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Displacement Hull Draft

Discussion in 'General Trawler Discussion' started by clnewman, Feb 14, 2007.

  1. Garry Hartshorn

    Garry Hartshorn Senior Member

    Joined:
    Jun 14, 2005
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    Location:
    Directly above the center of the earth
    A vessel designed by any well known and respected designer has been thoughly thought out, calculated and they know within a very small percentage of how it is going to handle and perform. As long as it is built as designed it's not something I would worry about too much. If you do have concerns ask the designer to show you his stability calculations and explain them.
  2. tri - star

    tri - star New Member

    Joined:
    Feb 6, 2007
    Messages:
    32
    Location:
    Vancouver, B.C., Canada
    To clnewman,
    we seem to be basicaly, in agreement.

    50 odd years ago, S & S enjoyed a fairly solid rep.
    Which is not an absolute guarantee that - they
    are on top of their game today.

    There is a direct relationship between draft and
    displ. - so there still, might not be a concern here.
    As; one reason for, perhaps, a bit of honest
    confusion is:
    - The more trad. designer will show the deepest
    part of the hull, proper. - As a first concern.
    - Whereas, a company brochure, might only
    indicate the lowest point of the rudder(s) and
    other paraphenalia. Which can vary considerably
    from the built form of the vessel it's self.

    If it was, indeed my nickel - there are a few
    questions that merit a reply:
    i.e.
    How much is the company involved
    - marketing driven ?
    As molds are expensive, are they trying to reduce
    the debt incurred, as fast as possible ?
    By selling # 2, even before, # 1 has hit the water ?
    Trading on the reputation of said, well known designers.
    Who can do no wrong ?

    It follows: that you are likely, certainly not alone;
    in your caution.
    So, any broker(s), if they indeed are,
    in a rush to move # 2
    - will be experiencing a bit of frustration right now,
    moving these vessels.Especialy, with sophisticated buyers......

    Actually, the question I'd most want an answer to is:
    Where's the demonstrator ?!
    Before computers - it was common practice to make a
    wooden prototype. After successfull sea trials - the
    wood boat became a male mold. Then female molds were
    taken off the results.
    Before going into full, fiberglass production.
    Then; in a third role - the prototype
    - is quickly put into service.
    - As a demonstrator. A most effective sales tool.
    If it's a good boat.
    It's been said,
    " That computer aided design - can result in worse
    boats - than before.
    - Just built faster."
    From what you report - steps, that I have found useful
    in the past - might have been skipped.....?
    By going directly from computer into production.
    The builder saves lots of risk capitol - and then,
    in effect, asks you to run their test program.
    So a reduced price - is in actuallity
    - a way to compensate you for this work.
    Perhaps......?

    ' Regards !