sail boat design

Discussion in 'Sailboats' started by coastalrb, Dec 28, 2012.

  1. coastalrb
    Joined: Dec 2012
    Posts: 9
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Clinton ct

    coastalrb Junior Member

    I am looking for dimensions and specifcations for any 30 ft sailboat
    nominal sail area,
    wetted area of hull
    displacement length ration
    slenderness ration
    stability index
    need info to compare to what i want to design
    Robert
    Do designers have to register their designs with a government agency for insurance and building purposes.
    Is there a data base of sailboats i can acess for these spec.
     
  2. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 474, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Welcome to the forum. Are you attempting to self design a 30' sailboat?
     
  3. coastalrb
    Joined: Dec 2012
    Posts: 9
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Clinton ct

    coastalrb Junior Member

    Yes

    Yes. I have been reading anything i see with boat design. I have five books I have been reading over and over. I am a sketcher and pattern maker by trade and want to calculate a table of offsets of my own. the lofting will be the easy part. I have recently figured out Simpsons Rule. Scantling rules are still a mystery.
    Robert
     
  4. gonzo
    Joined: Aug 2002
    Posts: 14,461
    Likes: 642, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    You can go online and look at the specifications of hundreds of boats in that range. I think the variation is probably in the order of 500% or so. You can make an average, but it will be meaningless.
     
  5. michael pierzga
    Joined: Dec 2008
    Posts: 4,862
    Likes: 115, Points: 0, Legacy Rep: 1180
    Location: spain

    michael pierzga Senior Member

  6. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 474, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Ratios and rules of thumb will not help much in the design process. There's really no way around the education aspect of the process, in regard to self designing a 30' yacht. Which books do you have and how well have you grasped the concepts and principles?
     
  7. coastalrb
    Joined: Dec 2012
    Posts: 9
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Clinton ct

    coastalrb Junior Member

    how do you carve an elephant

    I am look for spec because the book i am reading want you to be familiar with boats in that class so you have something to measure against.

    Book:
    Principles of Yacht Design by lars Larsson
    Elements of Yacht design by Skene
    Preliminary Design of Boats and ships byCyrus Hamlin
    The art Science of Cruising Boat Design byDanny Greene
    How to Design a Boat by John Teale

    I am creating a lines drawing to get familiar with the process on generating fair lines and using math to generate some number and ratios like displacement.

    I know i don't need the spec of other boats per say but I am trying every thing i can

    I have to get some copenhagan curves next.
    Robert
     
  8. kvsgkvng
    Joined: Jan 2012
    Posts: 212
    Likes: 8, Points: 18, Legacy Rep: 49
    Location: *

    kvsgkvng Senior Member

    IMHO the more you read the more you will realize that in traditional sailboats, most has been already done to death. Slight variation of one inch this way or that way would not worth your time spent. We don't have this time in unlimited quantities.

    I think the best practice for new sailors is to
    (a) of course learn the design,
    (b) observe existing used boats,
    (c) purchase one which you think is good and
    (d) spend your time licking it to your liking so it looks good to you.

    Unless you have time, money, tools, place and will to do it yourself and then realize that you made a mistake or two...

    Just MHO
     
  9. Landlubber
    Joined: Jun 2007
    Posts: 2,640
    Likes: 124, Points: 0, Legacy Rep: 1802
    Location: Brisbane

    Landlubber Senior Member

    kvsgkvng,

    That , my friend, is very sound advice.......but I doubt anyone is listening......such is life
     
  10. sharpii2
    Joined: May 2004
    Posts: 1,932
    Likes: 128, Points: 63, Legacy Rep: 611
    Location: Michigan, USA

    sharpii2 Senior Member

    What would you do with this 30 footer?

    Would you cruise? Daysail? Race?

    Where would it be used? In shallow coastal areas? deep blue water? Crowded harbors? Lonely stretches of beach with no facilities nearby?

    Where would it be kept? In your back yard? At a marina? On a mooring?

    The more honestly you answer these questions, the more likely you are to at least reach a starting point in your design process.

    Once these questions are answered, you will then be narrowed down to a more limited number of types.

    Say you're going to want to keep your boat in your back yard. That will limit its Beam, so it can be legally trailered without special permits. It would probably also have some sort of retractable keel or 'board' (center board, leeboard, or dagger board), so you will be able to get it on the trailer.

    This is just one example.

    Once you get your 'types' narrowed down to a reasonable number, then you can compare ratios with other boats of the 'types' you are considering.
     
  11. CutOnce

    CutOnce Previous Member

    It seems people have to learn things the hard way, and once their scar tissue heals over they sagely dispense the same advice they had been freely and repeatedly given before they became fonts of wisdom.

    --
    CutOnce
     
  12. michael pierzga
    Joined: Dec 2008
    Posts: 4,862
    Likes: 115, Points: 0, Legacy Rep: 1180
    Location: spain

    michael pierzga Senior Member

    Hey...nothing wrong with messing around with boat design.

    The more you practice, the smarter you get. Any boat owner would benefit from an understanding of the terms and techniques.

    Without knowledge you would be left to the mercy of yacht brokers and marketing types when choosing a boat.
     
  13. kvsgkvng
    Joined: Jan 2012
    Posts: 212
    Likes: 8, Points: 18, Legacy Rep: 49
    Location: *

    kvsgkvng Senior Member

    I still "design" sailboats, I just don't publish them anymore. ;-)
     
  14. Grey Ghost
    Joined: Aug 2012
    Posts: 194
    Likes: 9, Points: 0, Legacy Rep: 94
    Location: california

    Grey Ghost Senior Member

    The history of mankind in 36 words :)

    no
    only third party and basic stats, no government database
     

  15. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 474, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    It depends on the type of service the yacht will be employed in. In some cases, yes, the design and/or the designer must pass certain requirements.

    A list of a few thousand production sailboats and their basic dimensions can be found at www.sailboatdata.com
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.