ranges for waterline area curve for cp 0.64-0.66

Discussion in 'Boat Design' started by mecmec, Aug 31, 2012.

  1. mecmec
    Joined: Aug 2012
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    mecmec Junior Member

    does anyone know the ranges? coz i left my book somewhere else. and i need the ranges so i can make my waterline area curve. thanks! cp0.64-0.66

    btw, the book is merchant ship design by munro-smith
     
  2. rxcomposite
    Joined: Jan 2005
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    rxcomposite Senior Member

    That Cp ratio range (0.664) is for Passenger, Cargo, Fruit ships (Lindblad & Todd). The Cp of 0.64 is for the upper range of destroyers. Quite a difference. I thought you were designing for a tug whose Cp is 0.59?

    The Cwp for a 0.664 is 0.78 and the formula for a Series 60 hull is Cwp= 0.18 + 0.86 Cp. and the Area is Awp= Length x Breadth x Cp.

    There are other method for plotting the waterline area curves.
    1. Taylors Mathemathecal Lines

    2. NSMB Mathemathecal Method

    3. Istanbul University Method

    The link was psoted in this forum sometime ago. About Taylors method.
     
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  3. rxcomposite
    Joined: Jan 2005
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    rxcomposite Senior Member

    Other Coefficients

    Waterplane Area Coefficient

    Cwp Equation Applicability
    = 0.180 + 0.860 CP Series 60
    = 0.444 + 0.520 CP Eames, small transom stern warships (2)
    = CB/(0.471 + 0.551 CB) Tankers and Bulk Carriers
    = 0.175+ 0.875 CP single screw, cruiser stern
    = 0.262 + 0.760 CP twin screw, cruiser stern
    = 0.262 + 0.810 CP twin screw, transom stern
    = CP 2/3 schneekluth 1 (17)
    = ( ½ CB/CM 1/2 )/3 schneekluth 2 (17)
    = 0.95 CP+ 0.17 (1- CP)1/3 U-forms hulls
    = (1+2CB)/3 Average hulls, Riddlesworth (2)
    = CB 1/2 – 0.025 V form hulls
     
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