place the boat is sea water.

    SS is grand for hand rails and cleats , underwater NO WAY!

    Good Bronze of a marine type, is best bet.
     
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  4. CDK
    Joined: Aug 2007
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    CDK retired engineer

    You should think about that a little longer Fred.
    ALL outboards and stern drives on this planet have stainless shafts, fasteners, bolts, props etc. My own tunnel drives have exposed stainless stern tubes, shafts and rudders, just like some of the expensive surface piercing drives. After 5 years in one of the most saline seas on earth there is no sign of corrosion.
     
  5. OwenC
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    OwenC New Member

    Thanks CDK, saves me a load of hassle trying to track down some cast ones that will suit! Any particular grade or will 316 do?

    I'm sure i'll have plenty more questions to follow.
     

  6. CDK
    Joined: Aug 2007
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    Location: Adriatic sea

    CDK retired engineer

    SS-316 is excellent, but make sure you get what you pay for. In this country 316 is marked in blue, 304 in green, but for short pieces you have to trust the supplier.
    When in doubt, use a magnet.
     
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