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    01.coefficient of Finess

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    1. The document defines coefficients used in ship design including water plane area coefficient (Cw), midship area coefficient (Cm), block coefficient (Cb), and prismatic coefficient (Cp). 2. It provides formulas to calculate displacement, ton per centimeter (TPC), wetted surface area, and other ship parameters using the defined coefficients. 3. Examples are given to calculate various coefficients and parameters for ships given dimensions, displacement, area coefficients and other specified values.

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    01.coefficient of Finess

    Uploaded by

    Par Oo
    751 views3 pages
    1. The document defines coefficients used in ship design including water plane area coefficient (Cw), midship area coefficient (Cm), block coefficient (Cb), and prismatic coefficient (Cp). 2. It provides formulas to calculate displacement, ton per centimeter (TPC), wetted surface area, and other ship parameters using the defined coefficients. 3. Examples are given to calculate various coefficients and parameters for ships given dimensions, displacement, area coefficients and other specified values.

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    Coefficient

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    01.Coefficient of Finess

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    1. The document defines coefficients used in ship design including water plane area coefficient (Cw), midship area coefficient (Cm), block coefficient (Cb), and prismatic coefficient (Cp). 2. It provides formulas to calculate displacement, ton per centimeter (TPC), wetted surface area, and other ship parameters using the defined coefficients. 3. Examples are given to calculate various coefficients and parameters for ships given dimensions, displacement, area coefficients and other specified values.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    751 views3 pages

    01.coefficient of Finess

    Uploaded by

    Par Oo
    1. The document defines coefficients used in ship design including water plane area coefficient (Cw), midship area coefficient (Cm), block coefficient (Cb), and prismatic coefficient (Cp). 2. It provides formulas to calculate displacement, ton per centimeter (TPC), wetted surface area, and other ship parameters using the defined coefficients. 3. Examples are given to calculate various coefficients and parameters for ships given dimensions, displacement, area coefficients and other specified values.

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    © All Rights Reserved
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    COEFFICIENT OF FINESS

    Ton per cm(TPC)


    AW . S
    WATER PLANE AREA TPC=
    Aw= L.B.Cw 100

    MIDSHIP
    WETTED SURFACE AREA
    AREA
    S= 1.7 L.d+ Am=B.d.Cm
    d

    1. Aw = L.B Cw ,Cw = water plane coefficient


    2. Am = B.d Cm , Cm = midship area coefficient
    3. = L.B.d Cb , Cb = block coefficient
    4. displacement(W) = s. L.B.d. Cb (ton) s=density of sea water= 1.025 ton/m3
    Cb
    5. prismatic coefficient(Cp) =
    Cm
    Aw . s
    6. TPC = (mass to be added to sink down by 1 cm)
    100
    L .B .d .C b
    7. Dennys formula, Wetted surface area(S) = 1.7 L.d + = 1.7 L .d +
    d d
    S = 1.7 L.d + L.B.Cb

    01. A ship 150 m long and 20.5 m beam floats at a draught of 8 m and displacement of 19500 ton.
    The TPC is 26.5 and mid ship section area Coefficient 0.94.Calculate the block , prismatic and water
    plane area coefficient.(0.7734, 0.8227, 2585.3659 m2)
    given; L=150 m, B=20.5 m, d=8 m, W= 19500 ton, TPC= 26.5 ,Cm= 0.94
    to find; Cb=?, Cp=?, Cw=?
    Working; W = s.L.B.d.Cb
    W 19500
    Cb = = =0.7733
    s .L.B.d 1.025 x150 x 20.5 x 8
    C b 0.7733
    Cp= = =0.8227
    Cm 0.94

    Aw x s 100TPC 100 x 26.5


    TPC= Aw = = = 2585.3659 m2
    100 s 1.025
    Aw =L.B.Cw
    Aw 2585.3659
    Cw = = = 0.8408
    L.B 150 x 20.5
    02. A ship having 120 m long, beam 15 m at draught of 6 m has block coefficient of 0.8 and midship
    area of 81 m2.Find (1) displacement (2)prismatic coefficient.(8856 t, 0.8888)
    03. A ship having length 125 m, beam 20 m, draught of 6.4 m has block coefficient of 0.8 and
    midship area of 121.6 m2. Find (1) displacement of ship (2)prismatic coefficient.(2050 t, 0.8421)
    04. A ship 135 m long, beam 18 m, draught 7.6 m has displacement of 14000 ton. The are of load

    wa ter plane is 1925 m2 and the area of the immersed mid ship section 130 m2.Calculate(a)Cw(b)Cm (c)

    Cb(d) Cp.(0.7922, 0.9503, 0.7396, 0.7783)

    05. A ship having displacement 8856 tons has block coefficient of 0.8 and mid ship section area of
    2
    81 m .If beam = 0.125 length = 2.5 x draught ,find (1) length of ship (2) prismatic coefficient.
    (120m, 0.8888)
    given; W=8856 tons, Cb=0.8, Am=81 m2, B=0.125L=2.5d
    to find; L=?,Cp=?
    0.125L
    Working; B=0.125L, d= =0.05L
    2.5
    W = s.L.B.d.Cb
    8856
    Lx0.125Lx0.05L =
    1.025 x 0.8
    L = 3 1728000 = 120 m --------Ans.1
    d = 0.05x120 = 6 m, B=0.125x120=15 m
    Am =B.d.Cm
    Am 81
    Cm = = = 0.9
    B.d 15 x 6
    Cb 0.8
    Cp = = = 0.8889 ----------Ans.2
    Cm 0.9

    06. A ship displacement 9450 ton and has a block coefficient of 0.7 the area of immersed midship
    section is 106 m2.If a beam = 0.13 x length = 2.1 x draught , calculate length of the ship and the
    prismatic coefficient.(117.8455 m, 0.7381 )
    07. A ship having displacement 13120 ton has beam (B) = 0.125 L = 4d with block coefficient 0.8. If

    midship area is 85 m2.Find (1) L = ? (2) Prismatic coefficient.


    08. A ship 120m long, 17m beam and 7.2 m draught has a block coefficient 0f 0.76. A parallel section
    6m long is added to the ship a midships. The midship sectional area coefficient is 0.96. Find the new
    displacement and block coefficient.
    6m
    17m
    120m

    7.2m

    Given; L1= 120m, B=17m, d=7.2m, Cb=0.76,Cm=0.96


    To find; WT=? , Cb=?
    Working; W1 = .L1.B.d.Cb
    W1 = 1.025x120x17x7.2x0.76= 11441.952 ton
    W2 = .L2.B.d.Cm
    W2 = 1.025x6x17x7.2x0.96 = 722.6496 ton
    New displacement(WT) = W1 + W2 = 11441.952+722.6496 = 12164.6016 ton------Ans
    LT = 120 + 6 = 126 m
    WT = .LT.B.d. Cb
    WT 12164.6016
    Cb= = = 0.7695 -------Ans
    .LT .B.d 1.025 x126 x17 x 7.2

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