Vassilopoulos and Mandel 



1.5 

 1.4 

 1.2 

 1.0 

 i°0.8|- 

 0.6 

 0.4 

 0.2 

 00 



0.6 0.9 



+150 



+ 100 



+ 5oS 



iij 



cc 



^ 



o 



50* 



00 



50 



1.2 

 X/L 



Fig. 15 - Model B in directly astern seas, heaving 

 non-dinnensional annplitude and phase angle vs 

 wavelength to shiplength ratio 



272 



