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 hadi_sp2003@yahoo.com Designed by: Capt. Hadi Supriyono,Sp1,MM Dedicated to PIP Makassar
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 hadi_sp2003@yahoo.com Designed by: Capt. Hadi Supriyono, Sp1, MM Dedicated to: PIP Makassar
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 hadi_sp2003@yahoo.com Designed by: Capt. Hadi Supriyono, Sp1, MM Dedicated to: PIP Makassar