Exam Question

A ship 100 m long floats at a draft of 6m and in this condition the immersed cross sectional areas are as given in tables below. The equivalent base area (Ab) is required because of the fineness of the bottom shell

Section: AP 1 2 3 4 5 6 FP

Immeresed cross section area (m2): 12 30 65 80 70 50 0

Draft(m): 0 0.6 1.2 2.4 3.6 4.8 6.0

Waterplane area (m2): Ab 560 720 880 940 1000 1030

Calculate each of the following:

(a) The equivalent base are value Ab

(b) The longitudinal position of the centre of buoyancy from midship

(c) The vertical position of the centre of buoyancy above the base