Cheapest cost to self-design & self-build a 45ft sailboat

Discussion in 'Boat Design' started by sailingrock, Dec 26, 2018.

  1. caboat
    Joined: Dec 2018
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    caboat Junior Member

    Polyurethane foam is flammable, yes. There are nonflammable foams available, for example http://www.avantigrout.com/images/stories/products/Product_Guide.pdf - their AV-280 Hydrofoam or AV-290 both have ~ 2000% expansion ratio. Here is AV-202 with only 600% expansion:


    Here is AV-280


    Also here is a video of a team putting a boat together in 3 days using aluminum and bending sheets together
    - the trick is to design it right in the first place.
     
    Last edited: Jan 1, 2019
  2. Angélique
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    Angélique aka Angel (only by name)

    That's only a bare hull, which by far isn't a boat yet, as was already said in post #20, and also in the bottom citation there.
     
    Last edited: Jan 1, 2019
  3. Angélique
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    Angélique aka Angel (only by name)

    It says . . . ‘‘ New construction method ’’ . . . ‘‘ No one has done this before ’’ . . . and more snake oil . . . :eek:

    Check 1981 patent US4282617A and the 5 drawings there, which are also to be seen in this PDF of the patent.

    Also the type of dart cutouts in the video and the hull shape look as bad as an old Brent Swain design, which can be much improved.

    And the wooden building jigs in the video aren't needed at all for the shown origami boat building method.

    Brent Swain long ago but after 1981 at the built of Sailing Vessel MOM

    ‘‘ Brent has developed a unique construction method that is called "origami" as the hull is "pulled" into shape. ’’

    Also snake oil, see the above linked 1981 patent . . o_O

    [​IMG]

    I do like however the Origami YAGO Project which is different in many details . . .

    [​IMG] - [​IMG]
     
    Last edited: Jan 1, 2019
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  4. caboat
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    caboat Junior Member

    Ideas are free, only execution matters.
     
  5. Angélique
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    Angélique aka Angel (only by name)

    True in this case, the idea has become free after the patent expired.
    Not true, it also matters when saying anything it's the truth, like e.g. about ‘‘ New construction method ’’ and ‘‘ No one has done this before ’’ and also the building time of the bare hull being presented as total boat building time is far from providing the truth, so that matters too in terms of reliability of the source.
     
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  6. CDBarry
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    CDBarry Senior Member

    A CNC aluminum 49 pax ferry 42' long with triple Bravo II out drives and a bow ramp took 1800 m-h of very experienced builders running 15 m-h / CIGRT. Most professional small builders run more like 35 - 45 m - h / CIGRT. An amateur working alone would probably be twice that at least.
     
  7. fallguy
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    fallguy Senior Member

    CIGRT?
     
  8. caboat
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    caboat Junior Member

    Must be some Baltimore acronym that has "time" in it :D
     
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  9. Mr Efficiency
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    Mr Efficiency Senior Member

    Even Google does not know about it. o_O
     
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  10. fallguy
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    fallguy Senior Member

  11. Angélique
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    Angélique aka Angel (only by name)

    From the context in which CIGRT was mentioned I'm thinking about a typo, maybe CICRT was meant, which means Cost to Income Ratio (also CIR), and is a term that comes from the banking and accountancy industry...

    How to Calculate a Cost-to-Income Ratio

    ‘‘ In accounting, the cost-to-income ratio measures the cost of running a business compared to its operating income. The lower the cost-to-income ratio is, the more profitable the company should be. It's a useful metric for gauging the efficiency of the operation. . . . . . . . . . . ’’

    Definition of cost:income ratio

    ‘‘ the cost:income ratio (or efficiency ratio) measures operating costs as a percentage of operating income. The ratio, which will vary across the bank, should be as low as possible (but not so low that it compromises customer service). Banks hope to reduce their cost income ratio as the business grows thanks to economies of scale. The idea is that additional revenue from existing or new customers has a relatively low cost associated with it and so is increasingly profitable. This is sometimes described as 'positive jaws' between income and expense growth - ie income grows faster than expenses, creating bigger profits. ’’
     
    Last edited: Jan 4, 2019
  12. fallguy
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    fallguy Senior Member

    Pretty sure the cube is
    LxBxD, length beam depth and the grt is gross tonnage.

    We'll need to wait and hear back.
     
  13. fallguy
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    fallguy Senior Member

    Compensated gross tonnage.
     
  14. Angélique
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    Angélique aka Angel (only by name)

    From the given context I'm still thinking something financial like operating expenses to gross income ratio, so the G could stand for gross, but can't fit that into the acronym right now, so agree we have to wait for CDBarry for the answer . . :)
     

  15. fallguy
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    fallguy Senior Member

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