Affordable seaworthy cruiser

Discussion in 'Boat Design' started by goodwilltoall, Jul 31, 2010.

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  1. frank smith
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    frank smith Senior Member

    How about getting a big weather balloon and a cover it with spray foam , and then epoxy and glass . I know that the shape is different than what you want,
    but it would be strong and unsinkable.
     
  2. mydauphin
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    mydauphin Senior Member

    Ancient designs

    A pyramid shape boat would be very stable and impossible to capsize. Of course I mean a upside pyramid. It would also be very strong and symbolic to someone. Lets all go out and build them.. Oh they are hard to navigate and their draft makes them impossible... Oh it doesn't matter because the proportions are good.

    Goodwiltoall some questions for you;
    Why did Fiberglass revolutionize boat construction ?
    Why do Naval engineers study physics, fluid dynamics and many hard sciences to design a functioning boat?
    Why does the Coast Guard rescue ten of thousands of boaters every year?
    How is it that even well built, multiple hundred foot vessels flip over and sink?
     
  3. wardd
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    wardd Senior Member



    Why did Fiberglass revolutionize boat construction ?

    Panes of glass kept breaking

    Why do Naval engineers study physics, fluid dynamics and many hard sciences to design a functioning boat?

    because they are nerds and couldn't get dates in school


    Why does the Coast Guard rescue ten of thousands of boaters every year?

    because they have a lot of money to spend

    How is it that even well built, multiple hundred foot vessels flip over and sink?

    because they were in the water
     
  4. mydauphin
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    mydauphin Senior Member

    Everyone is a comedian...
     
  5. kerosene
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    kerosene Senior Member

    The level of skills varies though :D
     
  6. wardd
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    wardd Senior Member


    Hey, it's late and that was the best i could do.
     
  7. mydauphin
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    mydauphin Senior Member

    Actually Wardd it was funny, but I wanted to see goodwill answers.
     
  8. waynep
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    waynep Junior Member

    I think this is a very important statement. A 50 FT boat is very large for a first project, especially if you are working alone without help from an experienced boat designer and builder.

    How do you plan on coming up with the correct numbers for the structural members for a boat this size? Are you using Scantlings? You would surely need the assistance of a Naval Architect and Professional Boat Builder, otherwise, the boat would be dangerous to yourself and your crew :!: .

    These statements assume that you are new to designing and building boats.
     
  9. peter radclyffe
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    peter radclyffe Senior Member

    scantlings would be handy, unless of course you join the magic circle
     
  10. goodwilltoall
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    goodwilltoall Senior Member

    Greetings,

    Change from leeboard to full keel drawings.
     

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  11. goodwilltoall
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    goodwilltoall Senior Member

    Kerosene,

    Post 167: Your right that some qualities mentioned are thought to be higher magnitude than they really are, just wasnt sure if those where looked over because the design is to different to most eyes.

    The current boat in possesion is a Tartan 27, and not to many sailing hours.

    Frank,

    Box girders are extremely strong.
     
  12. Eric Odle
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    Eric Odle Tugboat Mariner

    Looking like a boat! Have you considered softening that chine?

    Also have you considered "junk" rigs? It would simplify the masts a great deal to have an unstayed rig. One fellow I met at Hornby Island in the PNW basically found his masts on a beach. Another used a set of aluminum light poles, and sailed his craft all around the Pacific. Not the best upwind, but with your intended shoal-draft keel you probably aren't expecting perfection in that area. Lots of reefing options!
     
  13. goodwilltoall
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    goodwilltoall Senior Member

    Greetings,

    Eric, like the ideas just that junk rigs are not available used, read Brent Swain book and it makes alot of sense to find marconi sails. The size of the project is big enough and dont need more work. If decent sails can be bought used, will go that route and forego learning how to make my own. People often say that the equipment can be bought for $300.00 to make your own but they always seem to have problems.

    As mentioned before the real problem is the sail propulsion design and will limit discussion on the hull. Looked over AS39 details again, amazing that Bolger so ridiculed often, that boat a clearly amazing. It had 12" draft and was found to be a good seaboat, to argue that it cant be done goes against proven knowledge and experience.

    AS39 had 3000lbs. ballast, comparing waterplane means jubilee should be somewhere at about 4500lbs. The masts are hoped to be freestanding and is it possible to still use lacing line to attach marconi sails to them.

    Post 167: The boat is not light. It is designed for displacement at 14,500lbs. with possible heavyload at 18,000lbs., this takes into consideration what is needed and nothing more, no reason for it to be heavier than it has to be to satisfy some arbitrary opinion.
    The T27 is 7400lbs displacement with good seagoing qualities. So another boat that is twice as long with similar beam and twice the displacement to say its light weight does not make sense.
     
  14. Pierre R
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    Pierre R Senior Member

    Seaworthiness is all relative and with no knowledge of the sea all boats sound the same. THEY ARE NOT.

    THE T27 DOES NOT HAVE THE SAME BEAM AT THE WATER LINE AS YOUR CONTRAPTION. THE UNDERWATER LINES ARE NOT EVEN CLOSE.

    You are either a troll of do not care to learn.
     

  15. apex1

    apex1 Guest

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