This document discusses key ship measurements and dimensions. It defines terms like LOA, LWL, LBP, draft, beam, depth, displacement, and various coefficient metrics used to characterize a ship's shape such as block coefficient. The document is a lecture on basic ship dimensions and was presented by Adi Wirawan Husodo in 2012. Key dimensions discussed include length, width, depth, draft locations, and coefficients used to quantify properties like waterplane area and midship section.

1. © Adi Wirawan Husodo
2012
Kuliah-3 Teori Bangunan Kapal
Ukuran Utama Kapal
Dosen : Adi Wirawan Husodo, ST, MT
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2012
Bagaimana menunjukkan ukuran kapal
tsb ????

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2012
UKURAN UTAMA
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MAIN DIMENSIONS
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PRINSIPAL DIMENSIONS
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MAIN PARTICULARS
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PRINCIPAL PARTICULARS
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4. © Adi Wirawan Husodo
2012
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2012
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2012

7. © Adi Wirawan Husodo
2012
Ukuran Utama
• LOA = Length Overall
panjang yang diukur dari ujung haluan (bow/stem) sampai dengan
ujung buritan (stern).
• LWL = Length on waterline
panjang antara dua garis air muat (load water line); yang diukur dari
perpotongan WL dengan linggi buritan (stern post ) sampai dengan
perpotongan antara WL dengan linggi haluan (stem post), tidak
termasuk ketebalan pelat kulit (shell plate)

8. © Adi Wirawan Husodo
2012
Ukuran Utama
• LBP / LPP = Length between perpendicular
panjang antara dua garis tegak; garis tegak haluan (FP=fore/forward
perpendicular), dan garis tegak buritan (AP=aft/after perpendicular).
• FP = fore / forward perpendicular
garis tegak haluan yang diperoleh dari perpotongan antara linggi
haluan dengan garis air muat

9. © Adi Wirawan Husodo
2012
Ukuran Utama
• AP = after /aft perpendicular
garis tegak buritan yang diperoleh pada sisi belakang linggi kemudi
(rudder post) ATAU diambil tegak lurus pada sumbu kemudi (rudder
stock).
• Amidship / Midship
Pertengahan kapal, setengah dari LPP/LBP

10. © Adi Wirawan Husodo
2012
Ukuran Utama
• Base Line; garis horisontal
yang digambarkan pada bagian
atas (top) dari lunas (keel)
kapal.
• Draft (T)/(D) = sarat kapal
Garis tegak lurus vertikal yang
diukur dari lunas kapal sampai
garis air muat.
• Mean draft;
Sarat rata-rata dari sarat depan
(Tf) dan sarat buritan (Ta). Mean
draft terletak pada amidship.
Sarat haluan (Tf) terletak di
FP, dan Sarat buritan (Ta)
terletak di AP.

11. © Adi Wirawan Husodo
2012
Ukuran Utama
• Bow draft (Tf)
• Stern Draft (Ta)
• Ta > Tf ; trim by stern (Trim buritan)
• Tf > Ta ; trim by bow (Trim haluan)
– Increase the ship’s resistance and could make the propeller out to the
water surface.

12. © Adi Wirawan Husodo
2012
Ukuran Utama
• Depth (D)
Jarak tegak lurus yang diukur
dari lunas (keel) sampai
dengan sisi terendah pelat
geladak pada sisi kapal.
• Beam (B):
Lebar horisontal dari masing-
masing frame section.
• Breadth (B):
Lebar maksimum kapal yang
diukur pada bagian tengah
kapal (amidship).

13. © Adi Wirawan Husodo
2012
Ukuran Utama
• Freeboard:
Jarak vertikal yang diukur
pada sisi kapal antara garis air
muat sampai freeboard deck.
Perbedaan antara sarat
kapal dan tinggi kapal (T dan
H)
• Freeboard deck
Umumnya berupa geladak
yang langsung terkena cuaca
(weather exposed);

14. © Adi Wirawan Husodo
2012
Displacement ()
• When a ship in loaded condition floats at an arbitrary water line, its
displacement is equal to the relevant mass of water displaced by the
ship. Displacement is thus equal to the total weight, all told, of the relevant
loaded ship, normally in sea water with a mass density of 1.025 t/m3.
• Displacement comprises the ship’s light weight and its
deadweight, where the deadweight is equal to the ship’s loaded
capacity, including bunkers and other supplies necessary for the ship’s
propulsion. The deadweight at any time thus represents the difference
between the actual displacement and the ship’s light weight, all given in
tons:
deadweight (DWT) = displacement () – light weight (LWT)

15. © Adi Wirawan Husodo
2012
Displacement ()
 g

16. © Adi Wirawan Husodo
2012
Koefisien Bentuk Kapal
• Koefisien Bidang Garis Air (Cw = water plane area coeff.)
• Koefisien Midship (Cm = Midship Section Coeff.)
• Koefisien Blok (Cb = Block Coeff.)
• Koefisien Prismatik (Cp = Prismatic Coeff.)
• Koefisien Prismatik Tegak (Cpv = Vertical Prismatic Coeff.)

17. © Adi Wirawan Husodo
2012
Koefisien Bentuk Kapal

18. © Adi Wirawan Husodo
2012
Koefisien Bidang Garis Air
(Cw = water plane area coeff.)
• The coefficient of fineness of the water-plane area is the ratio of the
area of the water-plane to the area of a rectangle having the same
length and maximum breadth.

19. © Adi Wirawan Husodo
2012
Koefisien Midship
(Cm = Midship Section Coeff.)
• The midships coefficient to any draft is the ratio of the transverse
area of the midships Section (Am) to a rectangle having the same
breadth and draft.

20. © Adi Wirawan Husodo
2012
Koefisien Blok (Cb = Block Coeff.)
• The block coefficient of a ship at any particular draft is
the ratio of the volume of displacement at that draft to
the volume of a rectangular block having the same
overall length, breadth, and draft.

21. © Adi Wirawan Husodo
2012
Koefisien Prismatik
(Cp = Prismatic Coeff.)
• The prismatic coefficient of a ship at any draft is the ratio of the
volume of displacement at that draft to the volume of a prism having
the same length as the ship and the same cross-sectional area as
the ship's midships area.
• The prismatic coefficient is used mostly by ship-model researchers.

22. © Adi Wirawan Husodo
2012
Koefisien Prismatik Tegak
(Cpv = Vertical Prismatic Coeff.)
• Ratio of the volume of displacement to the volume of prism having a
length equal to the draft and a cross-sectional area equal to the
water plane area

23. © Adi Wirawan Husodo
2012
TERIMA KASIH
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