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  1. #1
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    Default sheathing with veneers

    it's been 6 years so far, the hull is now 75% complete with a double layer of 5mm veneers, in that time 63 of the 128 ribs were repaired with scarfed/glued and screwed new sections, all floors removed/repaired/replaced glued and screwed back in, all through bolts in stem and stern removed repaired/replaced and refitted and glued back in. The hull was splined and new pieces scarfed into the planking where necessary. Why? because of a bad case of galvanic corrosion that ate away at the nails and destroyed the ribs around the nail holes. All that is missing now are the winning numbers in Lotto.
    The yacht in question is a Swanson Carmen. In 1984 shipwrights replaced the keel bolts with stainless steel and didn't put an anode on the ballast, bugger, absolutely ruined the boat.

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  3. #2
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    Default some nails

    examples of nails removed and compared to a new one.

  4. #3
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    South Oz, the big smokey bit in the middle
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    Default

    Quote Originally Posted by carmen View Post
    examples of nails removed and compared to a new one.
    You're not trying to suggest there's been some deterioration are you?

    Richard

  5. #4
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    'Delaide, Australia
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    Default

    That type of forced corrosion can happen for a number of odd reasons - and it is much more than stainless steel in lead.

    By the sound of the widespread damage sounds like a wiring problem forcing the electrolysis.

    There was also a trend in the 60s and 70s for strapping all the fasteners together with copper - which seems to have caused lots of problems by turning the boat into a battery. An anode on the outside would make it sortof work but there was so much metal joined up that the anode could disappear in a trice. Errant electric currents from wiring or shore power made it all much worse too.

    Congratulations on grabbing a Carmen though - wonderful boats - sounds like you are doing a nice job to keep a bit of history going too. Beautiful boats too.

    MIK

  6. #5
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    Default crevice corrosion

    Carmen was kept on a swing mooring always, her wiring is very basic, nothing was strapped at all, in 1984 the shipwrights decided she needed new keel bolts, removed the old monel bolts and threw them away [sob!] new 316 stainless was fitted along with a mild steel floor to take the thrust bearing for a new Yanmar engine, the floor was also fastened into the boat with stainless steel, no anode was fitted anywhere. The region of the mild steel floor required some new planking to be scarfed in as the timber around the stainless bolts had deteriorated badly, a new timber floor has now been glued and screwed in. Bruce McConkey from Boat Craft Pacific came down to have a look 7 years ago, his multimeter picked up 250 milliamps running through her, hence the reason to get her out of the water.
    Heres a shot of crevice corrosion in a 3/4 inch 316 ss keel bolt.

  7. #6
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    Default

    Textbook example Carmen - just beautiful.

    Stainless steel with no air to build a protective oxide layer.

    Great shot.

    MIK

  8. #7
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    Default rolling over

    ready to roll her over, nervous who me?
    she weighed 1800kgs stripped out and ballast free, will be interesting to see how much weight has been added when we turn her back over, not a creak nor a groan as she turned.
    aaah the love of my life. almost.

  9. #8
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    Default sheathing

    spiling has been the main challenge, particularly in the middle of the boat with all the curves and longer timbers and one pair of hands only, there were times when one wished for the Hindu god Ganesh with all his arms to come and help. The starboard side has commenced.

  10. #9
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    Default

    That's a magnificent piece of work, and a patient labour of love by the look of it!

    What are you using for temporary fastenings while the epoxy sets? Looks like yellow packing tape and... staples?

    Given the lack of help from Ganesh, you must have worked out some nifty techniques for holding the strips in place while spiling. Have you done each strip individually?
    Cheers,

    J

    ....

    Data isn't Information, Information isn't Knowledge, and Knowledge isn't Wisdom!

  11. #10
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    Ganesh is the remover of obstacles. Any boatbuilding that has got to this stage has required overcoming many.

    So one can only surmise that Ganesh has been quite active in this case!

    MIK

  12. #11
    Join Date
    Mar 2004
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    Kettering, Tasmania
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    Default

    Carmen,

    What was the rationale behind sheathing? Was the planking buggered or just the fastenings? What sort of timber was the planking? if just the fastenings, why not just refasten? What was your thought process?

    AD

  13. #12
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    Default

    Quote Originally Posted by onthebeachalone View Post
    That's a magnificent piece of work, and a patient labour of love by the look of it!

    What are you using for temporary fastenings while the epoxy sets? Looks like yellow packing tape and... staples?

    Given the lack of help from Ganesh, you must have worked out some nifty techniques for holding the strips in place while spiling. Have you done each strip individually?
    I am on my 3rd kilometre of packing tape and can't remember how many staples I have used so far, have all the receipts so one day I can see exactly how much I spent and on what. The stapler is a Bosch electric and has been excellent for the job, I used 14mm staples and the packing tape is doubled over, when the glue sets I just roll the tape out with pliers and it removes the staples which are mild steel.
    Yes each strip was done individually and in the body of the boat is an utter pain, I have a ply template with 45 degree angles on it, sit it on the horizontal strip which runs the length of the boat on the deck line and pencil in where the plank should lie and start planing, because the planks are to long for one man to handle I also have to scarf them together. Each strip was lightly tacked in place as I went along to ensure the best fit possible.

  14. #13
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    Default

    Quote Originally Posted by bloggs1968 View Post
    Carmen,

    What was the rationale behind sheathing? Was the planking buggered or just the fastenings? What sort of timber was the planking? if just the fastenings, why not just refasten? What was your thought process?

    AD
    The planking is oregon and it was fine, however each nail hole was drilled out and a plug glued in as the timber around the nail was suspect, the nails themselves were ruined, refastening was not an option as the timber in the ribs around the old nails didn't even have the strength of a good carrot. The section of rib in the photo I accidently snapped just fiddling with it.

  15. #14
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    Default

    Looks good
    One question, why are the strips so narrow, I would have thought they could have been 100mm at least particularly the flat sections?
    Scotty

  16. #15
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    Default

    two reasons, number one, the first load of lumber came from a sheathing project and were the leftovers, sufficient to do the complete hull once, nice gift, but, on the tighter turns of the hull were difficult to bend to the appropriate shape, hooray for the heat gun, also as I was covering a curved object in the tighter horizontal curves the timber could not mold to the shape and a series of flats were occuring.
    Second the 50mm timbers were much easier to work on all curves and were much much cheaper to buy as the flitches come in 50mm thickness so they were simply sawn at 5mm and as a result were quarter sawn and for what it's worth are stronger.
    In the attached photo the starboard side has been started and the wider veneers of the first layer can be seen.

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