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Amateur designer seeking information

Discussion in 'Yacht Designers Discussion' started by Danio, May 9, 2016.

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  1. Danio

    Danio New Member

    May 8, 2016
    Good morning to every member of this forum!
    This is my first post on this forum and I've just done the registration in order to open this thread.
    I'm no professional designer, i'm just a guy who recently got interested in yacht world, and in my free time I started figuring my dream yacht and besides not having the technical knowledge to design it perfectly, I'm trying to make it as realistic as possible!
    Since now I've cleared many doubts by using google or looking to different specs and layout on true finished yacht, but I'm now at a point where an hand from more experienced designers is necessary!

    To keep this simple, i'm just asking in this post few questions on measures and dimensions: forgive if I make errors or i don't know all the correct terms but english is not my mothertongue and ship parts are not words that are taught commonly :)

    Actually my yacht is a LOA 62,5 m (205 foot) displacement yacht with a full beam of 10,8 m. These dimensions seem right to me after i've confronted them with specs of many models on the market.

    1) My first questions is about the beam: how is usually intended beam on online brochures and specs?
    I've found many definitions that say that the beam has to be measured at the waterline:
    In this case by observing the shape of most of the ships you can be sure that above the waterline the hull gets a bit wider until "main deck floor level" meaning more space for decks, but how much can i expect it to be wider?

    In another spot on the internet i read that the term "beam" commonly used on websites is referred as the maximum width of the ship at "main deck floor level", and because the hull restricts toward the bottom we'll have less space in the lower deck. And also in this case i would ask: "How much do i reasonoably have to expect?"

    2) How much would "tickness" of the hull in the lower deck in this kind of yacht ? i intend the metal plates that separate the inside from the outside like traditional walls, i hope you get what i mean.
    I've seen in every layout that it varies from stern to bow and not progressively (it's not always increasing or decreasing)

    3) How high can be the lower deck? I mean from floor to ceiling since i don't know if the lower deck floor coincides with the waterline or it's above/below it.

    for now is all i need to know, thank you in advance for your attention!
  2. AMG

    AMG YF Moderator

    Jul 26, 2004
    Hi Danio,

    1) I guess you are not designing in 3D, but anyway you should draw the frames so you know the shape of the hull. With frames I mean what you see if you slice the boat in sections like sliced bread. You can make one every meter to make it simple and also use them to position most of the bulkheads. The maximum beam is usually midships at deck level, the beam at the waterline can be almost the same at midships but less towards the ends, depending of the style of boat.

    2) The thickness of the steel varies from the keel and up, but not that much that you have to think about it when you do the interior. But you can take away about 100 mm for insulation in most areas.

    3) The interior height normally gets up with the size of boat so on a 60 meter yacht you should probably have at least 2300 mm from floor to floor, including space for spotlights and wiring.

    Are you designing on paper or using a 2D drawing program? With a program like Freehand or Illustrator it is very simple to change things as you go along...
  3. Danio

    Danio New Member

    May 8, 2016
    Than you for your answer!
    At the moment i'm using an interior design software which is not specifical for boats: right now i'm just working with rectangular block, desiging them in a way they could be inserted into a real hull (this is why i asked the beam and the thickness, if i know the beam at floor level on a certain deck is X and the hull is Y thick, i can assume i will have X-2Y as width for my interiors.
    At the moment I don't have the knowledge to manually shape a hull because i lack physics, hydrodynamics ecc so i just know that the maximum beam will be 10,8 m and it will be a bit less at stern and will point toward almost 0 at bow's tip. 've already calculated that 7,5 meters of 62,5 will be unaviable in the lower deck by confronting many layouts,

    I'm actually looking for a program that can give me better control on interior design with the capability of creating a realistic hull and boat structure (automatically, as i said i don't have the required knowledge to shape a boat that could actually go on sea)
    untill i find it (and i would appreciate some suggestions in that matter) i'm working as i would on a regular home trying to understand what the real restrictions could affect my work.

    You really think that an average of 10 cm for each side is enough? i made an approximate calculation using layouts and on lower deck thickness of the outer parts of the hull looked like 25-30 cm at stern and almost the same till 3/4 of the entire lenght of the boat.

    3) that can be a problem: i don't like yachts that raise to high from the water line because you loose contact with the sea itself.
    So i actually want to keep it low, but my design so far impose me to have at least 3 m from floor to ceiling on a third of the lenght of the ship.
    In this particular case, i'd like to have a disco room in my yacht and the lower deck is the perfect spot to have it imho:
    you don't get as much light as you would get on main or upper deck, but you don't need natural light at all in a disco...
    The engine room is noisy and rooms next to it become noisy too, but if you are staiyng in a disco club the music will be on and so the problem is solved.
    Vibrations and noises made by people's steps spread more through the floor than through the ceiling, but there's nobody in the tank deck.

    It is the best possible place for a room like this, but 230 cm height is actually to low :S