and 



Marsich and Merega 



" - ;. K, = f (R) 



Figures 7 and 8 show the curves having K^ = constant, while in Fig. 9 

 the curve K2 = f (R) is drawn. 



These diagrams may be utilized for determining c^ by means of simple 

 linear interpolations, avoiding the numerical evaluation of the above formula, 

 and we hope they may be of some help to the ship designer. 



1.5 Examples of Formula Application to Existing Ships 



As an example the comparison between the results from the above formula 

 and from a direct calculation according to the KK method is given in Table 4 

 for nine ships having typical characteristics of oil tankers and bulk carriers. 



The differences found for these ships are representative of a large set of 

 ships calculated to check the validity of the formula. 



Table 4 

 Comparison of Formula and KK Method (w = 60 knots; Fr = 0.05) 



2. THE RESEARCH METHOD 

 2.1 General 



In the first part of this paper, the results have been exposed of an investiga- 

 tion on the wave bending moment in confused sea. The aim of the second part is to 

 explain the procedure followed during the investigation, so that the readers have 

 the possibility of appraising the reliability of the obtained results. To this pur- 

 pose it is necessary that some considerations be premised about selected hulls 

 and weight distribution diagrams adopted for calculation. 



830 



