Vassilopoulos and Mandel 



0.6 



+150 

 + 100 

 + 50 S 



bJ 

 CC 



^ 



Q 



-50^ 



W 



-100 

 -150 



0.9 



1.2 

 X/L 



1.5 



Fig. 29 - Model D in directly ahead seas, pitching 

 non-dimensional amplitude and phase angle vs 

 wavelength to shiplength ratio 



286 



