For the convenience of estimation for the hull steel weights of cargo ships in the early stage of design, it is necessary for us to put the measured datas of actual ships in order, by means of a graphical form which is expressed by a functional relation between the principal dimensions (L, B, D) and the hull steel weight (W).
In order to get the rational relation, the writer calculated the qualitative weights for 41 ships of 3 Islander's type, varying the principal dimensions systematically.
And these results were analized as following sequence.
(1) Relations betweenWandL, BandD
(2) _??_ _??_ W/L(B+D) andL, BandD
(3) _??_ _??_ WandL×B×D
(4) _??_ _??_ Wand block coefficient, length of erection and frame space.
And then it was found that the hull steel weight may be expressed simply in the form :
W=w×L(B+D)
where w is a linear function of L, and the cargo ship's datas were platted graphically in Fig. (10).