Figure 15 - Variation of Pitch 

 Parameters with L/V^^^ 



Figure 16 — Variation of Pitch 

 Parameters with L/SJ^^'^ 



characteristic parameter instead of the mean beam-draft ratio. The parameter L/V^^^ where 

 V is the volume of displacement, is used in Figures 14 through 16 to show the variations in 

 pitch amplitudes among the five models. As in the case of heave, the curves are plotted 

 for constant Froude numbers and tuning factors. The results indicate that ships having low 

 values of L/V^/^ have larger pitch parameters than those with high values for L/W '^. 



DISCUSSION 



HEAVE AMPLITUDES 



The curves given in Figures 11 through 13 indicate that an excellent correlation exists 

 between the mean beam-draft ratios of various forms and the corresponding heave parameters. 

 The choice of the parameter C^B/C^H was based on the results of a heave damping calcula- 

 tion which is described below. 



The usual procedure for calculating the heave damping of ships is to compute the damp- 

 ing contributions of each individual section and integrate the results over the ship length to 



12 



