Two On A Big Ocean The Story of the First Circumnavigation
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[world-cruising] Steel Vessels Construction Techniques

From: theluckyswede (no email)
Date: Thu Jul 03 2003 - 00:33:20 EDT

  • Next message: AlaskaTrawler: "[world-cruising]"

    In purchasing a steel vessel of any kind (sail or power ) there are
    some
    very important things you should know. The first thing is in my
    opinion over
    all else is how corrosion has been managed. In my view it would be a
    plus if
    the vessel had been sprayed with urethane foam from the time it was
    constructed. In my view foam is the greatest extender of life of a
    steel
    hull. First it completly seals off moisture and oxygen from the
    steel. Rust
    can't begin unless those two element are present. Further it fills
    all voids
    where water can sit and begin the corrosion process process. The type
    of
    foam you use is also important. Using a 3lb closed cell foam in the
    bilge
    will give you a very impervious coating to any kind of air or water
    penetration. It is normally applied to complete exteriors of homes in
    arctic. As far as checking the condition of the steel under the
    foam.....that is hard to do without actually chiseling out a section
    and
    looking at the steel. If the vessel is old and the foam recently
    applied
    then I would worry about it.Sounding the hull? I think if the vessel
    is well
    cared for and shows no signs or very little signs of corrosion I
    would not
    worry about it. You can't put foam everywhere so look around the
    stern tube,
    down under the water tanks if you can, If all looks well the boat
    should be
    in good shape. If not sure hire a marine surveyor knowledgeable of
    steel
    vessels.
    As far as magnetic interference with your compass. Most steel vessels
    use a
    special compass with a magnetic sphere located on each side of the
    compass
    to correct the deviation caused by the steel hull. There are many very
    reliable electronic compasses that are not affected by the steel hull
    and
    therfore work very well also. I plan on installing an electronic
    compass by
    Simrad and using the helm compass for redundancy.
    As far as how your compass will behave in your binoculars I can't
    answer
    that. I suppose it would be affected to some degree.

    Regards
    Dan Walsh
    Building MV Spirit Of Balto
    www.alaskatrawler.com

    From:
    "edmdgd" <>
    To: <>
    Sent: Tuesday, July 01, 2003 3:42 PM
    Subject: [world-cruising] Steel Boat Purchase

    > Opinions from the Group please
    >
    > I have always in the past owned Fiberglass boats. I am contemplating
    > a long term cruise with a new vessel preferably of steel (new to me
    > that is). As some of the boats that I am looking at are out of the
    > country (USA) I am a little wary of the process. May I ask your
    > opinions on what to look for. Is sounding necessary?.What does
    > sounding cost?. Is repair on an Origami (frameless) as easy to
    repair
    > in out of the way places as the framed boat design. How is metal
    > condition under sprayed foam evaluated?. Am I correct in assuming
    > that the compass in my binoculars will no longer act appropiately?.
    > Hand bearing compass same problem?. I am sure I have many more areas
    > of concern but maybe your answers will cover them.
    >
    > Thanks
    > Gerad
    >
    >

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