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  1. #1
    Join Date
    Aug 2011

    Smile Design ratios for motoryacht?

    Hi. I would like to know what are the design ratios that are being used for motor yacht design. And also formulas for obtaning/determining the legnth, breadth, detp of motor yachts

  2. #2
    Join Date
    Jul 2009


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  3. #3
    Join Date
    Aug 2002
    Western Scotland


    Peter's answer is all too correct, but as I assume that you want a more factual response, I will have a stab at it. It would be useful to know what lies behind the question however;

    what is your starting point? (ie what do you already know?)

    why do you want the information? (if you are about to design a motor yacht, you will need much more info than you will get here.)

    You ask about "ratios" do you mean design FACTORS?

    Length will depend on desired use and accomodation.

    Breadth is typically close to length/3.

    Draft depends on hull form and intended displacement. A V-bottom boat will have greater required draft (all else being equal) than a flat bottom.

    After that, I would need to know more of the reasons as described above. Finally, my own area of experience is sailing dinghies, pulling boats and small motor boats. I merely quote above some rules common to all of these. You may also be better posting on the Motor Boat Forum.

  4. #4


    i see because my thesis is a motoryacht. i'd like to remodel my yacht because i'm not satisfied of my CB it's 0.36 it came from my parent ship....

  5. #5
    Join Date
    Jan 2013


    Basic dimensions for yacht design are such that:

    Rig Dimensions = I, J, P, E, etc.

    Boat Dimensions = LOA, LWL, B, Disp, etc.

    Size of Sails = LP, Area

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