

































Wave Length: 360 ft. 

























*^— 





















^*v 



-^ 



















^— — 



— ^.^ 









































s 



V 











As 







*^^ 











Wave Length : 480 ft. 



— ■-» 



"~ 



































15 20 5 



Ship Speed in knots 



10 



20 



0.35 

 030 

 0.25 

 0.20 

 0.15 

 0.10 

 0.05 





 0.30 

 0.25 



020 

 0.15 

 0.10 

 0.05 



5 10 15 



Ship Speed in knots 



Figure 8 — Experimental Pitch Amplitudes As a Function of Wave Height 



HEAVE (Figure 9) 



Heave amplitudes shown are experimental. Linearity of heave with wave height at 

 constant speed and wave length was found to hold within the wave-height range of the tests, 

 as in the case of pitch. The data are presented in graphical form, showing the amplitude of 

 heave per unit of wave height measured from trough to crest. Heave amplitudes for wave 

 lengths not included in the direct presentation can be obtained by graphical interpolation. 



PHASE LAG OF HEAVE REFERRED TO PITCH (Figure 10) 



Values of phase lag of heave referred to pitch were determined directly from the exper- 

 imental data. The variations in phase lag with wave height at constant speed and wave length 

 remained within the estimated accuracy of record interpretation. It was then assumed that for 

 this model the wave height had no effect on the phase relation between heave and pitch. 

 Phase values for wave lengths not included in the direct presentation can be obtained by 

 graphical interpolation. 















































"*""■ 



--^. 





Wave Length = 600 ft. 









































i 





i 







1 



5 



20 



12 



