Sarat rata2 Sejati (True Mean draft =TMD)

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1 Sarat rata2 Sejati (True Mean draft =TMD)
Apabila trim = 0 atau ‘even keel’ maka sarat kapal depan (F), tengah (M), dan belakang (A) sama besar (tanpa hogging dan sagging) Titik putar membujur kapal disebut c.o.f (center of floatation) yang letaknya tidak selalu di tengah-tengah kapal  titik F Pada contoh di bawah, c.o.f (F) letaknya di belakang tengah-tengah kapal (amidships  YK) Trim = 0  True Mean Draft (TMD) = ½ x (F + A) L F Y Y Z K Designed by: Capt. Hadi Supriyono,Sp1,MM Dedicated to PIP Makassar

2 TMD (continued…) L Y Y F X F A K Z
FZ (sarat kapal pada c.o.f) = YK (sarat kapal pada amidships)  pada keadaan “even keel” = ½ x (sarat depan + sarat belakang) A = sarat belakang; F =sarat depan; t = trim XY/FY = t/L  XY = Koreksi sarat = (t x FY)/L TMD (true mean draft) = sarat rata2 sejati = KX = KY – Koreksi Rumus:  KY = ½ x (F + A) Bila c.o.f berada di depan Y( ): trim by the stern  TMD = KY + Koreksi Trim by the head  TMD = KY - Koreksi Bila c.o.f berada di belakang Y ( ): Trim by the stern  TMD = KY - Koreksi Trim by the Head  TMD = KY + Koreksi L F Y Z K t Y X F A Designed by: Capt. Hadi Supriyono, Sp1, MM Dedicated to: PIP Makassar

3 c.o.f didepan amidship, trim by the stern: TMD = KX = KY + koreksi
Penjelasan rumus c.o.f didepan amidship, trim by the stern: TMD = KX = KY + koreksi L t X Y Y F Z F A K Designed by: Capt. Hadi Supriyono, Sp1, MM Dedicated to: PIP Makassar