Vassilopoulos and Mandel 



1.6 



1.4 



1.2 



1.0 

 Zo 

 ho 



0.6 

 0.4 

 0.2 

 0.0 



— OP 



0.6 



0.9 



Fig. 7 - Model A in directly astern seas, heaving 

 non-dimensional amplitude and phase angle vs 

 wavelength to shiplength ratio 



264 



